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The PHLPP2 phosphatase is a druggable driver of prostate cancer progression

Identifieur interne : 000650 ( Pmc/Corpus ); précédent : 000649; suivant : 000651

The PHLPP2 phosphatase is a druggable driver of prostate cancer progression

Auteurs : Dawid G. Nowak ; Ksenya Cohen Katsenelson ; Kaitlin E. Watrud ; Muhan Chen ; Grinu Mathew ; Vincent D. D Ndrea ; Matthew F. Lee ; Manojit Mosur Swamynathan ; Irene Casanova-Salas ; Megan C. Jibilian ; Caroline L. Buckholtz ; Alexandra J. Ambrico ; Chun-Hao Pan ; John E. Wilkinson ; Alexandra C. Newton ; Lloyd C. Trotman

Source :

RBID : PMC:6548123

Abstract

Nowak et al. show that loss of the AKT-inactivating phosphatase PHLPP2 paradoxically blocks prostate tumor growth and metastasis. PHLPP2, they find, is critical for MYC stability, suggesting that PHLPP2 inhibitors may present a therapeutic opportunity to target MYC.


Url:
DOI: 10.1083/jcb.201902048
PubMed: 31092557
PubMed Central: 6548123

Links to Exploration step

PMC:6548123

Le document en format XML

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<div type="abstract" xml:lang="en">
<p>Nowak et al. show that loss of the AKT-inactivating phosphatase PHLPP2 paradoxically blocks prostate tumor growth and metastasis. PHLPP2, they find, is critical for MYC stability, suggesting that PHLPP2 inhibitors may present a therapeutic opportunity to target MYC.</p>
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<author>
<name sortKey="Shi, J" uniqKey="Shi J">J. Shi</name>
</author>
<author>
<name sortKey="Wang, E" uniqKey="Wang E">E. Wang</name>
</author>
<author>
<name sortKey="Rappaport, A R" uniqKey="Rappaport A">A.R. Rappaport</name>
</author>
<author>
<name sortKey="Herrmann, H" uniqKey="Herrmann H">H. Herrmann</name>
</author>
<author>
<name sortKey="Sison, E A" uniqKey="Sison E">E.A. Sison</name>
</author>
<author>
<name sortKey="Magoon, D" uniqKey="Magoon D">D. Magoon</name>
</author>
<author>
<name sortKey="Qi, J" uniqKey="Qi J">J. Qi</name>
</author>
<author>
<name sortKey="Blatt, K" uniqKey="Blatt K">K. Blatt</name>
</author>
<author>
<name sortKey="Wunderlich, M" uniqKey="Wunderlich M">M. Wunderlich</name>
</author>
</analytic>
</biblStruct>
</listBibl>
</div1>
</back>
</TEI>
<pmc article-type="research-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">J Cell Biol</journal-id>
<journal-id journal-id-type="iso-abbrev">J. Cell Biol</journal-id>
<journal-id journal-id-type="publisher-id">jcb</journal-id>
<journal-id journal-id-type="hwp">jcb</journal-id>
<journal-title-group>
<journal-title>The Journal of Cell Biology</journal-title>
</journal-title-group>
<issn pub-type="ppub">0021-9525</issn>
<issn pub-type="epub">1540-8140</issn>
<publisher>
<publisher-name>Rockefeller University Press</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">31092557</article-id>
<article-id pub-id-type="pmc">6548123</article-id>
<article-id pub-id-type="publisher-id">201902048</article-id>
<article-id pub-id-type="doi">10.1083/jcb.201902048</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Research Articles</subject>
<subj-group>
<subject>Article</subject>
</subj-group>
</subj-group>
<subj-group subj-group-type="hwp-journal-coll">
<subject>23</subject>
<subject>37</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>The PHLPP2 phosphatase is a druggable driver of prostate cancer progression</article-title>
<alt-title alt-title-type="short">PHLPP2 promotes prostate cancer progression</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Nowak</surname>
<given-names>Dawid G.</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
<xref ref-type="aff" rid="aff2">2</xref>
<xref ref-type="corresp" rid="cor6"></xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Katsenelson</surname>
<given-names>Ksenya Cohen</given-names>
</name>
<xref ref-type="aff" rid="aff3">3</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Watrud</surname>
<given-names>Kaitlin E.</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Chen</surname>
<given-names>Muhan</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Mathew</surname>
<given-names>Grinu</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>D’Andrea</surname>
<given-names>Vincent D.</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">http://orcid.org/0000-0002-5110-6601</contrib-id>
<name>
<surname>Lee</surname>
<given-names>Matthew F.</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Swamynathan</surname>
<given-names>Manojit Mosur</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Casanova-Salas</surname>
<given-names>Irene</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Jibilian</surname>
<given-names>Megan C.</given-names>
</name>
<xref ref-type="aff" rid="aff2">2</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Buckholtz</surname>
<given-names>Caroline L.</given-names>
</name>
<xref ref-type="aff" rid="aff2">2</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">http://orcid.org/0000-0001-6372-1057</contrib-id>
<name>
<surname>Ambrico</surname>
<given-names>Alexandra J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">http://orcid.org/0000-0002-0776-9408</contrib-id>
<name>
<surname>Pan</surname>
<given-names>Chun-Hao</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wilkinson</surname>
<given-names>John E.</given-names>
</name>
<xref ref-type="aff" rid="aff4">4</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Newton</surname>
<given-names>Alexandra C.</given-names>
</name>
<xref ref-type="aff" rid="aff3">3</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">http://orcid.org/0000-0002-4794-1559</contrib-id>
<name>
<surname>Trotman</surname>
<given-names>Lloyd C.</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
<xref ref-type="corresp" rid="cor5"></xref>
</contrib>
</contrib-group>
<aff id="aff1">
<label>1</label>
<institution>Cold Spring Harbor Laboratory, Cold Spring Harbor, NY</institution>
</aff>
<aff id="aff2">
<label>2</label>
<institution>Division of Hematology and Medical Oncology, Department of Medicine, Meyer Cancer Center, Weill Cornell Medicine, New York, NY</institution>
</aff>
<aff id="aff3">
<label>3</label>
<institution>Department of Pharmacology, University of California San Diego, La Jolla, CA</institution>
</aff>
<aff id="aff4">
<label>4</label>
<institution>Department of Pathology, University of Michigan, Ann Arbor, MI</institution>
</aff>
<author-notes>
<corresp id="cor5">Correspondence to Lloyd C. Trotman:
<email>trotman@cshl.edu</email>
</corresp>
<corresp id="cor6">Dawid G. Nowak:
<email>dgn2001@med.cornell.edu</email>
</corresp>
</author-notes>
<pub-date pub-type="ppub">
<day>28</day>
<month>6</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>5</month>
<year>2019</year>
</pub-date>
<volume>218</volume>
<issue>6</issue>
<fpage>1943</fpage>
<lpage>1957</lpage>
<history>
<date date-type="received">
<day>11</day>
<month>2</month>
<year>2019</year>
</date>
<date date-type="rev-recd">
<day>21</day>
<month>3</month>
<year>2019</year>
</date>
<date date-type="accepted">
<day>29</day>
<month>3</month>
<year>2019</year>
</date>
</history>
<permissions>
<copyright-statement>© 2019 Nowak et al.</copyright-statement>
<copyright-year>2019</copyright-year>
<ali:free_to_read start_date="2019-12-01"></ali:free_to_read>
<license>
<ali:license_ref specific-use="vor">http://www.rupress.org/terms/</ali:license_ref>
<ali:license_ref specific-use="vor" start_date="2019-12-01">https://creativecommons.org/licenses/by-nc-sa/4.0/</ali:license_ref>
<license-p>This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see
<ext-link ext-link-type="uri" xlink:href="http://www.rupress.org/terms/">http://www.rupress.org/terms/</ext-link>
). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 International license, as described at
<ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by-nc-sa/4.0/">https://creativecommons.org/licenses/by-nc-sa/4.0/</ext-link>
).</license-p>
</license>
</permissions>
<self-uri xlink:role="icon" xlink:href="JCB_201902048_thumb.gif"></self-uri>
<abstract abstract-type="precis">
<p>Nowak et al. show that loss of the AKT-inactivating phosphatase PHLPP2 paradoxically blocks prostate tumor growth and metastasis. PHLPP2, they find, is critical for MYC stability, suggesting that PHLPP2 inhibitors may present a therapeutic opportunity to target MYC.</p>
</abstract>
<abstract>
<p>Metastatic prostate cancer commonly presents with targeted, bi-allelic mutations of the
<italic>PTEN</italic>
and
<italic>TP53</italic>
tumor suppressor genes. In contrast, however, most candidate tumor suppressors are part of large recurrent hemizygous deletions, such as the common chromosome 16q deletion, which involves the AKT-suppressing phosphatase PHLPP2. Using RapidCaP, a genetically engineered mouse model of
<italic>Pten/Trp53</italic>
mutant metastatic prostate cancer, we found that complete loss of
<italic>Phlpp2</italic>
paradoxically blocks prostate tumor growth and disease progression. Surprisingly, we find that Phlpp2 is essential for supporting Myc, a key driver of lethal prostate cancer. Phlpp2 dephosphorylates threonine-58 of Myc, which renders it a limiting positive regulator of Myc stability. Furthermore, we show that small-molecule inhibitors of PHLPP2 can suppress MYC and kill
<italic>PTEN</italic>
mutant cells. Our findings reveal that the frequent hemizygous deletions on chromosome 16q present a druggable vulnerability for targeting MYC protein through PHLPP2 phosphatase inhibitors.</p>
</abstract>
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<award-group id="sp1">
<funding-source>
<institution-wrap>
<institution>Pershing Square Sohn Foundation</institution>
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</institution-wrap>
</funding-source>
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<funding-source>
<institution-wrap>
<institution>National Institutes of Health</institution>
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</institution-wrap>
</funding-source>
<award-id rid="sp2">R01 CA137050</award-id>
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<institution>Pershing Square Sohn Cancer Research Alliance</institution>
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</institution-wrap>
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<funding-source>
<institution-wrap>
<institution>American Cancer Society</institution>
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</funding-source>
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</institution-wrap>
</funding-source>
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</institution-wrap>
</funding-source>
<award-id rid="sp7">P50 CA211024</award-id>
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<funding-source>Robertson Research Fund</funding-source>
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<institution-wrap>
<institution>National Institutes of Health</institution>
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</front>
<body>
<sec sec-type="introduction" id="s01">
<title>Introduction</title>
<p>Prostate cancer (PC) is one of the most prevalent cancers among men, causing almost 30,000 deaths in the United States alone. Death is mainly due to metastasis, as the 5-yr survival rate of metastatic PC is only 28%. In contrast, the 5-yr survival rate of organ-confined disease is almost 99% (
<xref rid="bib40" ref-type="bibr">National Cancer Institute, 2016</xref>
). Understanding how genetic alterations are linked to cancer progression can help explain how tumor cells escape from focal disease sites to distant metastatic sites. However, there is a scarcity of human prostate metastatic samples for research purposes because invasive biopsies at metastatic sites can be dangerous and offer uncertain clinical benefit to patients.</p>
<p>Large-scale genomics efforts on both primary and metastatic PC have transformed our basic understanding of the genetics behind patient progression to metastatic disease. Two major lessons learned from these collaborative studies can be summarized as follows. First, PC has a low DNA missense mutation rate (
<xref rid="bib33" ref-type="bibr">Lawrence et al., 2013</xref>
), resulting in only a few recurrent mutations (
<xref rid="bib2" ref-type="bibr">Barbieri et al., 2012</xref>
) that show no increase in metastatic sample analysis (
<xref rid="bib46" ref-type="bibr">Robinson et al., 2015</xref>
). In contrast, DNA repair–associated mutations may offer new therapeutic opportunities (
<xref rid="bib23" ref-type="bibr">Grasso et al., 2012</xref>
;
<xref rid="bib6" ref-type="bibr">Cancer Genome Atlas Research Network, 2015</xref>
;
<xref rid="bib36" ref-type="bibr">Mateo et al., 2015</xref>
,
<xref rid="bib37" ref-type="bibr">2017</xref>
), but at this point they cannot help to identify the bulk of men who are at risk of progression. Second, metastatic patient samples reveal a sharp increase in the number of recurrent DNA copy number alterations (CNAs). These cover known drivers of disease, including
<italic>PTEN</italic>
,
<italic>TP53</italic>
,
<italic>MYC</italic>
,
<italic>RB1</italic>
, and amplification of
<italic>AR</italic>
, which is induced by hormone ablation therapy (
<xref rid="bib53" ref-type="bibr">Taylor et al., 2010</xref>
;
<xref rid="bib6" ref-type="bibr">Cancer Genome Atlas Research Network, 2015</xref>
;
<xref rid="bib46" ref-type="bibr">Robinson et al., 2015</xref>
). However, most regions that suffer recurrent CNAs are still awaiting rigorous validation of the candidate cancer genes that they contain.</p>
<p>We, and others, use genetically engineered mice (GEMs) to functionally test the contribution of individual gene alterations to the disease (
<xref rid="bib27" ref-type="bibr">Irshad and Abate-Shen, 2013</xref>
). Modeling of primary PC has demonstrated the pivotal role of Pten as an essential suppressor of PI 3-kinase/Akt signaling in controlling onset, progression, and outcome of the disease, either alone (
<xref rid="bib43" ref-type="bibr">Podsypanina et al., 1999</xref>
;
<xref rid="bib32" ref-type="bibr">Kwabi-Addo et al., 2001</xref>
;
<xref rid="bib54" ref-type="bibr">Trotman et al., 2003</xref>
) or when combined with other insults (
<xref rid="bib15" ref-type="bibr">Di Cristofano et al., 2001</xref>
;
<xref rid="bib11" ref-type="bibr">Chen et al., 2005</xref>
;
<xref rid="bib55" ref-type="bibr">Trotman et al., 2006</xref>
;
<xref rid="bib16" ref-type="bibr">Ding et al., 2011</xref>
). Of particular relevance to this study, we have previously shown that loss of the phospho-Akt inhibiting
<italic>Phlpp1</italic>
phosphatase triggers prostatic neoplasia on its own, and when combined with hemizygous loss of
<italic>Pten</italic>
results in highly penetrant prostate carcinoma (
<xref rid="bib8" ref-type="bibr">Chen et al., 2011</xref>
). These results were consistent with the notion that the degree of PI 3-kinase/Akt pathway activation dictates disease course (
<xref rid="bib54" ref-type="bibr">Trotman et al., 2003</xref>
), a notion that long served as the blueprint for target therapy of PC (
<xref rid="bib35" ref-type="bibr">Majumder and Sellers, 2005</xref>
).</p>
<p>To now explore the mechanisms behind metastasis, we have recently developed RapidCaP (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
). In this GEM model for analysis and therapy of endogenous metastatic PC, we are using somatic gene transfer to trigger loss of
<italic>Pten</italic>
and
<italic>Trp53</italic>
in prostate, two alterations that have emerged as a hallmark of the human metastatic PC genome (
<xref rid="bib1" ref-type="bibr">Armenia et al., 2018</xref>
). The analysis of primary lesions and visceral metastases revealed a surprise: in contrast to primary PC, suppression of Akt was seen in metastasis (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
;
<xref rid="bib42" ref-type="bibr">Nowak et al., 2015</xref>
). Mechanistically, we showed that inactivation of phospho-Akt was mediated by its phosphatase, Phlpp2, consistent with high Phlpp2 expression in the phospho-Akt–negative metastatic lesions from multiple histological sites (
<xref rid="bib42" ref-type="bibr">Nowak et al., 2015</xref>
).</p>
<p>PHLPP2 and the closely related paralog PHLPP1 are members of the protein phosphatase 2C (PP2C) family of Mg
<sup>2+</sup>
/Mn
<sup>2+</sup>
-dependent phosphatases, which are insensitive to most common phosphatase inhibitors, including okadaic acid (OA;
<xref rid="bib5" ref-type="bibr">Brognard et al., 2007</xref>
). They can inactivate signaling of their targets AKT and PKC by dephosphorylation of the C-terminal hydrophobic phosphorylation motifs (
<xref rid="bib4" ref-type="bibr">Brognard and Newton, 2008</xref>
;
<xref rid="bib21" ref-type="bibr">Gao et al., 2008</xref>
).</p>
<p>Since
<italic>Phlpp1</italic>
loss triggers PC initiation by activation of Akt (
<xref rid="bib8" ref-type="bibr">Chen et al., 2011</xref>
), but in metastasis we found that Akt is suppressed by a mechanism that requires Phlpp2, it has become unclear if Phlpp2 promotes or prevents the disease. Human PC genomics does not provide strong clues, as
<italic>PHLPP2</italic>
is part of a recurrent broad hemizygous deletion in primary and metastatic disease. Therefore, we used genetics to directly test the role of
<italic>Phlpp2</italic>
in vivo using the RapidCaP system as done previously for other candidate cancer genes (
<xref rid="bib13" ref-type="bibr">Cho et al., 2015</xref>
;
<xref rid="bib9" ref-type="bibr">Chen et al., 2017</xref>
). Our results show that despite its ability to suppress Akt kinase,
<italic>Phlpp2</italic>
is required for PC and its progression because it can dephosphorylate and stabilize the Myc oncogene. The frequent hemizygous
<italic>PHLPP2</italic>
deletions therefore make it an attractive drug target.</p>
</sec>
<sec sec-type="results" id="s02">
<title>Results</title>
<sec id="s03">
<title>PHLPP2 maintains MYC levels and cell proliferation</title>
<p>To dissect mechanistic connections between genes of interest, we first used in vitro recombination of mouse-derived primary cells, as published recently (
<xref rid="bib42" ref-type="bibr">Nowak et al., 2015</xref>
). This approach allows us to dissect immediate mechanistic consequences of gene deactivation(s) from adaptive long-term responses in tissue culture (
<xref ref-type="fig" rid="fig1">Fig. 1, A and B</xref>
; and Fig. S1 A).
<italic>Pten</italic>
/
<italic>Trp53</italic>
co-deletion results in increased levels of total Myc and Phlpp2, consistent with our previously published results (
<xref rid="bib42" ref-type="bibr">Nowak et al., 2015</xref>
;
<xref ref-type="fig" rid="fig1">Fig. 1 A</xref>
and Fig. S1 B). In contrast to Phlpp2, Phlpp1 was not increased in the
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
double mutants relative to the
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
single mutant, a consistent observation that was in line with our earlier findings suggesting that cells modulate Phlpp2 rather than Phlpp1 to compensate for
<italic>Pten</italic>
loss (
<xref ref-type="fig" rid="fig1">Fig. 1 A</xref>
;
<xref rid="bib8" ref-type="bibr">Chen et al., 2011</xref>
).</p>
<fig id="fig1" fig-type="figure" orientation="portrait" position="float">
<label>Figure 1.</label>
<caption>
<p>
<bold>Deletion of
<italic>Phlpp2</italic>
suppresses proliferation of primary and cancer cells. (A)</bold>
Analysis of signaling pathways by Western blot analysis of cell lysates from different genotypes of primary MEFs.
<bold>(B)</bold>
Loss of the
<italic>Phlpp2</italic>
gene causes primary MEFs to proliferate less aggressively when compared with the
<italic>Pten/Trp53</italic>
-null cells (left panel). Error bars, SD;
<italic>n</italic>
≥ 3; *, P < 0.05 with Student’s
<italic>t</italic>
test at days 4 and 6. Combined loss of the
<italic>Pten/Trp53/Phlpp2</italic>
genes decreases expression of Myc and increases p16 expression (right panel).
<bold>(C)</bold>
Western blot analysis confirms efficient knockout of
<italic>Phlpp2</italic>
with the CRISPR/Cas9 system and a decrease in activation of Myc expression (left upper panel, lines indicate splicing of two irrelevant lanes). Guide 1 anti-
<italic>Phlpp2 (</italic>
g.1) suppresses proliferation of
<italic>Pten/Trp53</italic>
–negative cells (right panel). Overexpression of PHLPP2 leads to increased Myc expression (lower left panel). Error bars, SD;
<italic>n</italic>
≥ 3; *, P < 0.05 with Student’s
<italic>t</italic>
test at days 2, 4, and 6.
<bold>(D)</bold>
Western blot analysis confirms knockdown of PHLPP2 in DU145-human PC cells with siRNA (left panel), reaching almost 75% efficiency after 72 h, as quantified by densitometric analysis (right panel). Error bars, SD;
<italic>n =</italic>
2; *, P < 0.05 with Student’s
<italic>t</italic>
test.
<bold>(E)</bold>
Western blot analysis confirms knockdown of PHLPP2 in PC3 human PC cells with siRNA (left panel), reaching almost 40% efficiency after 72 h, as quantified by densitometric analysis (right panel). Error bars, SD;
<italic>n =</italic>
2; *, P < 0.05 with Student’s
<italic>t</italic>
test.
<bold>(F)</bold>
Western blot analysis shows knockdown of PHLPP2 in DU145 cells with two different guides (left panel). Depletion of the
<italic>PHLPP2</italic>
mutant cells as seen by depletion of Venus-positive cells compared with g.Ren.Ctrl, normalized at day 4. Error bars, SD;
<italic>n =</italic>
4; ANOVA, Dunnett’s post hoc test; P < 0.05 versus g.Ren.Ctrl at each respective day. wt, wild-type.</p>
</caption>
<graphic xlink:href="JCB_201902048_Fig1"></graphic>
</fig>
<p>To assess the impact of
<italic>Phlpp2</italic>
loss in double-mutant cells, we generated and tested triple-mutant
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
mouse embryonic fibroblasts (MEFs). First, we noted a significant drop in proliferation of these cells compared with the double-mutant
<italic>Pten</italic>
<sup>Δ/Δ</sup>
<italic>;Trp53</italic>
<sup>Δ/Δ</sup>
cells (
<xref ref-type="fig" rid="fig1">Fig. 1 B</xref>
, left panel). Protein analysis revealed increases in Akt activation upon
<italic>Phlpp2</italic>
loss, as expected. To our surprise, however, we found that loss of
<italic>Phlpp2</italic>
caused a sharp reduction in the total levels of Myc (
<xref ref-type="fig" rid="fig1">Fig. 1 B</xref>
, right panel). MYC is a driver oncogene of many cancer types, including human PC and classic GEMs of the disease (
<xref rid="bib18" ref-type="bibr">Ellwood-Yen et al., 2003</xref>
;
<xref rid="bib19" ref-type="bibr">Farrell and Sears, 2014</xref>
;
<xref rid="bib38" ref-type="bibr">McKeown and Bradner, 2014</xref>
;
<xref rid="bib20" ref-type="bibr">Fernandez-Salas et al., 2016</xref>
). Notably, we found that Myc is a spontaneously activated, essential driver of metastasis and resistance to castration therapy in RapidCaP (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
;
<xref rid="bib42" ref-type="bibr">Nowak et al., 2015</xref>
). Activation of the p16 tumor suppressor was also seen in these cells (
<xref ref-type="fig" rid="fig1">Fig. 1 B</xref>
, right panel), a response that can be overcome by Myc to cause immortalization (
<xref rid="bib22" ref-type="bibr">Gil et al., 2005</xref>
). In addition,
<italic>Phlpp2</italic>
loss did not affect levels of Phlpp1, showing lack of general compensation between these two proteins (
<xref ref-type="fig" rid="fig1">Fig. 1 B</xref>
, right panel).</p>
<p>To explore the result on MYC suppression in more depth, we next turned from simultaneous deletion of the three cancer genes to spontaneous loss of
<italic>PHLPP2</italic>
in a stable
<italic>PTEN</italic>
/
<italic>TP53</italic>
mutant (cancer) cell background using CRISPR/Cas9 and siRNA. Using the latter approach first in
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
MEFs, we confirmed suppression of Myc upon
<italic>Phlpp2</italic>
knockout together with increased phosphorylation of Akt (
<xref ref-type="fig" rid="fig1">Fig. 1 C</xref>
, upper left panel). Functional analysis of these cells also showed decreased proliferation after
<italic>Phlpp2</italic>
deletion (
<xref ref-type="fig" rid="fig1">Fig. 1 C</xref>
, right panel). Conversely, overexpression of
<italic>PHLPP2</italic>
in the double-mutant cells caused an increase in Myc protein, confirming the notion that PHLPP2 regulates Myc levels (
<xref ref-type="fig" rid="fig1">Fig. 1 C</xref>
, lower left panel). Next, we knocked down
<italic>PHLPP2</italic>
in DU145 cells, a human metastatic PC cell line. As shown in
<xref ref-type="fig" rid="fig1">Fig. 1 D</xref>
(left panel),
<italic>PHLPP2</italic>
siRNA caused an ∼75% reduction in MYC protein, as quantified by densitometric analysis (
<xref ref-type="fig" rid="fig1">Fig. 1 D</xref>
, right panel).
<italic>PHLPP2</italic>
-siRNA knockdown in PC3, another PC metastatic cell line (
<xref ref-type="fig" rid="fig1">Fig. 1 E</xref>
, left panel), also caused a reduction in MYC protein levels (by ∼40%;
<xref ref-type="fig" rid="fig1">Fig. 1 E</xref>
, right panel).</p>
<p>Finally, we tested if genetic targeting of
<italic>PHLPP2</italic>
can be used to deplete DU145 cells upon stable infection with our anti–PHLPP2-CRISPR-Cas9-P2A-VenusFP viral vector system (ECPV;
<xref rid="bib9" ref-type="bibr">Chen et al., 2017</xref>
;
<xref rid="bib50" ref-type="bibr">Senturk et al., 2017</xref>
).
<xref ref-type="fig" rid="fig1">Fig. 1 F</xref>
shows how targeting of
<italic>PHLPP2</italic>
with two different guides efficiently depleted the fluorescence-positive cells relative to the control. In contrast, the nonmetastatic cell line 22Rv1 showed no difference after Phlpp2 targeting (
<xref ref-type="fig" rid="fig1">Fig. 1 F</xref>
and Fig. S1 C). Collectively, our results suggested that PHLPP2 both controls and is required to maintain MYC levels and proliferation of cells, possibly more efficiently in metastatic cell lines.</p>
</sec>
<sec id="s04">
<title>PHLPP2 controls MYC stability</title>
<p>MYC up-regulation in human cancers occurs via a multitude of mechanisms (see Discussion); we observed gene amplification in metastatic and castration-resistant RapidCaP lesions (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
). MYC stability is regulated by an intriguing phosphorylation system involving two conserved residues. Phosphorylation of Serine 62 (S62) by the kinases CDK2 (
<xref rid="bib26" ref-type="bibr">Hydbring et al., 2010</xref>
), extracellular signal–related kinase (ERK;
<xref rid="bib49" ref-type="bibr">Sears et al., 2000</xref>
), or CAMKIIγ (
<xref rid="bib24" ref-type="bibr">Gu et al., 2017</xref>
) increases MYC stability (
<xref ref-type="fig" rid="fig2">Fig. 2 A</xref>
). In contrast, phosphorylation of threonine-58 (T58) by GSK3β triggers dephosphorylation of phospho-S62 by PP2A (
<xref rid="bib60" ref-type="bibr">Yeh et al., 2004</xref>
). This is followed by ubiquitination of MYC by the SCF-Fbw7 E3 ligase and proteasomal degradation (
<xref rid="bib57" ref-type="bibr">Welcker et al., 2004</xref>
). MYC degradation takes place in the nucleolus because, in the nucleoplasm, ubiquitination is counteracted by USP28, an ubiquitin-specific protease. USP28 binds to MYC via an interaction with FBW7α (
<xref rid="bib44" ref-type="bibr">Popov et al., 2007</xref>
). We therefore tested if PHLPP2 affects phosphorylation of MYC and its stability as outlined in
<xref ref-type="fig" rid="fig2">Fig. 2 A</xref>
.</p>
<fig id="fig2" fig-type="figure" orientation="portrait" position="float">
<label>Figure 2.</label>
<caption>
<p>
<bold>
<italic>Phlpp2</italic>
status controls phosphorylation of Myc. (A)</bold>
Scheme representing regulators of MYC protein through T58 and S62 phosphorylation sites. These sites can be phosphorylated by GSK3β and CDK1/ERK/CAMKIIγ, respectively. Note that decreased ratios of T58 to S62 phosphorylation and T58 mutation to non–phospho-mimetic residues (e.g., T58A) are recurrent in human cancer.
<bold>(B)</bold>
<italic>Phlpp2</italic>
knockout in
<italic>Pten</italic>
/
<italic>Trp53</italic>
-null MEFs increases phosphorylation at the T58 site. Lines indicate splicing of three irrelevant lanes.
<bold>(C)</bold>
Overexpression of PHLPP2 leads to decreased T58 phosphorylation.
<bold>(D)</bold>
Treatment of
<italic>Pten</italic>
/
<italic>Trp53</italic>
-null MEFs with OA results in an increase in Myc phosphorylation on S62, but not T58. Total levels of Myc were reduced upon deletion of
<italic>Phlpp2.</italic>
<bold>(E)</bold>
Densitometric analysis shows that the phosphorylation ratio of T58 to S62 is significantly increased in the triple-deleted MEFs. Data are presented as the densitometric measurements of pMyc
<sup>T58</sup>
and Myc
<sup>S62</sup>
normalized to β-actin and then these ratios of pMyc
<sup>T58</sup>
to Myc
<sup>S62</sup>
were used in graph as fold to
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
DMSO. Error bars, SD;
<italic>n =</italic>
5; one-way ANOVA, P values corrected for multicomparison testing using the two-stage linear step-up procedure of Benjamini, Krieger, and Yekutieli, with a false discovery rate at 10%. *, P < 0.05. KO, knockout; ns, not significant.</p>
</caption>
<graphic xlink:href="JCB_201902048_Fig2"></graphic>
</fig>
<p>Deletion of
<italic>Phlpp2</italic>
clearly increased the steady-state phosphorylation of Myc at T58 (
<xref ref-type="fig" rid="fig2">Fig. 2 B</xref>
), and PHLPP2 overexpression led to decreased T58 phosphorylation (
<xref ref-type="fig" rid="fig2">Fig. 2 C</xref>
). OA is an inhibitor of PP2A to which the PP2C-type phosphatases, such as PHLPP2, are insensitive (
<xref rid="bib21" ref-type="bibr">Gao et al., 2008</xref>
). First, we observed that the
<italic>Phlpp2</italic>
knockout boosted T58 phosphorylation, but not that of S62 (
<xref ref-type="fig" rid="fig2">Fig. 2, D and E</xref>
, lane 1 vs. 3). Second,
<italic>Phlpp2</italic>
loss lowered Myc total levels (
<xref ref-type="fig" rid="fig2">Fig. 2 D</xref>
, lane 1 vs. lane 3). Furthermore, we saw that treatment with OA boosts Myc phosphorylation on S62, but not T58 (
<xref ref-type="fig" rid="fig2">Fig. 2, D and E</xref>
; lane 1 vs. lane 2). These results confirmed the previously proposed dominant role of T58 phosphorylation in dictating Myc levels (
<xref rid="bib48" ref-type="bibr">Sears, 2004</xref>
;
<xref rid="bib19" ref-type="bibr">Farrell and Sears, 2014</xref>
) and introduced Phlpp2 as a key regulator.</p>
<p>Based on our quantitative PCR results, we could exclude transcriptional suppression of
<italic>Myc</italic>
upon
<italic>Phlpp2</italic>
knockout (
<xref ref-type="fig" rid="fig3">Fig. 3 A</xref>
). Instead, Myc protein was decreased by ∼75% on average (
<xref ref-type="fig" rid="fig3">Fig. 3 B</xref>
). Note that, for example, p16/Ink4a was in contrast increased at both protein and mRNA levels (
<xref ref-type="fig" rid="fig1">Fig. 1 B</xref>
and Fig. S2 A). Next, we studied Myc protein turnover as a function of
<italic>Phlpp2</italic>
status using cycloheximide. As shown in
<xref ref-type="fig" rid="fig3">Fig. 3, C and D</xref>
, the
<italic>Phlpp2</italic>
-deficient MEFs consistently showed a reduced half-life of Myc protein (see Fig. S2, B and C, for replicates at various cycloheximide concentrations). Taken together, our results introduced Phlpp2 as a regulator of Myc stability via regulation of T58 phosphorylation.</p>
<fig id="fig3" fig-type="figure" orientation="portrait" position="float">
<label>Figure 3.</label>
<caption>
<p>
<bold>Phlpp2 status controls Myc stability. (A)</bold>
Myc transcript levels measured by quantitative PCR is not affected by genotype. Error bars, SD;
<italic>n =</italic>
4; P
<italic>></italic>
0.05 with Student’s
<italic>t</italic>
test.
<bold>(B)</bold>
Myc protein is decreased in triple-mutant cells by almost 75%. Error bars, SD;
<italic>n</italic>
≥ 7; ***, P < 0.001 with Student’s
<italic>t</italic>
test (left panel). Right panel: Myc and Phlpp2 protein levels from WT,
<italic>Pten</italic>
/
<italic>Trp53</italic>
-, and
<italic>Pten</italic>
/
<italic>Trp53</italic>
/
<italic>Phlpp2</italic>
-negative cells.
<bold>(C)</bold>
Myc half-life as measured in MEFs of both genotypes after treatment with 100 µg/ml of cycloheximide.
<bold>(D)</bold>
Quantification of Western blot shows significantly shortened half-life of Myc in triple-mutant cells compared with the Phlpp2-positive cells. This graph represents densitometric analysis of Myc normalized with β-actin from the corresponding Western blot in
<xref ref-type="fig" rid="fig3">Fig. 3 C</xref>
. Lines (blue:
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
; and red:
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
) represent the nonlinear regression model, using the one-phase exponential decay curves. Myc half-life T
<sub>1/2</sub>
was calculated based on this model,
<italic>n = 1</italic>
. Note that independent biological replicates are shown and quantified in Fig. S2, B and C. ns, not significant; qPCR, quantitative PCR; wt, wild-type.</p>
</caption>
<graphic xlink:href="JCB_201902048_Fig3"></graphic>
</fig>
</sec>
<sec id="s05">
<title>PHLPP2 directly dephosphorylates Myc</title>
<p>To address whether PHLPP2 targets Myc directly, we first expressed HA-PHLPP2 in 293T cells. These lysates were then mixed with lysates from the murine PC-derived MycCaP cells, which express elevated levels of transgenic Myc (
<xref rid="bib56" ref-type="bibr">Watson et al., 2005</xref>
). Co-immunoprecipitation revealed that overexpressed HA-PHLPP2 specifically pulled down the transgenic Myc, consistent with a direct interaction (
<xref ref-type="fig" rid="fig4">Fig. 4 A</xref>
). We next examined if PHLPP2 directly and selectively dephosphorylates the T58 residue on Myc. The purified FLAG-tagged PP2C domain of PHLPP2 (
<xref rid="bib52" ref-type="bibr">Sierecki et al., 2010</xref>
) was incubated with cell lysates derived from
<italic>Pten</italic>
/
<italic>Trp53</italic>
/
<italic>Phlpp2</italic>
-negative cells, which present well-detected levels of phosphorylated Myc at T58. As shown (
<xref ref-type="fig" rid="fig4">Fig. 4 B</xref>
), this incubation resulted in strong dephosphorylation of T58 (lane 3 vs. lane 4) that was effectively blocked by a PHLPP2 inhibitor (lane 5 vs. lane 6). Similar results were obtained when testing our positive control, the known regulation of PKC by PHLPP2 (
<xref ref-type="fig" rid="fig4">Fig. 4 B</xref>
and Fig. S3 A). To test if PHLPP2 also affects S62 of Myc, the purified FLAG-tagged PP2C domain of PHLPP2 was incubated with cell lysates derived from OA-treated, Pten/p53-deficient cells generating visibly phosphorylated Myc-S62 because of the PP2A inhibition. In contrast to T58, however, this incubation did not result in dephosphorylation of S62 (
<xref ref-type="fig" rid="fig4">Fig. 4 C</xref>
, lane 3 vs. lane 4), consistent with specific dephosphorylation of pMYC
<sup>T58</sup>
by PHLPP2. Lambda phosphatase, a broadly active serine–threonine phosphatase, was used as a positive control for dephosphorylation in these assays (
<xref ref-type="fig" rid="fig4">Fig. 4, B and C</xref>
, lane 7 vs. lane 8). The PP2C domain is mediating PHLPP1/2 phosphatase activity, but the similarity between the paralogs is only 57% at the amino acid level (
<xref ref-type="fig" rid="fig4">Fig. 4 D</xref>
and Fig. S3 B). We thus also tested the kinetics of dephosphorylation by the PP2C domain of PHLPP1 and found that it did not cause dephosphorylation of pMYC at T58 (
<xref ref-type="fig" rid="fig4">Fig. 4 D</xref>
). Collectively, these results strongly suggested that PHLPP2 directly dephosphorylates the T58 site of MYC, but not S62.</p>
<fig id="fig4" fig-type="figure" orientation="portrait" position="float">
<label>Figure 4.</label>
<caption>
<p>
<bold>Phlpp2 dephosphorylates Myc directly. (A)</bold>
Co-immunoprecipitation experiments revealed that overexpressed HA-tagged PHLPP2 pulled-down transgenic (Tg) Myc (from MycCaP cells), consistent with a direct interaction.
<bold>(B)</bold>
PHLPP2 directly dephosphorylates T58 on Myc. Incubation with the FLAG-tagged PHLPP2 PP2C domain (arrow) resulted in a decrease in T58 phosphorylation after 60 min of incubation (lanes 3 and 4). Dephosphorylation was blocked by a small-molecule inhibitor of PHLPP2 (lanes 5 and 6).
<bold>(C)</bold>
PHLPP2 does not dephosphorylate S62 on Myc. Incubation with the FLAG-PP2C domain of PHLPP2 (arrow) did not affect S62 phosphorylation after 60 min of incubation (lanes 3 and 4). Dephosphorylation was not affected by a small-molecule inhibitor of PHLPP2 (lanes 5 and 6).
<bold>(D)</bold>
The purified FLAG-tagged PP2C domain of PHLPP2 was incubated with phosphorylated purified Myc protein for different time points. Incubation with the PP2C domain of PHLPP1 did not affect T58 even after 90 min. In contrast, incubation with the PP2C domain of PHLPP2 resulted in a decrease in T58 phosphorylation that was most significant after 90 min.
<bold>(E)</bold>
Myc
<sup>T58A</sup>
levels increase compared with WT MYC regardless of
<italic>Phlpp2</italic>
demonstrating that this site is key for Phlpp2-mediated Myc regulation. wt, wild-type.</p>
</caption>
<graphic xlink:href="JCB_201902048_Fig4"></graphic>
</fig>
<p>Phosphorylation on T58 is a signal for MYC degradation (
<xref rid="bib49" ref-type="bibr">Sears et al., 2000</xref>
;
<xref rid="bib57" ref-type="bibr">Welcker et al., 2004</xref>
), and the lymphoma-associated T58A mutation of MYC has therefore enhanced oncogenicity (
<xref rid="bib25" ref-type="bibr">Hemann et al., 2005</xref>
). Based on our findings, MycT58A protein levels should thus not be affected by
<italic>Phlpp2</italic>
deletion. Indeed, as shown in
<xref ref-type="fig" rid="fig4">Fig. 4 E</xref>
, we found that Myc
<sup>T58A</sup>
levels were insensitive to
<italic>Phlpp2</italic>
deletion as we observed strong Myc
<sup>T58A</sup>
expression under conditions where we could not detect Myc
<sup>WT</sup>
expression in the
<italic>Phlpp2</italic>
-deficient cells (
<xref ref-type="fig" rid="fig4">Fig. 4 E</xref>
, see V5-Myc, right panels).</p>
</sec>
<sec id="s06">
<title>Pharmacological inhibition of Phlpp2 suppresses Myc and proliferation</title>
<p>Based on the above findings, we next tested the intriguing hypothesis that an inhibitor developed to target the PHLPP2 PP2C domain could have an anticancer effect by suppressing MYC protein, a key oncogene that cannot yet be pharmacologically controlled. Various cell types were therefore treated with this inhibitor (NCI45586; see
<xref rid="bib52" ref-type="bibr">Sierecki et al., 2010</xref>
). First, we tested two GEM-derived cell lines, known to drive PC through Myc (
<xref rid="bib56" ref-type="bibr">Watson et al., 2005</xref>
;
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
). As expected, the Phlpp2 inhibitor induced a dose-dependent increase in phospho-S473 of Akt in the
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
cells (
<xref ref-type="fig" rid="fig5">Fig. 5 A</xref>
). Importantly, this was accompanied by a dose-dependent reduction in total Myc protein, entirely consistent with our observations above. The murine PC-derived MycCaP cell line showed the same opposite effects on Myc and Akt (
<xref ref-type="fig" rid="fig5">Fig. 5 B</xref>
) as well as an increase in cell death (Fig. S3 C). We confirmed that the inhibitor also caused cell death in our RapidCaP PC-derived RCaP cells (
<xref rid="bib39" ref-type="bibr">Naguib et al., 2018</xref>
; see Fig. S3 D) and that genetic ablation of
<italic>Phlpp2</italic>
increased cell death in MEFs (Fig. S3 E). These results strongly indicated that Myc levels, rather than Akt activation, drive survival and proliferation in the cells, a hierarchical relation that is consistent with our previously published results in cells (
<xref rid="bib42" ref-type="bibr">Nowak et al., 2015</xref>
) and in mouse primary and metastatic PC (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
).</p>
<fig id="fig5" fig-type="figure" orientation="portrait" position="float">
<label>Figure 5.</label>
<caption>
<p>
<bold>Small-molecule PHLPP2 inhibitors suppress MYC and trigger cell death. (A)</bold>
Treatment with a PHLPP2 inhibitor decreases Myc expression and increases pAkt
<sup>S473</sup>
activation in
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
cells, compared with control DMSO treatment.
<bold>(B)</bold>
PHLPP2 inhibitor treatment results in decreased Myc expression and increased Akt activation in the MycCaP murine PC cell line. Lines indicate splicing of three irrelevant lanes.
<bold>(C)</bold>
Treatment with the PHLPP2 inhibitor decreases Myc expression and increases pAkt
<sup>S473</sup>
activation in DU145 cells, compared with control DMSO treatment.
<bold>(D)</bold>
Relative cell viability of DU145 cells upon PHLPP2 inhibitor treatment. The mean with error bars, SD (
<italic>n</italic>
= 6), and dose–response curves are plotted. IC50 values were derived from curves fitted using a nonlinear regression model.
<bold>(E)</bold>
Treatment with the PHLPP2 inhibitor decreases cell numbers measured with crystal violet assays in DU145 cells, compared with control DMSO. ANOVA, Dunnett’s post hoc test; *, P < 0.05; ***, P < 0.001 versus control; error bars, SD;
<italic>n</italic>
= 4.
<bold>(F)</bold>
Treatment with the PHLPP2 inhibitor increases cell death as shown by PI staining. ANOVA, Dunnett’s post hoc test; ***, P < 0.001 versus control; error bars, SD;
<italic>n</italic>
= 4.
<bold>(G)</bold>
PHLPP2 inhibitor treatment suppresses Myc and activates Akt in the PC3 human metastatic PC cell line.
<bold>(H)</bold>
Relative cell viability of PC3 cells upon PHLPP2 inhibitor treatment. The mean ± SD (
<italic>n</italic>
= 3) and dose–response curves are plotted. IC50 values were derived from curves fitted using a nonlinear regression model using.
<bold>(I)</bold>
Treatment with the PHLPP2 inhibitor increases cell death as shown by the PI-positive cell fraction. ANOVA, Dunnett’s post hoc test; ***, P < 0.001 versus control; error bars, SD;
<italic>n</italic>
= 4.</p>
</caption>
<graphic xlink:href="JCB_201902048_Fig5"></graphic>
</fig>
<p>We next tested human PC cell lines. In the metastasis-derived DU145 cells, NCI45586 also showed suppression of MYC and some activation of AKT (
<xref ref-type="fig" rid="fig5">Fig. 5 C</xref>
; see Fig. S3 F for replicates). Treatment with inhibitor led to decreased cell viability and proliferation (
<xref ref-type="fig" rid="fig5">Fig. 5 E</xref>
), and it increased cell death (
<xref ref-type="fig" rid="fig5">Fig. 5 F</xref>
). Similarly, in the bone metastasis–derived PC3 cells, the inhibitor caused suppression of MYC and a decrease in cell viability, despite activation of AKT (
<xref ref-type="fig" rid="fig5">Fig. 5, G–I</xref>
; and Fig. S3 G). Our results with the NCI45586 tool compound closely mirrored those from genetic ablation of the
<italic>PHLPP2</italic>
gene, a proof of concept that could lead to development of pharmacologically relevant drugs. In summary, our results showed that the PHLPP2 function of protecting MYC can be targeted to kill
<italic>PTEN</italic>
mutant cells.</p>
</sec>
<sec id="s07">
<title>Deletion of
<italic>Phlpp2</italic>
slows down primary tumor growth and prevents progression to metastasis</title>
<p>We have recently developed RapidCaP, a GEM model for analysis and therapy of endogenous metastatic PC (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
). Of note, we could show that metastasis to multiple organs can be selectively targeted using JQ1 to transcriptionally suppress Myc. Thus, we now used RapidCaP to test how ablation of
<italic>Phlpp2</italic>
would affect disease (note that NCI45586 cannot be used in mice). We generated conditional knockout mice (
<italic>Phlpp2</italic>
<sup>loxP/loxP</sup>
) and crossed them to the
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
mice on which RapidCaP is based to generate the novel triple-mutant
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
;
<italic>Phlpp2</italic>
<sup>loxP/loxP</sup>
mice (Fig. S4, A and B). Next, we used the RapidCaP system of intraprostatic Cre-Luciferase virus delivery to generate a trial cohort of
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
mice and compared their disease progression and outcome to that of the
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
RapidCaP mice. As shown in
<xref ref-type="fig" rid="fig6">Fig. 6 A</xref>
, four out of five
<italic>Pten</italic>
/
<italic>Trp53</italic>
double-mutant mice presented with strong disease signals over a period of 10 mo. They also showed bioluminescent signal derived from metastases that was clearly distant and distinct from the prostate-derived signal seen in the lower abdomen. Kaplan-Meier analysis of metastasis onset and outcome in the double-mutant mice (
<xref ref-type="fig" rid="fig6">Fig. 6, A and B</xref>
) showed overall kinetics that were very similar to what we originally published (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
). In contrast, the cohort with
<italic>Phlpp2</italic>
deletion showed significantly reduced overall disease burden after a 10-mo follow up (
<xref ref-type="fig" rid="fig6">Fig. 6, A–C</xref>
;
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
). Yet, as seen in
<xref ref-type="fig" rid="fig6">Fig. 6 C</xref>
, quantification showed an insignificant difference between the two cohorts at 4 mo (P = 0.6, two-tailed Fisher’s exact test), demonstrating the lack of metastatic progression potential of the
<italic>Phlpp2</italic>
mutant prostate tumors. Postmortem analysis of the disease (
<xref ref-type="fig" rid="fig6">Fig. 6 D</xref>
) indicated metastasis to lymph nodes, liver, and spleen, as previously described for RapidCaP (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
), but not in the triple-mutant animals (Fig. S4 C). Histological examination of luciferase-positive lymph nodes allowed us to identify the nests of large metastatic tumor cells with prominent nucleoli and pale pleomorphic nuclei (
<xref ref-type="fig" rid="fig6">Fig. 6 D</xref>
, right panel, red arrows) embedded within the lymphocytes. Note that total sectioning of lymph nodes from the triple-mutant cohort did not reveal any metastatic cells (data not shown).</p>
<fig id="fig6" fig-type="figure" orientation="portrait" position="float">
<label>Figure 6.</label>
<caption>
<p>
<bold>
<italic>Phlpp2</italic>
is required for progression of
<italic>Pten</italic>
mutant PC. (A)</bold>
Comparison of PC progression to metastasis in double- and triple-mutant RapidCaP mice as determined by bioluminescent (BLI) imaging. In the
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
system, four out of five animals present with primary and metastatic signal within 10 mo, while little to insignificant disease is imaged in
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
.
<bold>(B)</bold>
Kaplan–Meier analysis shows the early onset of metastasis in
<italic>Pten</italic>
<sup>ΔΔ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
compared with
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
mice as determined by monthly luciferase imaging. P = 0.0042 with log-rank (Mantel-Cox) test;
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
:
<italic>n</italic>
= 5;
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
:
<italic>n</italic>
= 16.
<bold>(C)</bold>
Bioluminescent signals are significantly lowered in
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
animals compared with
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
mice at 10 mo but not at 4 mo (P = 0.6, two-tailed Student’s
<italic>t</italic>
test). Each dot represents bioluminescent (BLI) signal from one animal, lines are means, and indicated P values are for two-tailed Student’s
<italic>t</italic>
tests.
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
:
<italic>n</italic>
= 5;
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
;
<italic>Phlpp2</italic>
<sup>Δ/Δ</sup>
:
<italic>n</italic>
= 16.
<bold>(D)</bold>
Postmortem luciferase analysis confirms metastasis to secondary organs in
<italic>Pten</italic>
<sup>Δ/Δ</sup>
;
<italic>Trp53</italic>
<sup>Δ/Δ</sup>
(left panels). The right panel shows a typical nest of prostate tumor cells having metastasized to the luciferase-positive lymph node shown in the left panel. White asterisks indicate normal lymphocytes, and red arrows indicate metastatic prostate tumor cells. Scale bar, 20 µm.</p>
</caption>
<graphic xlink:href="JCB_201902048_Fig6"></graphic>
</fig>
<p>Taken together, our in vivo genetic validation data demonstrated that
<italic>Phlpp2</italic>
is required for the tumor and metastasis formation seen in the
<italic>Pten</italic>
/
<italic>Trp53</italic>
-mutant RapidCaP model.</p>
</sec>
</sec>
<sec sec-type="discussion" id="s08">
<title>Discussion</title>
<p>By activating MYC and suppressing AKT, PHLPP2 exhibits a dual nature in cancer. This may be reflected in its cancer-associated alteration patterns, which are dictated by broad chromosomal 16q hemizygous deletions and some amplifications, as shown in Fig. S5 A. Also, in PC, the vast majority of
<italic>PHLPP2</italic>
mutations are broad 16q deletions (Fig. S5 B), which may result in some AKT activation, as we have shown for
<italic>Phlpp1</italic>
loss (
<xref rid="bib8" ref-type="bibr">Chen et al., 2011</xref>
). Yet, the remaining allele is widely retained in human PC metastasis (Fig. S5 C) and clearly necessary to obtain metastasis in RapidCaP, as shown above. This requirement for the retention of one allele has been recognized as a druggable vulnerability of cancer (“Cyclops” genes;
<xref rid="bib41" ref-type="bibr">Nijhawan et al., 2012</xref>
). Indeed, an unbiased analysis of such Cyclops gene candidates from human cancer data did include PHLPP2 (see Table S3 in
<xref rid="bib41" ref-type="bibr">Nijhawan et al., 2012</xref>
). Thus, PHLPP2 could fall into a new type of category of cancer genes. Its hemizygous loss can promote cancer through AKT activation. The remaining allele, however, is protected because it mediates survival through MYC. Thus, PHLPP2 is in a unique position to regulate the signaling plasticity of a cell and its switching between AKT (epithelial) and MYC (mesenchymal) phenotypes. This switch can be observed in primary PC, and it can drive
<italic>Pten</italic>
-deficient metastasis (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
;
<xref rid="bib42" ref-type="bibr">Nowak et al., 2015</xref>
). It is intriguing to speculate that these opposing activities may be achieved by regulation of PHLPP2 pools in the nucleus (MYC) and the cytoplasm (AKT).</p>
<p>Several independent studies have now confirmed the existence of a
<italic>Pten</italic>
-null Akt-off state in PC (
<xref rid="bib31" ref-type="bibr">Ku et al., 2017</xref>
;
<xref rid="bib62" ref-type="bibr">Zou et al., 2017</xref>
). In humans, the modeling of “AR indifference” by pharmaco-genetic AR suppression of the
<italic>PTEN</italic>
-deficient LNCaP cell line (
<xref rid="bib3" ref-type="bibr">Bluemn et al., 2017</xref>
) revealed that the derived AR-negative, ADT (androgen deprivation therapy)-resistant cells no longer showed detectable AKT pathway activity despite PTEN deficiency, closely mirroring our findings in RapidCaP mice, especially after castration. Collectively, these results highlight the importance of understanding AKT-negative, PTEN-deficient disease, as it appears to be among the drivers of resistance to the latest generation of androgen deprivation therapy.</p>
<p>It is estimated that 450,000 Americans are diagnosed each year with a cancer that is driven by MYC (
<xref rid="bib38" ref-type="bibr">McKeown and Bradner, 2014</xref>
). MYC is a validated driver of PC in GEM models of primary disease and metastasis (
<xref rid="bib18" ref-type="bibr">Ellwood-Yen et al., 2003</xref>
;
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
). To date, there is no drug that directly targets MYC because inhibitor design is limited by the lack of good target motifs or clefts (
<xref rid="bib38" ref-type="bibr">McKeown and Bradner, 2014</xref>
). Yet, several indirect strategies have shown promise. Foremost among them is inhibition at the level of transcription using inhibitors of BRD4, such as the small molecule JQ1 (
<xref rid="bib14" ref-type="bibr">Delmore et al., 2011</xref>
). This approach has shown much promise in GEM models of, for example, leukemia (
<xref rid="bib63" ref-type="bibr">Zuber et al., 2011</xref>
), metastatic PC (
<xref rid="bib12" ref-type="bibr">Cho et al., 2014</xref>
), lung cancer, and neuroblastoma (
<xref rid="bib45" ref-type="bibr">Puissant et al., 2013</xref>
;
<xref rid="bib51" ref-type="bibr">Shimamura et al., 2013</xref>
). This strategy is now the basis for several clinical trials (
<xref rid="bib34" ref-type="bibr">Liu et al., 2017</xref>
). Other approaches target upstream activators of MYC, such as NOTCH1 (
<xref rid="bib59" ref-type="bibr">Weng et al., 2006</xref>
), or interfere with MYC stability through indirect activation of PP2A. Activation of PP2A, however, presents a formidable challenge because it (1) requires indirect suppression of its endogenous inhibitors (
<xref rid="bib28" ref-type="bibr">Janghorban et al., 2014</xref>
;
<xref rid="bib29" ref-type="bibr">Kaur and Westermarck, 2016</xref>
), (2) forms over 70 active holoenzyme complexes, and thus (3) is known to control many proteins and processes (
<xref rid="bib47" ref-type="bibr">Sangodkar et al., 2016</xref>
).</p>
<p>We show that PHLPP2 protects MYC from degradation. PHLPP2 dephosphorylates the T58 site of MYC, thus directly increasing its stability (see model in
<xref ref-type="fig" rid="fig7">Fig. 7</xref>
). This residue suffers recurrent mutation (T58A) in patients with Burkitt’s lymphoma, and it was shown to cause increased transformation in vitro and lymphoma in vivo (
<xref rid="bib7" ref-type="bibr">Chang et al., 2000</xref>
;
<xref rid="bib25" ref-type="bibr">Hemann et al., 2005</xref>
). The T58A mutant is constitutively dephosphorylated, mimicking constant PHLPP2 activity. Thus, its natural selection in MYC-driven human lymphoma impressively demonstrates the oncogenic power of PHLPP2 action on MYC.</p>
<fig id="fig7" fig-type="figure" orientation="portrait" position="float">
<label>Figure 7.</label>
<caption>
<p>
<bold>Proposed model for PHLPP2.</bold>
PHLPP2 protects MYC from degradation resulting in PC progression. PHLPP2 dephosphorylates the T58 site of MYC, thus directly increasing its stability. Small-molecule inhibitors of PHLPP2 have been discovered (
<xref rid="bib52" ref-type="bibr">Sierecki et al., 2010</xref>
). PHLPP2 thus has opposing roles in PC: while suppressing AKT activation, it stabilizes MYC progression. Our data suggest that the latter function is critical for PC progression.</p>
</caption>
<graphic xlink:href="JCB_201902048_Fig7"></graphic>
</fig>
<p>Small-molecule inhibitors of PHLPP2 have been discovered (
<xref rid="bib52" ref-type="bibr">Sierecki et al., 2010</xref>
). We show that they can be used to suppress MYC and cause cell death. The compounds were screened from the First Diversity Set of the National Cancer Institute, which comprises 1990 small molecules. At this stage, they should be considered proof of principle compounds, rather than drugs. This suggests, however, that targeted efforts for designing PHLPP2 inhibitors could result in very efficient new drugs that suppress MYC-driven cancer (see proposed model,
<xref ref-type="fig" rid="fig7">Fig. 7</xref>
).</p>
<p>The PHLPP2 phosphatase is an attractive drug target for several reasons. First, we show that
<italic>Pten</italic>
-deficient metastatic PC cells fully depend on it. In contrast, normal cells do not, as demonstrated by the normal viability of the
<italic>Phlpp2</italic>
knockout mice (
<xref rid="bib58" ref-type="bibr">Wen et al., 2015</xref>
). Next, general advances in structural understanding of phosphatases have led to a “renaissance” of inhibitor design (
<xref rid="bib30" ref-type="bibr">Krishnan et al., 2014</xref>
;
<xref rid="bib10" ref-type="bibr">Chen et al., 2016</xref>
). By looking beyond the active site, novel allosteric inhibitors can now shut down phosphatases that used to be considered “undruggable.” This could also apply to the PP2C-type active site of PHLPP2. Thus, our work introduces the PHLPP2 phosphatase as an unexpected, yet druggable, driver of MYC-driven PC and its progression.</p>
</sec>
<sec sec-type="materials|methods" id="s09">
<title>Materials and methods</title>
<sec id="s10">
<title>Mice</title>
<p>
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
and
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
;
<italic>Phlpp2</italic>
<sup>loxP/loxP</sup>
were used in this study. All protocols for mouse experiments were done in accordance with the institutional guidelines and approved by Institutional Animal Care and Use Committee. For the creating of
<italic>Phlpp2</italic>
<sup>loxP/loxP</sup>
animals, we used embryonic stem cells that were received from the Mouse Phenotype Consortium (Phlpp2-IKMC Project: 47191). We used promoter-driven targeting cassettes for the generation of a “knockout-first allele” in C57BL/6N mice. First, mice were bred to a flipase (Flp) mouse to remove lacZ/loxP/neo cassette that gave a rise to loxP conditional mice. Following removal of the floxed region using Cre, our expression analysis confirmed knockouts of Phlpp2 at the protein level.
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
,
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
, and
<italic>Phlpp2</italic>
<sup>loxP/loxP</sup>
transgenic mice were generated by crossing
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;Trp53
<sup>loxP/loxP</sup>
and
<italic>Phlpp2</italic>
<sup>loxP/loxP</sup>
. For genotyping, PCR of tail DNA was used with the following primers: for
<italic>Pten</italic>
<sup>loxP/loxP</sup>
, primer 1 (5′-TGT​TTT​TGA​CCA​ATT​AAA​GTA​GGC​TGT​G-3′) and primer 2 (5′-AAA​AGT​TCC​CCT​GCT​GAT​GAT​TTG​T-3′) were used; for
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
, primer 1 (5′-CAC​AAA​AAC​AGG​TTA​AAC​CCA​G-3′) and primer 2 (5′-AGC​ACA​TAG​GAG​GCA​GAG​AC-3′) were used; and for
<italic>Phlpp2</italic>
<sup>loxP/loxP</sup>
, primer 1 (5′-GAT​GCT​CTG​CTT​CTG​CTC​CTG​TGC-3′) and primer 2 (5′-GAT​ATG​AGG​AAC​GAA​GCA​ATA​TGG​G-3′) were used.</p>
</sec>
<sec id="s11">
<title>MEFs</title>
<p>Animals with different combinations of loxP alleles were used. At 13.5 d, embryos were harvested by sacrificing a female using CO
<sub>2</sub>
. Embryos were minced and trypsinized for 15 min in a 37°C water bath. Cells were plated on a 10-cm dish and cultured in 10% DMEM and 1× penicillin–streptomycin. 72 h after plating, cells were split into a 10-cm dish at 900,000 cells per dish per 15-ml volume of 10% DMEM and 1× penicillin–streptomycin. Cells were cultured for the next 3 d, collected, frozen in 20% dimethyl sulfoxide/80% FBS, and stored in batches of 1,000,000 cells per cryovial in liquid nitrogen. All protocols for mouse experiments were conducted in accordance with the institutional guidelines and were approved by the Institutional Animal Care and Use Committee at Cold Spring Harbor Laboratory (protocol number 562709, “Tumor suppressor mutation in mouse models for cancer”).</p>
</sec>
<sec id="s12">
<title>Cancer cell lines</title>
<p>Cell lines were used and cultured in 10% DMEM (MycCaP) or RPMI (PC3, DU45) medium and 1× penicillin–streptomycin.</p>
</sec>
<sec id="s13">
<title>Drug treatments on 2D cell lines and propidium iodide analysis</title>
<p>For PHLPP2 inhibitor experiments, the NCI45586 compound was used to assess effects of PHLPP2 on pAkt, Myc signaling, and cell death measured with propidium iodide (PI) using Guava easyCyte 8HT Benchtop Flow Cytometer (Millipore Sigma). The PHLPP2 inhibitor was resuspended in DMSO and used as previously described (
<xref rid="bib52" ref-type="bibr">Sierecki et al., 2010</xref>
).</p>
</sec>
<sec id="s14">
<title>Drug treatment on 3D cultured RapidCaP-derived prostate epithelial cells</title>
<p>3D cultures of a RapidCaP-derived prostate cell line was performed as per the protocol in
<xref rid="bib17" ref-type="bibr">Drost et al. (2016)</xref>
. Matrigel was thawed overnight at 4°C and placed on ice during the experiment. Prechilled glass-bottom 6-well plates were coated with a thin layer of Matrigel (5 µl) and incubated for 30 min at 37°C to allow the Matrigel to set. Cells (80% confluent) were harvested to a single-cell suspension by trypsinization. Approximately 15,000 cells were aliquoted into a 1.5-ml microcentrifuge tube, pelleted, and resuspended in 100 µl of Matrigel. The mixture of cells and Matrigel was gently mixed. Three 30-µl aliquots of the mixture was carefully overlaid onto the precoated surface of the glass plate and allowed to set for 15 min at 37°C. Once the Matrigel had set, cell culture media was carefully added to the wells. The culture was maintained for 5 d before drug treatment and media changed every 2 d. For drug treatment, 1 ml of fresh basal media with vehicle or drug was added to overnight serum-starved cells. 72 h after treatment, media were removed and cells were extracted from Matrigel and dissociated for cell viability analysis using trypan blue dye.</p>
</sec>
<sec id="s15">
<title>RNA isolation and quantitative RT-PCR</title>
<p>Isolation of RNA was performed using TRIzol (Invitrogen) and purified by precipitation with isopropanol. Total RNA was reverse transcribed using the High Capacity cDNA Reverse Transcription Kit (Life Technologies) according to the manufacturer’s indications. 2 μl of this cDNA was then amplified by real-time PCR in a final volume of 10 μl per reaction on a StepOnePlus System thermocycler using the respective assays (Life Technologies). All reactions were performed in triplicate. The relative expression of
<italic>Myc</italic>
,
<italic>p16</italic>
, and
<italic>Phlpp2</italic>
was determined using the mean value of the control samples (WT) as calibrator and following the 2
<sup>-ΔΔCt</sup>
method.</p>
</sec>
<sec id="s16">
<title>Western blotting</title>
<p>To asses protein expression, we used SDS-PAGE (8% and 10% reducing gels, 5% 2-β mercaptoethanol). Gels were loaded with 20–40 μg protein per well (Bradford assay). The following antibodies were used: β-actin (1:30,000; Sigma-Aldrich), pAKT (S473; 193H12, 1:3,000; Cell Signaling Technology), total AKT (40D4, 1:3,000; Cell Signaling Technology), c-Myc (ab32072; 1:3,000; Abcam), pMYC (T58; ab28842, 1:1,000; Abcam), pMYC (S62; E1J4K, 1:1,000; Cell Signaling Technology), proliferating cell nuclear antigen (PCNA) (PC10, 1:6,000; Santa Cruz Biotechnology), PTEN (6H2.1; 1:1,000; Cascade Bioscience), p16 (M-156; 1:1,000; Santa Cruz Biotechnology), PHLPP2 (A300-661A; 1:1,000), and V5-tag (#13202, 1:1,000; Cell Signaling Technology). ECL was used with Amersham Hyperfilm ECL (Amersham Bioscience) combined with signal intensity analysis using the ImageJ 1.38× software. Infrared-based recording and quantification were done using the LiCor Odyssey Classic infrared scanner and Image Studio Lite software version 5.2. Histogram analysis was done to prevent pixel saturation and clipping.</p>
</sec>
<sec id="s17">
<title>MTT assays</title>
<p>10,000 cells/well were seeded in full media (RPMI, 10% FBS) on a 96-well plate and left to adhere overnight. The cells were serum starved (RPMI, 0% FBS) for 24 h. After serum starvation, the cells were treated with an eight-point twofold dilution of the Phlpp2 inhibitor (compound #13) in 2% FBS-RPMI for 96 h. After treatment, the medium containing the compound was removed and MTT solution was added. After labeling cells with MTT, the absorbance was read at 570 nM.</p>
</sec>
<sec id="s18">
<title>Crystal violet assay</title>
<p>Cell proliferation was also measured using the crystal violet method as previously described (
<xref rid="bib42" ref-type="bibr">Nowak et al., 2015</xref>
). Cells were fixed in 10% formalin for 15 min, washed with sterile water, and stained with 0.1% crystal violet solution. Solutions were aspirated and washed with water, and then plates were air dried overnight. After this, 10% acetic acid was added and mixed with water in a 1:3 ratio. Absorbance was measured at 590 nm using a plate reader (Synergy H4 Hybrid Multi-Mode Microplate Reader; Biotek).</p>
</sec>
<sec id="s19">
<title>Myc mutant transfection</title>
<p>
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
and
<italic>Pten</italic>
<sup>loxP/loxP</sup>
;
<italic>Trp53</italic>
<sup>loxP/loxP</sup>
;
<italic>Phlpp2</italic>
<sup>loxP/loxP</sup>
cells previously infected with adenovirus carrying Cre recombinase were seeded in the full media (DMEM, 10% FBS) on a 6-well plate and left to adhere overnight. Cells then were transfected with plasmids: pD40-His/V5-c-Myc (Addgene; #45597) and pD40-His/V5-c-MycT58A (Addgene; #45598;
<xref rid="bib60" ref-type="bibr">Yeh et al., 2004</xref>
) using Lipofectamine 2000 following the manufacturer’s protocol (Thermo Fisher Scientific; 11668027). 16 h after transfection, cells were analyzed using Western blots.</p>
</sec>
<sec id="s20">
<title>siRNAi transfection targeting
<italic>PHLPP2</italic>
</title>
<p>PC3 and DU145 cells were transfected with siRNAi control (ON-TARGETplus Non-targeting Pool; Darmacon) and siRNAi targeting PHLPP2 (ON-TARGETplus Human PHLPP2; Darmacon) using DharmaFECT following the manufacturer’s protocol. 48–72 h after transfection, cells were analyzed using Western blots.</p>
</sec>
<sec id="s21">
<title>Immunoprecipitation</title>
<p>DNA was transfected into HEK-293T cells using FuGene6 (Roche). Cells were collected 24 h after transfection and then lysed in a buffer containing 50 mM Na
<sub>2</sub>
HPO
<sub>4</sub>
(pH 7.5), 1 mM sodium pyrophosphate, 20 mM NaF, 2 mM EDTA, 2 mM EGTA, 1% SDS, 1 mM DTT, 1 µM microcystin, 20 µM bezamidine, 40 µg/ml leupeptin, and 1 mM PMSF and then were sonicated briefly. For co-immunoprecipitation, cells were lysed and the detergent-solubilized cell lysates were incubated with an anti-HA antibody (BioLegend; #901503) at 4°C overnight. The next day, the samples were incubated with protein A/G PLUS-Agarose (Santa Cruz Biotechnology; #sc-2003) for 1 h at 4°C and then washed three times in lysis buffer containing 0.05 M NaCl and 0.25% Triton-X. Bound proteins and lysates were separated by SDS-PAGE gel and analyzed by Western blotting.</p>
</sec>
<sec id="s22">
<title>Phosphatase assays</title>
<p>A 3XFLAG-tagged protein PHLPP2-PP2C was expressed in HEK-293T cells and purified using anti-FLAG M2 affinity gel (Sigma-Aldrich; A2220). The FLAG-PP2C protein was eluted from the beads in elution buffer containing 50 mM Hepes, pH 7.4, 100 mM NaCl, 1 mM DTT, 0.1 mM Na
<sub>3</sub>
VO
<sub>4</sub>
, 0.01% NP-40, 10% glycerol, and 0.5 mg/ml 3XFLAG peptide (Sigma-Aldrich; F4799). Recombinant human Myc protein was purchased from Abcam (ab169901). To obtain phosphorylated Myc as substrate, in vitro kinase assays were performed by incubating cMyc (0.30 µM) with recombinant human GSK3 β (54.79 nM; ab60863; Abcam) at 30°C for 15 min. Reactions were stopped using 40 µM staurosporine (Calbiochem). The dephosphorylation reactions were performed with 3XFLAG-PP2C (0.76 µM) and phosphorylated cMyc (0.30 µM) as a substrate in a reaction buffer containing 50 mM Tris (pH 7.4), 1 mM DTT, and 5 mM MnCl
<sub>2</sub>
at 30°C for 0–90 min.</p>
</sec>
<sec id="s23">
<title>Lentivirus production</title>
<p>293FT cells were plated at a density of 400,000 cells/ml in the volume of 27 ml per 15-cm dish. The next day, target DNA (27 μg) was combined with packaging constructs, 8 μg of pMD2.G and 20 µg of psPAX2, and 2 mol/liter calcium chloride. The mixture was then added dropwise to cells that were treated with 6.7 μl 100 mmol/liter chloroquine. Medium was changed after 14 h, and viral supernatants were collected 72 h after transfection. Supernatants were then centrifuged and filtered with a 0.45-μm filter before infection of cells. The 293FT cells were bought from Thermo Fisher Scientific (R70007).</p>
</sec>
<sec id="s24">
<title>Lentivirus CRISPR/Cas9 experiments</title>
<p>gRNA were designed using the R package CRISPRseek (
<xref rid="bib61" ref-type="bibr">Zhu et al., 2014</xref>
). The highest-ranking gRNAs were chosen. The gRNA oligonucleotides were purchased from Sigma-Aldrich and phosphorylated and annealed according to previously published protocols (
<xref rid="bib9" ref-type="bibr">Chen et al., 2017</xref>
). The duplex oligonucleotides were subsequently cloned into the lentiCRISPR_V2 plasmid (Addgene Plasmid #52961) or ECPV vector (
<xref rid="bib50" ref-type="bibr">Senturk et al., 2017</xref>
), replacing the 2-kb filler.</p>
</sec>
<sec id="s25">
<title>Virus for mouse injections</title>
<p>The Luc.Cre lentiviral plasmid for mice injections was purchased from Tyler Jacks (Koch Institute for Integrative Cancer Research, MIT; Addgene plasmid #20905). The lentivirus was packaged and purchased from the University of Iowa’s Viral Vector Core.</p>
</sec>
<sec id="s26">
<title>Intraprostate injection</title>
<p>Prior to surgery, the lower half of the mouse abdomen was shaved. The mouse was given 2% isoflurane for the duration of the 15-min procedure. Once deep anesthesia was determined, the abdomen was cleaned with betadine and ethanol twice before the incision was made. A 1.5-cm incision was made through the skin and the peritoneum to the right of the center abdomen. The seminal vesicle and the anterior prostate were removed and injected with 20 μl of lentivirus using a 30-gauge insulin syringe. The peritoneum incision was sutured with dissolvable sutures, and the skin incision was closed with steel EZ clips. The mouse was laid on a warmed cage, allowed to fully recover, and given DietGel. Lidocaine and buprenorphine were provided for pain management.</p>
</sec>
<sec id="s27">
<title>Bioluminescence imaging and tissue histology</title>
<p>For all bioluminescent imaging, a Xenogen IVIS Spectrum was used. For live imaging, animals were injected intraperitoneally with 200 mg/kg of luciferin (D-luciferin, potassium salt; Gold Biotechnology). 3 min after injection, animals were put under 2% isoflurane. At 10 min after luciferin administration, the animals were transferred to the warmed camera stage and placed in a nose cone with continuous 2% isoflurane. Animals were scanned for 3 min and then removed from the camera and recovered in cages. For postmortem imaging, animals were humanely sacrificed using CO
<sub>2</sub>
. The body of the animal was opened up and luciferin was dropped throughout the body and scanned for 3 min in the IVIS Spectrum. After all organs of interest were also removed, luciferin was applied to the organs and scanned for 3 min. For histology analysis, tissue was dissected from the animal and placed in 10% buffered formalin. Tissues were fixed for 24 h, followed by gentle wash and transfer to PBS. After paraffin embedding the tissue was total sectioned at 5-µm thickness and placed on charged glass slides. Every 10th section was stained with hematoxylin and eosin to locate tumor cells. Histology imaging was done at RT on an Axioplan microscope (Zeiss) using a Zeiss 40× A-plan objective (Air; NA = 0.65) and recorded on a Spot Flex 15.2, 64-Mp Shifting Pixel camera and the Spot software version 5.2.</p>
</sec>
<sec id="s28">
<title>Data analysis</title>
<p>Graph analyses were performed using the R programming language and ggplot2 package on Apple Macintosh computers. Values are expressed as the means with SDs unless otherwise stated. To compare two groups, Student’s
<italic>t</italic>
test was used, and P < 0.05 was considered statistically significant. For multiple comparisons, statistical analyses were performed on raw data using the one-way ANOVA test (Dunnett’s post-test) or the one-way ANOVA, with P values corrected for multicomparison testing using the two-stage linear step-up procedure of Benjamini, Krieger, and Yekutieli, with a false discovery rate at 10% using GraphPad Prism 7. P < 0.05 was considered statistically significant. IC50 values were derived from curves fitted using a nonlinear regression model using GraphPad Prism 7. See Table S1 for a list of key resources.</p>
</sec>
<sec id="s29">
<title>Online supplemental material</title>
<p>Fig. S1 shows the mechanism of interaction between Akt and Myc. Fig. S2 shows how Phlpp2 status affects Myc stability. Fig. S3 presents an in vitro analysis of Phlpp2 activity and stability. Fig. S4 shows modeling of
<italic>Phlpp2</italic>
deletion in RapidCaP. Fig. S5 shows that hemizygous, not complete loss of
<italic>PHLPP2</italic>
, is common in advanced PC patients. Table S1 shows a list of key resources.</p>
</sec>
</sec>
<sec sec-type="supplementary-material">
<title>Supplementary Material</title>
<supplementary-material id="PMC_1" content-type="local-data">
<caption>
<title>Supplemental Materials (PDF)</title>
</caption>
<media mimetype="application" mime-subtype="pdf" xlink:href="JCB_201902048_sm.pdf"></media>
</supplementary-material>
</sec>
</body>
<back>
<ack>
<title>Acknowledgments</title>
<p>The authors thank Drs. Kuhulika Bhalla, Danielle Ramazzotti, and Serif Senturk and members of the Trotman laboratory for valuable discussions; the Cold Spring Harbor Laboratory Animal Resources team, Lisa Bianco, Jodi Coblentz, and Michael Cahn for help with animal work; Pamela Moody for cell sorting and FACS advice; and Dorothy Tsang for help with the article. The authors are also very thankful for the generous donations from the local foundation Glen Cove Cares.</p>
<p>L.C. Trotman is a Research Scholar of the American Cancer Society and is supported by the Pershing Square Sohn Foundation. This work was directly supported by grants to L.C. Trotman from the National Institutes of Health (R01 CA137050), the U.S. Department of Defense (DoD W81XWH-14-1-0247), the Pershing Square Sohn Cancer Research Alliance, and the American Cancer Society (RSG-14-069-01-TBE); by grants from the National Institutes of Health to A.C. Newton (R35 GM122523) and K.C. Katsenelson (T32 CA009523); and by grants to D.G. Nowak from the National Institutes of Health (Career Enhancement Program, Weill Cornell Medicine SPORE in Prostate Cancer; P50 CA211024). This research was furthermore supported by the Robertson Research Fund of Cold Spring Harbor Laboratory and by the Cold Spring Harbor Laboratory Cancer Center Support Grant from the National Institutes of Health (5P30CA045508) to support the flow cytometry, sequencing, gene targeting, animal husbandry, and histology analysis of this project.</p>
<p>The authors declare no competing financial interests.</p>
<p>Author contributions: D.G. Nowak, K.C. Katsenelson, K. Watrud, M. Chen, G. Mathew, V.D. D’Andrea, M.F. Lee, M.M. Swamynathan, I. Casanova-Salas, M.C. Jibilian, C.L. Buckholtz, A.J. Ambrico, and C.-H. Pan designed and performed experiments and interpreted the data; J.E. Wilkinson designed animal-related experiments and interpreted data; A.C. Newton and L.C. Trotman guided and provided funding for the research, designed experiments, and interpreted data; and D.G. Nowak, K.C. Katsenelson, A.C. Newton, and L.C. Trotman wrote the manuscript.</p>
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