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MYC predetermines the sensitivity of gastrointestinal cancer to antifolate drugs through regulating TYMS transcription

Identifieur interne : 000241 ( an2020/Analysis ); précédent : 000240; suivant : 000242

MYC predetermines the sensitivity of gastrointestinal cancer to antifolate drugs through regulating TYMS transcription

Auteurs : Tingting Liu [République populaire de Chine] ; Yumin Han [République populaire de Chine] ; Chunhong Yu [République populaire de Chine] ; Yan Ji [République populaire de Chine] ; Changxu Wang [République populaire de Chine] ; Xiaomin Chen [République populaire de Chine] ; Xiang Wang [République populaire de Chine] ; Jiayan Shen [République populaire de Chine] ; Yongfeng Zhang [République populaire de Chine] ; Jing-Yu Lang [République populaire de Chine]

Source :

RBID : PMC:6838448

Abstract

Background

Thymidylate synthase (TYMS) is a successful chemotherapeutic target for anticancer therapy. Numerous TYMS inhibitors have been developed and used for treating gastrointestinal cancer now, but they have limited clinical benefits due to the prevalent unresponsiveness and toxicity. It is urgent to identify a predictive biomarker to guide the precise clinical use of TYMS inhibitors.

Methods

Genome-scale CRISPR-Cas9 knockout screening was performed to identify potential therapeutic targets for treating gastrointestinal tumours as well as key regulators of raltitrexed (RTX) sensitivity. Cell-based functional assays were used to investigate how MYC regulates TYMS transcription. Cancer patient data were used to verify the correlation between drug response and MYC and/or TYMS mRNA levels. Finally, the role of NIPBL inactivation in gastrointestinal cancer was evaluated in vitro and in vivo.

Findings

TYMS is essential for maintaining the viability of gastrointestinal cancer cells, and is selectively inhibited by RTX. Mechanistically, MYC presets gastrointestinal cancer sensitivity to RTX through upregulating TYMS transcription, supported by TCGA data showing that complete response cases to TYMS inhibitors had significantly higher MYC and TYMS mRNA levels than those of progressive diseases. NIPBL inactivation decreases the therapeutic responses of gastrointestinal cancer to RTX through blocking MYC.

Interpretation

Our study unveils a mechanism of how TYMS is transcriptionally regulated by MYC, and provides rationales for the precise use of TYMS inhibitors in the clinic.

Funding

This work was financially supported by grants of NKRDP (2016YFC1302400), STCSM (16JC1406200), NSFC (81872890, 81322034, 81372346) and CAS (QYZDB-SSW-SMC034, XDA12020210).


Url:
DOI: 10.1016/j.ebiom.2019.10.003
PubMed: 31648989
PubMed Central: 6838448


Affiliations:


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PMC:6838448

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<name sortKey="Zhang, Yongfeng" sort="Zhang, Yongfeng" uniqKey="Zhang Y" first="Yongfeng" last="Zhang">Yongfeng Zhang</name>
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<title>Background</title>
<p>Thymidylate synthase (TYMS) is a successful chemotherapeutic target for anticancer therapy. Numerous TYMS inhibitors have been developed and used for treating gastrointestinal cancer now, but they have limited clinical benefits due to the prevalent unresponsiveness and toxicity. It is urgent to identify a predictive biomarker to guide the precise clinical use of TYMS inhibitors.</p>
</sec>
<sec>
<title>Methods</title>
<p>Genome-scale CRISPR-Cas9 knockout screening was performed to identify potential therapeutic targets for treating gastrointestinal tumours as well as key regulators of raltitrexed (RTX) sensitivity. Cell-based functional assays were used to investigate how MYC regulates
<italic>TYMS</italic>
transcription. Cancer patient data were used to verify the correlation between drug response and MYC and/or TYMS mRNA levels. Finally, the role of NIPBL inactivation in gastrointestinal cancer was evaluated
<italic>in vitro</italic>
and
<italic>in vivo</italic>
.</p>
</sec>
<sec>
<title>Findings</title>
<p>TYMS is essential for maintaining the viability of gastrointestinal cancer cells, and is selectively inhibited by RTX. Mechanistically, MYC presets gastrointestinal cancer sensitivity to RTX through upregulating
<italic>TYMS</italic>
transcription, supported by TCGA data showing that complete response cases to TYMS inhibitors had significantly higher MYC and TYMS mRNA levels than those of progressive diseases. NIPBL inactivation decreases the therapeutic responses of gastrointestinal cancer to RTX through blocking MYC.</p>
</sec>
<sec>
<title>Interpretation</title>
<p>Our study unveils a mechanism of how
<italic>TYMS</italic>
is transcriptionally regulated by MYC, and provides rationales for the precise use of TYMS inhibitors in the clinic.</p>
</sec>
<sec>
<title>Funding</title>
<p>This work was financially supported by grants of
<funding-source id="gs0001">NKRDP</funding-source>
(2016YFC1302400),
<funding-source id="gs0002">STCSM</funding-source>
(16JC1406200),
<funding-source id="gs0003">NSFC</funding-source>
(81872890, 81322034, 81372346) and
<funding-source id="gs0004">CAS</funding-source>
(QYZDB-SSW-SMC034, XDA12020210).</p>
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