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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Invadopodia formation in blood clots</title><author><name sortKey="Knowles, Lynn M" sort="Knowles, Lynn M" uniqKey="Knowles L" first="Lynn M" last="Knowles">Lynn M. Knowles</name><affiliation><nlm:aff id="A1">Department of Urology; University of Pittsburgh School of Medicine; Shadyside Medical Center; Pittsburgh, PA USA</nlm:aff></affiliation></author><author><name sortKey="Maranchie, Jodi K" sort="Maranchie, Jodi K" uniqKey="Maranchie J" first="Jodi K" last="Maranchie">Jodi K. Maranchie</name><affiliation><nlm:aff id="A1">Department of Urology; University of Pittsburgh School of Medicine; Shadyside Medical Center; Pittsburgh, PA USA</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Prostate and Urological Cancers Program; University of Pittsburgh Cancer Institute; Pittsburgh, PA USA</nlm:aff></affiliation></author><author><name sortKey="Pilch, Jan" sort="Pilch, Jan" uniqKey="Pilch J" first="Jan" last="Pilch">Jan Pilch</name><affiliation><nlm:aff id="A1">Department of Urology; University of Pittsburgh School of Medicine; Shadyside Medical Center; Pittsburgh, PA USA</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Prostate and Urological Cancers Program; University of Pittsburgh Cancer Institute; Pittsburgh, PA USA</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">24701372</idno><idno type="pmc">3961483</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3961483</idno><idno type="RBID">PMC:3961483</idno><idno type="doi">10.4161/onci.27338</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">000706</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000706</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Invadopodia formation in blood clots</title><author><name sortKey="Knowles, Lynn M" sort="Knowles, Lynn M" uniqKey="Knowles L" first="Lynn M" last="Knowles">Lynn M. Knowles</name><affiliation><nlm:aff id="A1">Department of Urology; University of Pittsburgh School of Medicine; Shadyside Medical Center; Pittsburgh, PA USA</nlm:aff></affiliation></author><author><name sortKey="Maranchie, Jodi K" sort="Maranchie, Jodi K" uniqKey="Maranchie J" first="Jodi K" last="Maranchie">Jodi K. Maranchie</name><affiliation><nlm:aff id="A1">Department of Urology; University of Pittsburgh School of Medicine; Shadyside Medical Center; Pittsburgh, PA USA</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Prostate and Urological Cancers Program; University of Pittsburgh Cancer Institute; Pittsburgh, PA USA</nlm:aff></affiliation></author><author><name sortKey="Pilch, Jan" sort="Pilch, Jan" uniqKey="Pilch J" first="Jan" last="Pilch">Jan Pilch</name><affiliation><nlm:aff id="A1">Department of Urology; University of Pittsburgh School of Medicine; Shadyside Medical Center; Pittsburgh, PA USA</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Prostate and Urological Cancers Program; University of Pittsburgh Cancer Institute; Pittsburgh, PA USA</nlm:aff></affiliation></author></analytic><series><title level="j">Oncoimmunology</title><idno type="ISSN">2162-4011</idno><idno type="eISSN">2162-402X</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Blood clotting specifically supports the metastatic dissemination of malignant cells to the lung. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Oncoimmunology</journal-id><journal-id journal-id-type="iso-abbrev">Oncoimmunology</journal-id><journal-id journal-id-type="publisher-id">ONCI</journal-id><journal-title-group><journal-title>Oncoimmunology</journal-title></journal-title-group><issn pub-type="ppub">2162-4011</issn><issn pub-type="epub">2162-402X</issn><publisher><publisher-name>Landes Bioscience</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">24701372</article-id><article-id pub-id-type="pmc">3961483</article-id><article-id pub-id-type="publisher-id">2013ONCOIMM0336</article-id><article-id pub-id-type="doi">10.4161/onci.27338</article-id><article-id pub-id-type="pii">27338</article-id><article-categories><subj-group subj-group-type="heading"><subject>Author's View</subject></subj-group></article-categories><title-group><article-title>Invadopodia formation in blood clots</article-title><subtitle>Not so SLUGgish after all</subtitle></title-group><contrib-group><contrib contrib-type="author"><name><surname>Knowles</surname><given-names>Lynn M</given-names></name><xref ref-type="aff" rid="A1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Maranchie</surname><given-names>Jodi K</given-names></name><xref ref-type="aff" rid="A1"><sup>1</sup></xref><xref ref-type="aff" rid="A2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Pilch</surname><given-names>Jan</given-names></name><xref ref-type="aff" rid="A1"><sup>1</sup></xref><xref ref-type="aff" rid="A2"><sup>2</sup></xref><xref ref-type="corresp" rid="cor1">*</xref></contrib><aff id="A1"><label>1</label>Department of Urology; University of Pittsburgh School of Medicine; Shadyside Medical Center; Pittsburgh, PA USA</aff><aff id="A2"><label>2</label>Prostate and Urological Cancers Program; University of Pittsburgh Cancer Institute; Pittsburgh, PA USA</aff></contrib-group><author-notes><corresp id="cor1"><label>*</label>Correspondence to: Jan Pilch, Email: <email xlink:href="pilchj@upmc.edu">pilchj@upmc.edu</email></corresp></author-notes><pub-date pub-type="collection"><year>2014</year></pub-date><pub-date pub-type="epub"><day>01</day><month>1</month><year>2014</year></pub-date><pub-date pub-type="pmc-release"><day>01</day><month>1</month><year>2014</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on the
<volume>3</volume><elocation-id>e27338</elocation-id><history><date date-type="received"><day>23</day><month>11</month><year>2013</year></date><date date-type="accepted"><day>25</day><month>11</month><year>2013</year></date></history><permissions><copyright-statement>Copyright © 2014 Landes Bioscience</copyright-statement><copyright-year>2014</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc/3.0/"><license-p>This is an open-access article licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. The article may be redistributed, reproduced, and reused for non-commercial purposes, provided the original source is properly cited.</license-p></license></permissions><abstract><p>Blood clotting specifically supports the metastatic dissemination of malignant cells to the lung. We have recently demonstrated that 2 tumor types that are prone to form lung metastases, renal cell carcinoma and soft tissue sarcoma, share specific adhesive mechanisms that support the invasion and colonization of blood clots in the pulmonary vasculature.</p></abstract><kwd-group kwd-group-type="author"><title>Keywords: </title><kwd>SLUG</kwd><kwd>fibrin</kwd><kwd>fibronectin</kwd><kwd>integrin αvβ3</kwd><kwd>metastasis</kwd></kwd-group></article-meta></front><body><p>Blood clotting is a critical step during the metastatic dissemination of malignant cells, as it protects them from the cytotoxic activity of circulating immune cells.<xref rid="R1" ref-type="bibr"><sup>1</sup></xref> In addition, thrombi have been shown to support the epithelial-mesenchymal transition, promote the transmigration, and sustain the colony-forming activity of blood-borne cancer cells.<xref rid="R2" ref-type="bibr"><sup>2</sup></xref><sup>-</sup><xref rid="R4" ref-type="bibr"><sup>4</sup></xref> In line with this notion, the metastatic potential of several tumors is strongly reduced in transgenic mice that exhibit defects in blood coagulation or platelet activation.<xref rid="R1" ref-type="bibr"><sup>1</sup></xref> Interestingly, the formation of thrombi has been shown to specifically support the metastatic colonization of lungs but has no apparent effects on the dissemination of malignant cells to the liver.<xref rid="R5" ref-type="bibr"><sup>5</sup></xref> This difference could originate from the specialized structure of pulmonary blood vessels, which, unlike their hepatic counterparts, are lined with a tight layer of endothelium to avoid fluid leakage into the alveolar space.<xref rid="R6" ref-type="bibr"><sup>6</sup></xref><sup>,</sup><xref rid="R7" ref-type="bibr"><sup>7</sup></xref> Thus, the metastatic colonization of the lungs depends on specific factors that induce the retraction of the endothelium and promote cancer cell extravasation, such as angiopoietin-like 4 (ANGPTL4).<xref rid="R7" ref-type="bibr"><sup>7</sup></xref> Interestingly, the formation of clots around blood-borne cancer cells serves a similar purpose, mediating endothelial retraction through platelet-secreted ATP.<xref rid="R4" ref-type="bibr"><sup>4</sup></xref> Additional clot components, such as fibrin and fibronectin, have been shown to promote the activation of integrins, causing malignant cells to generate long, axon-like invadopodia as a means to penetrate the clot and navigate the narrow inter-endothelial spaces of the pulmonary vasculature.<xref rid="R5" ref-type="bibr"><sup>5</sup></xref></p><p>To follow up on the question whether clot formation is relevant for the metastatic colonization of the lungs, we focused on renal cell carcinoma (RCC) and soft tissue sarcoma (STS), mostly because these 2 tumor types are known to metastasize predominantly to the lung.<xref rid="R8" ref-type="bibr"><sup>8</sup></xref> Upon intravenous injection into mice, RCC and STS cells lodge into the lung vasculature, where they become surrounded by fibrin. This mechanism is important for lung colonization because co-injecting the anticoagulant hirudin significantly reduced experimental lung invasion by STS cells. To further analyze the role of blood clotting in lung metastasis, we embedded a panel of RCC and STS cell lines into a 3 dimensional matrix of clotted plasma, side by side with malignant cell lines that predominantly metastasize to other organs such as the liver or bone (i.e., melanoma, breast, prostate, and pancreatic cancer cells). Inspection by phase contrast microscopy revealed a stark difference in cell morphology: while clot-embedded RCC and STS cells developed a spread phenotype with extensive invadopodia, the overwhelming majority of melanoma, breast, prostate, and pancreatic cancer cells maintained their initial, roundish shape. This discrepancy in invadopodia formation was not due to a general inability to invade tissues, as a majority of non-clot invasive tumor cells display a normal metastatic potential. Moreover, the capacity of RCC and STS cells to generate invadopodia proved to be specific for clotted plasma or its main component fibrin, both of which were much more permissive for cell spreading than matrigel.</p><p>Studying transgenic mice lacking plasma fibronectin, we have recently demonstrated that fibrin-fibronectin complexes promote the activation of integrin αvβ3 and that this mechanism correlates with clot invasion and lung metastasis.<xref rid="R5" ref-type="bibr"><sup>5</sup></xref> While plasma fibronectin was not necessary for RCC and STS cells to generate invadopodia in fibrin, we found that these cells expressed a constitutively active form of integrin αvβ3 and that knocking down the β3 subunit markedly reduced invadopodia formation, fibrin invasion, as well as lung colonization. To further elucidate the function of integrin αvβ3 in this setting, we tested fibronectin matrix formation, which has been shown to depend on integrin activation.<xref rid="R9" ref-type="bibr"><sup>9</sup></xref> We detected elaborate fibronectin meshworks in STS and RCC cells, whereas non-clot invasive cell lines as well as RCC cells depleted of integrin β3 by RNA interference lacked the capacity to form a fibronectin matrix. The interaction between integrin β3 and fibronectin, in turn, turned out to be critical for the formation of stress fibers, suggesting that the binding of integrin αvβ3 to fibrin alone does not provide the tensile strength to sustain actomyosin contraction. The formation of stress fibers is a prerequisite for the maturation of focal adhesions, large signaling hubs that promote cell invasion, survival and proliferation.<xref rid="R10" ref-type="bibr"><sup>10</sup></xref> In line with this notion, we demonstrated that both integrin β3 and fibronectin are necessary for invadopodia and colony formation by cancer cells in fibrin. Moreover, we found that integrin αvβ3 and fibronectin cooperate in maintaining high expression levels of snail family zinc finger 2 (SNAI2, best known as SLUG), which is relevant for invadopodia formation in vitro and lung colonization in vivo.</p><p>Together, our data define a mechanism that could explain the propensity of RCC and STS cells for lung colonization (<xref ref-type="fig" rid="F1">Fig. 1</xref>). This mechanism is based on the specialized interaction of these cells with blood clot and depends on activated integrin αvβ3 as well as fibronectin, which together support the formation of stress fibers and the expression of SLUG. In turn, SLUG promotes clot invasion and metastatic dissemination into the lung. Interestingly, this model is also operational in a clinical setting. Indeed, SLUG expression, clot invasion and fibronectin matrix formation are hallmarks of primary cancer cells from RCC patients with lung metastases. Taken together, our data indicate that SLUG is a marker for metastatic RCC. Moreover, they suggest that inhibiting fibrin or stress fiber formation could represent a valuable strategy for the prevention and treatment of metastatic RCC and STS.</p><fig id="F1" fig-type="figure" orientation="portrait" position="float"><caption><p><bold>Figure 1.</bold> Role of integrin αvβ3 in lung colonization by cancer cells. Activated integrin αvβ3 on renal cell carcinoma (RCC) and soft tissue sarcoma (STS) cells facilitates their binding to blood clots. This in turn sustains the formation of invadopodia along with the assembly of an elaborate fibronectin (FN) matrix, the formation of actin stress fibers and upregulation of snail family zinc finger 2 (SNAI2), best known as SLUG. Altogether, these factors contribute to the metastatic colonization of the lung by malignant cells.</p></caption><graphic xlink:href="onci-3-e27338-g1"></graphic></fig></body><back><ack><title>Disclosure of Potential Conflicts of Interest</title><p>No potential conflicts of interest were disclosed.</p></ack><fn-group><fn fn-type="other"><p>Previously published online: <ext-link ext-link-type="uri" xlink:href="http://www.landesbioscience.com/journals/oncoimmunology/article/27338/">www.landesbioscience.com/journals/oncoimmunology/article/27338</ext-link></p></fn></fn-group><notes><p>Citation: Knowles LM, Maranchie JK, Pilch J. Invadopodia formation in blood clots: Not so SLUGgish after all. 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