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Article: Competitive Binding Between Id1 and E2F1 to Cdc20 Regulates E2F1 Degradation and Thymidylate Synthase Expression to Promote Esophageal Cancer Chemoresistance

TitleCompetitive Binding Between Id1 and E2F1 to Cdc20 Regulates E2F1 Degradation and Thymidylate Synthase Expression to Promote Esophageal Cancer Chemoresistance
Authors
Issue Date2016
PublisherAmerican Association for Cancer Research. The Journal's web site is located at http://clincancerres.aacrjournals.org/
Citation
Clinical Cancer Research, 2016, v. 22 n. 5, p. 1243-1255 How to Cite?
AbstractPurpose: Chemoresistance is a major obstacle in cancer therapy. We found that fluorouracil (5-FU)-resistant esophageal squamous cell carcinoma cell lines, established through exposure to increasing concentrations of 5-FU, showed upregulation of Id1, IGF2, and E2F1. We hypothesized that these genes may play an important role in cancer chemoresistance. Experimental Design: In vitro and in vivo functional assays were performed to study the effects of Id1–E2F1–IGF2 signaling in chemoresistance. Quantitative real-time PCR, Western blotting, immunoprecipitation, chromatin immunoprecipitation, and dual-luciferase reporter assays were used to investigate the molecular mechanisms by which Id1 regulates E2F1 and by which E2F1 regulates IGF2. Clinical specimens, tumor tissue microarray, and Gene Expression Omnibus datasets were used to analyze the correlations between gene expressions and the relationships between expression profiles and patient survival outcomes. Results: Id1 conferred 5-FU chemoresistance through E2F1-dependent induction of thymidylate synthase expression in esophageal cancer cells and tumor xenografts. Mechanistically, Id1 protects E2F1 protein from degradation and increases its expression by binding competitively to Cdc20, whereas E2F1 mediates Id1-induced upregulation of IGF2 by binding directly to the IGF2 promoter and activating its transcription. The expression level of E2F1 was positively correlated with that of Id1 and IGF2 in human cancers. More importantly, concurrent high expression of Id1 and IGF2 was associated with unfavorable patient survival in multiple cancer types. Conclusions: Our findings define an intricate E2F1-dependent mechanism by which Id1 increases thymidylate synthase and IGF2 expressions to promote cancer chemoresistance. The Id1–E2F1–IGF2 regulatory axis has important implications for cancer prognosis and treatment. ©2015 AACR.
Persistent Identifierhttp://hdl.handle.net/10722/223817
ISSN
2015 Impact Factor: 8.738
2015 SCImago Journal Rankings: 5.314

 

DC FieldValueLanguage
dc.contributor.authorLi, B-
dc.contributor.authorXu, W-
dc.contributor.authorGuan, X-
dc.contributor.authorQin, YR-
dc.contributor.authorLaw, SYK-
dc.contributor.authorLee, NPY-
dc.contributor.authorChan, KT-
dc.contributor.authorTam, PY-
dc.contributor.authorLi, YY-
dc.contributor.authorChan, KW-
dc.contributor.authorYuen, HF-
dc.contributor.authorTsao, GSW-
dc.contributor.authorHe, QY-
dc.contributor.authorCheung, A-
dc.date.accessioned2016-03-18T02:29:35Z-
dc.date.available2016-03-18T02:29:35Z-
dc.date.issued2016-
dc.identifier.citationClinical Cancer Research, 2016, v. 22 n. 5, p. 1243-1255-
dc.identifier.issn1078-0432-
dc.identifier.urihttp://hdl.handle.net/10722/223817-
dc.description.abstractPurpose: Chemoresistance is a major obstacle in cancer therapy. We found that fluorouracil (5-FU)-resistant esophageal squamous cell carcinoma cell lines, established through exposure to increasing concentrations of 5-FU, showed upregulation of Id1, IGF2, and E2F1. We hypothesized that these genes may play an important role in cancer chemoresistance. Experimental Design: In vitro and in vivo functional assays were performed to study the effects of Id1–E2F1–IGF2 signaling in chemoresistance. Quantitative real-time PCR, Western blotting, immunoprecipitation, chromatin immunoprecipitation, and dual-luciferase reporter assays were used to investigate the molecular mechanisms by which Id1 regulates E2F1 and by which E2F1 regulates IGF2. Clinical specimens, tumor tissue microarray, and Gene Expression Omnibus datasets were used to analyze the correlations between gene expressions and the relationships between expression profiles and patient survival outcomes. Results: Id1 conferred 5-FU chemoresistance through E2F1-dependent induction of thymidylate synthase expression in esophageal cancer cells and tumor xenografts. Mechanistically, Id1 protects E2F1 protein from degradation and increases its expression by binding competitively to Cdc20, whereas E2F1 mediates Id1-induced upregulation of IGF2 by binding directly to the IGF2 promoter and activating its transcription. The expression level of E2F1 was positively correlated with that of Id1 and IGF2 in human cancers. More importantly, concurrent high expression of Id1 and IGF2 was associated with unfavorable patient survival in multiple cancer types. Conclusions: Our findings define an intricate E2F1-dependent mechanism by which Id1 increases thymidylate synthase and IGF2 expressions to promote cancer chemoresistance. The Id1–E2F1–IGF2 regulatory axis has important implications for cancer prognosis and treatment. ©2015 AACR.-
dc.languageeng-
dc.publisherAmerican Association for Cancer Research. The Journal's web site is located at http://clincancerres.aacrjournals.org/-
dc.relation.ispartofClinical Cancer Research-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License-
dc.titleCompetitive Binding Between Id1 and E2F1 to Cdc20 Regulates E2F1 Degradation and Thymidylate Synthase Expression to Promote Esophageal Cancer Chemoresistance-
dc.typeArticle-
dc.identifier.emailLi, B: libinhku@hkucc.hku.hk-
dc.identifier.emailGuan, X: xyguan@hkucc.hku.hk-
dc.identifier.emailLaw, SYK: slaw@hkucc.hku.hk-
dc.identifier.emailLee, NPY: nikkilee@hku.hk-
dc.identifier.emailChan, KT: ktchan66@hku.hk-
dc.identifier.emailLi, YY: yyli@hku.hk-
dc.identifier.emailChan, KW: hrmtckw@hkucc.hku.hk-
dc.identifier.emailTsao, GSW: gswtsao@hku.hk-
dc.identifier.emailCheung, A: lmcheung@hku.hk-
dc.identifier.authorityGuan, X=rp00454-
dc.identifier.authorityLaw, SYK=rp00437-
dc.identifier.authorityLee, NPY=rp00263-
dc.identifier.authorityChan, KW=rp00330-
dc.identifier.authorityTsao, GSW=rp00399-
dc.identifier.authorityCheung, A=rp00332-
dc.description.naturepostprint-
dc.identifier.doi10.1158/1078-0432.CCR-15-1196-
dc.identifier.pmid26475334-
dc.identifier.hkuros257242-
dc.identifier.volume22-
dc.identifier.issue5-
dc.identifier.spage1243-
dc.identifier.epage1255-
dc.publisher.placeUnited States-

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