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A Smad3 and TTF-1/NKX2-1 complex regulates Smad4-independent gene expression
Thyroid transcription factor-1 (TTF-1, also known as NKX2-1) is a tissue-specific transcription factor in lung epithelial cells. Although TTF-1 inhibits the epithelial-to-mesenchymal transition induced by transforming growth factor-β (TGF-β) in lung adenocarcinoma cells, the mechanism through which...
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Published in: | Cell research 2014-08, Vol.24 (8), p.994-1008 |
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description | Thyroid transcription factor-1 (TTF-1, also known as NKX2-1) is a tissue-specific transcription factor in lung epithelial cells. Although TTF-1 inhibits the epithelial-to-mesenchymal transition induced by transforming growth factor-β (TGF-β) in lung adenocarcinoma cells, the mechanism through which TTF-1 inhibits the functions of TGF-β is unknown. Here we show that TTF-1 disrupts the nuclear Smad3-Smad4 complex without affecting the nuclear localization of phospho-Smad3. Genome-wide analysis by chromatin immunoprecipitation followed by sequencing revealed that TTF-1 colocalizes with Smad3 on chromatin and alters Smad3-binding patterns throughout the genome, while TTF-1 generally inhibits Smad4 binding to chromatin. Moreover, Smad3 binds to chromatin together with TTF-1, but not with Smad4, at some Smad3-binding regions when TGF-β signaling is absent, and knockdown of Smad4 expression does not attenuate Smad3 binding in these regions. Thus, TTF-1 may compete with Smad4 for interaction with Smad3, and in the presence of TTF-1, Smad3 regulates the transcription of certain genes independently of Smad4. These findings provide a new model of regulation of TGF-β-Smad signaling by TTF-1. |
doi_str_mv | 10.1038/cr.2014.97 |
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Although TTF-1 inhibits the epithelial-to-mesenchymal transition induced by transforming growth factor-β (TGF-β) in lung adenocarcinoma cells, the mechanism through which TTF-1 inhibits the functions of TGF-β is unknown. Here we show that TTF-1 disrupts the nuclear Smad3-Smad4 complex without affecting the nuclear localization of phospho-Smad3. Genome-wide analysis by chromatin immunoprecipitation followed by sequencing revealed that TTF-1 colocalizes with Smad3 on chromatin and alters Smad3-binding patterns throughout the genome, while TTF-1 generally inhibits Smad4 binding to chromatin. Moreover, Smad3 binds to chromatin together with TTF-1, but not with Smad4, at some Smad3-binding regions when TGF-β signaling is absent, and knockdown of Smad4 expression does not attenuate Smad3 binding in these regions. Thus, TTF-1 may compete with Smad4 for interaction with Smad3, and in the presence of TTF-1, Smad3 regulates the transcription of certain genes independently of Smad4. These findings provide a new model of regulation of TGF-β-Smad signaling by TTF-1.</description><identifier>ISSN: 1001-0602</identifier><identifier>EISSN: 1748-7838</identifier><identifier>DOI: 10.1038/cr.2014.97</identifier><identifier>PMID: 25060702</identifier><language>eng</language><publisher>England: Nature Publishing Group</publisher><subject>Cell Line, Tumor ; Chromatin - metabolism ; Chromatin Immunoprecipitation ; DNA-Binding Proteins - antagonists & inhibitors ; DNA-Binding Proteins - genetics ; DNA-Binding Proteins - metabolism ; Gene Expression - drug effects ; Humans ; Original ; Protein Binding ; RNA Interference ; RNA, Small Interfering - metabolism ; Signal Transduction - drug effects ; Smad3 ; Smad3 Protein - metabolism ; Smad4 ; Smad4 Protein - antagonists & inhibitors ; Smad4 Protein - genetics ; Smad4 Protein - metabolism ; Transcription Factors ; Transforming Growth Factor beta - pharmacology ; 依赖性 ; 基因表达 ; 染色质免疫沉淀 ; 肺上皮细胞 ; 蛋白相互作用 ; 转化生长因子</subject><ispartof>Cell research, 2014-08, Vol.24 (8), p.994-1008</ispartof><rights>Copyright Nature Publishing Group Aug 2014</rights><rights>Copyright © 2014 Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences 2014 Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c565t-3b0ccf5b2a189368f6a395d1f386aa9496d15be5959af6a7d241374f23bc38183</citedby><cites>FETCH-LOGICAL-c565t-3b0ccf5b2a189368f6a395d1f386aa9496d15be5959af6a7d241374f23bc38183</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Uhttp://image.cqvip.com/vip1000/qk/85240X/85240X.jpg</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4123303/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4123303/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,315,733,786,790,891,27957,27958,53827,53829</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/25060702$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Isogaya, Kazunobu</creatorcontrib><creatorcontrib>Koinuma, Daizo</creatorcontrib><creatorcontrib>Tsutsumi, Shuichi</creatorcontrib><creatorcontrib>Saito, Roy-Akira</creatorcontrib><creatorcontrib>Miyazawa, Keiji</creatorcontrib><creatorcontrib>Aburatani, Hiroyuki</creatorcontrib><creatorcontrib>Miyazono, Kohei</creatorcontrib><title>A Smad3 and TTF-1/NKX2-1 complex regulates Smad4-independent gene expression</title><title>Cell research</title><addtitle>Cell Research</addtitle><description>Thyroid transcription factor-1 (TTF-1, also known as NKX2-1) is a tissue-specific transcription factor in lung epithelial cells. Although TTF-1 inhibits the epithelial-to-mesenchymal transition induced by transforming growth factor-β (TGF-β) in lung adenocarcinoma cells, the mechanism through which TTF-1 inhibits the functions of TGF-β is unknown. Here we show that TTF-1 disrupts the nuclear Smad3-Smad4 complex without affecting the nuclear localization of phospho-Smad3. Genome-wide analysis by chromatin immunoprecipitation followed by sequencing revealed that TTF-1 colocalizes with Smad3 on chromatin and alters Smad3-binding patterns throughout the genome, while TTF-1 generally inhibits Smad4 binding to chromatin. Moreover, Smad3 binds to chromatin together with TTF-1, but not with Smad4, at some Smad3-binding regions when TGF-β signaling is absent, and knockdown of Smad4 expression does not attenuate Smad3 binding in these regions. Thus, TTF-1 may compete with Smad4 for interaction with Smad3, and in the presence of TTF-1, Smad3 regulates the transcription of certain genes independently of Smad4. 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China</collection><collection>Genetics Abstracts</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Cell research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Isogaya, Kazunobu</au><au>Koinuma, Daizo</au><au>Tsutsumi, Shuichi</au><au>Saito, Roy-Akira</au><au>Miyazawa, Keiji</au><au>Aburatani, Hiroyuki</au><au>Miyazono, Kohei</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A Smad3 and TTF-1/NKX2-1 complex regulates Smad4-independent gene expression</atitle><jtitle>Cell research</jtitle><addtitle>Cell Research</addtitle><date>2014-08-01</date><risdate>2014</risdate><volume>24</volume><issue>8</issue><spage>994</spage><epage>1008</epage><pages>994-1008</pages><issn>1001-0602</issn><eissn>1748-7838</eissn><notes>Thyroid transcription factor-1 (TTF-1, also known as NKX2-1) is a tissue-specific transcription factor in lung epithelial cells. Although TTF-1 inhibits the epithelial-to-mesenchymal transition induced by transforming growth factor-β (TGF-β) in lung adenocarcinoma cells, the mechanism through which TTF-1 inhibits the functions of TGF-β is unknown. Here we show that TTF-1 disrupts the nuclear Smad3-Smad4 complex without affecting the nuclear localization of phospho-Smad3. Genome-wide analysis by chromatin immunoprecipitation followed by sequencing revealed that TTF-1 colocalizes with Smad3 on chromatin and alters Smad3-binding patterns throughout the genome, while TTF-1 generally inhibits Smad4 binding to chromatin. Moreover, Smad3 binds to chromatin together with TTF-1, but not with Smad4, at some Smad3-binding regions when TGF-β signaling is absent, and knockdown of Smad4 expression does not attenuate Smad3 binding in these regions. Thus, TTF-1 may compete with Smad4 for interaction with Smad3, and in the presence of TTF-1, Smad3 regulates the transcription of certain genes independently of Smad4. These findings provide a new model of regulation of TGF-β-Smad signaling by TTF-1.</notes><notes>31-1568/Q</notes><notes>ChlP-seq; NKX2-1; Smad3; Smad4; TTF- 1; TGF-β</notes><notes>ObjectType-Article-2</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-1</notes><notes>content type line 23</notes><abstract>Thyroid transcription factor-1 (TTF-1, also known as NKX2-1) is a tissue-specific transcription factor in lung epithelial cells. Although TTF-1 inhibits the epithelial-to-mesenchymal transition induced by transforming growth factor-β (TGF-β) in lung adenocarcinoma cells, the mechanism through which TTF-1 inhibits the functions of TGF-β is unknown. Here we show that TTF-1 disrupts the nuclear Smad3-Smad4 complex without affecting the nuclear localization of phospho-Smad3. Genome-wide analysis by chromatin immunoprecipitation followed by sequencing revealed that TTF-1 colocalizes with Smad3 on chromatin and alters Smad3-binding patterns throughout the genome, while TTF-1 generally inhibits Smad4 binding to chromatin. Moreover, Smad3 binds to chromatin together with TTF-1, but not with Smad4, at some Smad3-binding regions when TGF-β signaling is absent, and knockdown of Smad4 expression does not attenuate Smad3 binding in these regions. Thus, TTF-1 may compete with Smad4 for interaction with Smad3, and in the presence of TTF-1, Smad3 regulates the transcription of certain genes independently of Smad4. These findings provide a new model of regulation of TGF-β-Smad signaling by TTF-1.</abstract><cop>England</cop><pub>Nature Publishing Group</pub><pmid>25060702</pmid><doi>10.1038/cr.2014.97</doi><tpages>15</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Cell Line, Tumor Chromatin - metabolism Chromatin Immunoprecipitation DNA-Binding Proteins - antagonists & inhibitors DNA-Binding Proteins - genetics DNA-Binding Proteins - metabolism Gene Expression - drug effects Humans Original Protein Binding RNA Interference RNA, Small Interfering - metabolism Signal Transduction - drug effects Smad3 Smad3 Protein - metabolism Smad4 Smad4 Protein - antagonists & inhibitors Smad4 Protein - genetics Smad4 Protein - metabolism Transcription Factors Transforming Growth Factor beta - pharmacology 依赖性 基因表达 染色质免疫沉淀 肺上皮细胞 蛋白相互作用 转化生长因子 |
title | A Smad3 and TTF-1/NKX2-1 complex regulates Smad4-independent gene expression |
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