Cargando…
Loss of STAT5 causes liver fibrosis and cancer development through increased TGF-β and STAT3 activation
The molecular mechanisms underlying the development of hepatocellular carcinoma are not fully understood. Liver-specific signal transducer and activator of transcription (STAT) 5A/B–null mice (STAT5-LKO) were treated with carbon tetrachloride (CCl(4)), and histological analyses revealed liver fibros...
Autores principales: | , , , , , |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
The Rockefeller University Press
2009
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2715112/ https://www.ncbi.nlm.nih.gov/pubmed/19332876 http://dx.doi.org/10.1084/jem.20080003 |
_version_ | 1782169744207511552 |
---|---|
author | Hosui, Atsushi Kimura, Akiko Yamaji, Daisuke Zhu, Bing-mei Na, Risu Hennighausen, Lothar |
author_facet | Hosui, Atsushi Kimura, Akiko Yamaji, Daisuke Zhu, Bing-mei Na, Risu Hennighausen, Lothar |
author_sort | Hosui, Atsushi |
collection | PubMed |
description | The molecular mechanisms underlying the development of hepatocellular carcinoma are not fully understood. Liver-specific signal transducer and activator of transcription (STAT) 5A/B–null mice (STAT5-LKO) were treated with carbon tetrachloride (CCl(4)), and histological analyses revealed liver fibrosis and tumors. Transforming growth factor (TGF)–β levels and STAT3 activity were elevated in liver tissue from STAT5-LKO mice upon CCl(4) treatment. To define the molecular link between STAT5 silencing and TGF-β up-regulation, as well as STAT3 activation, we examined STAT5-null mouse embryonic fibroblasts and primary hepatocytes. These cells displayed elevated TGF-β protein levels, whereas messenger RNA levels remained almost unchanged. Protease inhibitor studies revealed that STAT5 deficiency enhanced the stability of mature TGF-β. Immunoprecipitation and immunohistochemistry analyses demonstrated that STAT5, through its N-terminal sequences, could bind to TGF-β and that retroviral-mediated overexpression of STAT5 decreased TGF-β levels. To confirm the in vivo significance of the N-terminal domain of STAT5, we treated mice that expressed STAT5 lacking the N terminus (STAT5-ΔN) with CCl(4). STAT5-ΔN mice developed CCl(4)-induced liver fibrosis but no tumors. In conclusion, loss of STAT5 results in elevated TGF-β levels and enhanced growth hormone–induced STAT3 activity. We propose that a deregulated STAT5–TGF-β–STAT3 network contributes to the development of chronic liver disease. |
format | Text |
id | pubmed-2715112 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2009 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-27151122009-10-13 Loss of STAT5 causes liver fibrosis and cancer development through increased TGF-β and STAT3 activation Hosui, Atsushi Kimura, Akiko Yamaji, Daisuke Zhu, Bing-mei Na, Risu Hennighausen, Lothar J Exp Med Article The molecular mechanisms underlying the development of hepatocellular carcinoma are not fully understood. Liver-specific signal transducer and activator of transcription (STAT) 5A/B–null mice (STAT5-LKO) were treated with carbon tetrachloride (CCl(4)), and histological analyses revealed liver fibrosis and tumors. Transforming growth factor (TGF)–β levels and STAT3 activity were elevated in liver tissue from STAT5-LKO mice upon CCl(4) treatment. To define the molecular link between STAT5 silencing and TGF-β up-regulation, as well as STAT3 activation, we examined STAT5-null mouse embryonic fibroblasts and primary hepatocytes. These cells displayed elevated TGF-β protein levels, whereas messenger RNA levels remained almost unchanged. Protease inhibitor studies revealed that STAT5 deficiency enhanced the stability of mature TGF-β. Immunoprecipitation and immunohistochemistry analyses demonstrated that STAT5, through its N-terminal sequences, could bind to TGF-β and that retroviral-mediated overexpression of STAT5 decreased TGF-β levels. To confirm the in vivo significance of the N-terminal domain of STAT5, we treated mice that expressed STAT5 lacking the N terminus (STAT5-ΔN) with CCl(4). STAT5-ΔN mice developed CCl(4)-induced liver fibrosis but no tumors. In conclusion, loss of STAT5 results in elevated TGF-β levels and enhanced growth hormone–induced STAT3 activity. We propose that a deregulated STAT5–TGF-β–STAT3 network contributes to the development of chronic liver disease. The Rockefeller University Press 2009-04-13 /pmc/articles/PMC2715112/ /pubmed/19332876 http://dx.doi.org/10.1084/jem.20080003 Text en © 2009 The Rockefeller University Press 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 http://www.jem.org/misc/terms.shtml). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/). |
spellingShingle | Article Hosui, Atsushi Kimura, Akiko Yamaji, Daisuke Zhu, Bing-mei Na, Risu Hennighausen, Lothar Loss of STAT5 causes liver fibrosis and cancer development through increased TGF-β and STAT3 activation |
title | Loss of STAT5 causes liver fibrosis and cancer development through increased TGF-β and STAT3 activation |
title_full | Loss of STAT5 causes liver fibrosis and cancer development through increased TGF-β and STAT3 activation |
title_fullStr | Loss of STAT5 causes liver fibrosis and cancer development through increased TGF-β and STAT3 activation |
title_full_unstemmed | Loss of STAT5 causes liver fibrosis and cancer development through increased TGF-β and STAT3 activation |
title_short | Loss of STAT5 causes liver fibrosis and cancer development through increased TGF-β and STAT3 activation |
title_sort | loss of stat5 causes liver fibrosis and cancer development through increased tgf-β and stat3 activation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2715112/ https://www.ncbi.nlm.nih.gov/pubmed/19332876 http://dx.doi.org/10.1084/jem.20080003 |
work_keys_str_mv | AT hosuiatsushi lossofstat5causesliverfibrosisandcancerdevelopmentthroughincreasedtgfbandstat3activation AT kimuraakiko lossofstat5causesliverfibrosisandcancerdevelopmentthroughincreasedtgfbandstat3activation AT yamajidaisuke lossofstat5causesliverfibrosisandcancerdevelopmentthroughincreasedtgfbandstat3activation AT zhubingmei lossofstat5causesliverfibrosisandcancerdevelopmentthroughincreasedtgfbandstat3activation AT narisu lossofstat5causesliverfibrosisandcancerdevelopmentthroughincreasedtgfbandstat3activation AT hennighausenlothar lossofstat5causesliverfibrosisandcancerdevelopmentthroughincreasedtgfbandstat3activation |