Inhibitory role of peroxisome proliferator‐activated receptor gamma in hepatocarcinogenesis in mice and in vitro

Although peroxisome proliferator‐activated receptor gamma (PPARγ) agonist have been shown to inhibit hepatocellular carcinoma (HCC) development, the role of PPARγ in hepatocarcinogenesis remains unclear. We investigated the therapeutic efficacy of PPARγ against HCC. PPARγ‐deficient (PPARγ+/−) and wi...

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Veröffentlicht in:Hepatology (Baltimore, Md.) Md.), 2010-06, Vol.51 (6), p.2008-2019
Hauptverfasser: Yu, Jun, Shen, Bo, Chu, Eagle S. H., Teoh, Narci, Cheung, Kin‐Fai, Wu, Chung‐Wah, Wang, Shiyan, Lam, Cleo N. Y., Feng, Hai, Zhao, Junhong, Cheng, Alfred S. L., To, Ka‐Fai, Chan, Henry L. Y., Sung, Joseph J. Y.
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container_end_page 2019
container_issue 6
container_start_page 2008
container_title Hepatology (Baltimore, Md.)
container_volume 51
creator Yu, Jun
Shen, Bo
Chu, Eagle S. H.
Teoh, Narci
Cheung, Kin‐Fai
Wu, Chung‐Wah
Wang, Shiyan
Lam, Cleo N. Y.
Feng, Hai
Zhao, Junhong
Cheng, Alfred S. L.
To, Ka‐Fai
Chan, Henry L. Y.
Sung, Joseph J. Y.
description Although peroxisome proliferator‐activated receptor gamma (PPARγ) agonist have been shown to inhibit hepatocellular carcinoma (HCC) development, the role of PPARγ in hepatocarcinogenesis remains unclear. We investigated the therapeutic efficacy of PPARγ against HCC. PPARγ‐deficient (PPARγ+/−) and wild‐type (PPARγ+/+) littermates were used in a diethylnitrosamine (DEN)‐induced HCC model and treated with PPARγ agonist (rosiglitazone) or the vehicle alone for 8 months. The effects of PPARγ on HCC cell growth and apoptosis were examined using PPARγ‐expressing adenovirus (Ad‐PPARγ). PPARγ+/− mice were more susceptible to DEN‐induced HCC than PPARγ+/+ mice (94% versus 62%, P < 0.05), and rosiglitazone significantly reduced the incidence of HCC in PPARγ+/+ mice (vehicle 62% versus treatment 24%, P < 0.01), but not in PPARγ+/− mice, indicating that PPARγ suppresses hepatocellular carcinogenesis. A pronounced expression of PPARγ was observed in a HCC cell line (Hep3B) infected with Ad‐PPARγ. Such induction markedly suppressed HCC cell viability (P < 0.01). Further, Hep3B infection with Ad‐PPARγ revealed a decreased proportion of cells in S‐phase (12.92% versus 11.58%, P < 0.05), with arrest at G2/M phase (38.2% versus 55.68%, P < 0.001), and there was concomitant phosphorylation of the key G2/M phase inhibitors cdc25C and cdc2. PPARγ overexpression increased cell apoptosis (21.47% versus 35.02%, P < 0.01), mediated by both extrinsic (Fas and tumor necrosis factor‐α) and intrinsic (caspase‐9, caspase‐3, caspase‐7, and poly[ADP‐ribose] polymerase) pathways. Moreover, PPARγ directly induced a putative tumor suppressor gene, growth differentiation factor‐15. Conclusion: Loss of one PPARγ allele is sufficient to enhance susceptibility to HCC. PPARγ suppresses tumor cell growth through reducing cell proliferation and inducing G2/M phase arrest, apoptosis, and up‐regulating growth differentiation factor‐15. Thus, PPARγ acts as a tumor‐suppressor gene in the liver. HEPATOLOGY 2010
doi_str_mv 10.1002/hep.23550
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H. ; Teoh, Narci ; Cheung, Kin‐Fai ; Wu, Chung‐Wah ; Wang, Shiyan ; Lam, Cleo N. Y. ; Feng, Hai ; Zhao, Junhong ; Cheng, Alfred S. L. ; To, Ka‐Fai ; Chan, Henry L. Y. ; Sung, Joseph J. Y.</creator><creatorcontrib>Yu, Jun ; Shen, Bo ; Chu, Eagle S. H. ; Teoh, Narci ; Cheung, Kin‐Fai ; Wu, Chung‐Wah ; Wang, Shiyan ; Lam, Cleo N. Y. ; Feng, Hai ; Zhao, Junhong ; Cheng, Alfred S. L. ; To, Ka‐Fai ; Chan, Henry L. Y. ; Sung, Joseph J. Y.</creatorcontrib><description><![CDATA[Although peroxisome proliferator‐activated receptor gamma (PPARγ) agonist have been shown to inhibit hepatocellular carcinoma (HCC) development, the role of PPARγ in hepatocarcinogenesis remains unclear. We investigated the therapeutic efficacy of PPARγ against HCC. PPARγ‐deficient (PPARγ+/−) and wild‐type (PPARγ+/+) littermates were used in a diethylnitrosamine (DEN)‐induced HCC model and treated with PPARγ agonist (rosiglitazone) or the vehicle alone for 8 months. The effects of PPARγ on HCC cell growth and apoptosis were examined using PPARγ‐expressing adenovirus (Ad‐PPARγ). PPARγ+/− mice were more susceptible to DEN‐induced HCC than PPARγ+/+ mice (94% versus 62%, P < 0.05), and rosiglitazone significantly reduced the incidence of HCC in PPARγ+/+ mice (vehicle 62% versus treatment 24%, P < 0.01), but not in PPARγ+/− mice, indicating that PPARγ suppresses hepatocellular carcinogenesis. A pronounced expression of PPARγ was observed in a HCC cell line (Hep3B) infected with Ad‐PPARγ. Such induction markedly suppressed HCC cell viability (P < 0.01). Further, Hep3B infection with Ad‐PPARγ revealed a decreased proportion of cells in S‐phase (12.92% versus 11.58%, P < 0.05), with arrest at G2/M phase (38.2% versus 55.68%, P < 0.001), and there was concomitant phosphorylation of the key G2/M phase inhibitors cdc25C and cdc2. PPARγ overexpression increased cell apoptosis (21.47% versus 35.02%, P < 0.01), mediated by both extrinsic (Fas and tumor necrosis factor‐α) and intrinsic (caspase‐9, caspase‐3, caspase‐7, and poly[ADP‐ribose] polymerase) pathways. Moreover, PPARγ directly induced a putative tumor suppressor gene, growth differentiation factor‐15. Conclusion: Loss of one PPARγ allele is sufficient to enhance susceptibility to HCC. PPARγ suppresses tumor cell growth through reducing cell proliferation and inducing G2/M phase arrest, apoptosis, and up‐regulating growth differentiation factor‐15. Thus, PPARγ acts as a tumor‐suppressor gene in the liver. HEPATOLOGY 2010]]></description><identifier>ISSN: 0270-9139</identifier><identifier>EISSN: 1527-3350</identifier><identifier>DOI: 10.1002/hep.23550</identifier><identifier>PMID: 20512989</identifier><identifier>CODEN: HPTLD9</identifier><language>eng</language><publisher>Hoboken: Wiley Subscription Services, Inc., A Wiley Company</publisher><subject>Adenoviridae ; Adenovirus ; Alkylating Agents ; Animals ; Apoptosis ; Biological and medical sciences ; Carcinoma, Hepatocellular - genetics ; Carcinoma, Hepatocellular - metabolism ; Carcinoma, Hepatocellular - prevention &amp; control ; Cell Cycle ; Cell growth ; Cell Line, Tumor ; Cell Proliferation ; Diethylnitrosamine ; Gastroenterology. Liver. Pancreas. Abdomen ; Gene Expression Profiling ; Genes ; Growth Differentiation Factor 15 - metabolism ; Hepatology ; Humans ; Hypoglycemic Agents - therapeutic use ; Liver Neoplasms, Experimental - genetics ; Liver Neoplasms, Experimental - metabolism ; Liver Neoplasms, Experimental - prevention &amp; control ; Liver. Biliary tract. Portal circulation. 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H.</creatorcontrib><creatorcontrib>Teoh, Narci</creatorcontrib><creatorcontrib>Cheung, Kin‐Fai</creatorcontrib><creatorcontrib>Wu, Chung‐Wah</creatorcontrib><creatorcontrib>Wang, Shiyan</creatorcontrib><creatorcontrib>Lam, Cleo N. Y.</creatorcontrib><creatorcontrib>Feng, Hai</creatorcontrib><creatorcontrib>Zhao, Junhong</creatorcontrib><creatorcontrib>Cheng, Alfred S. L.</creatorcontrib><creatorcontrib>To, Ka‐Fai</creatorcontrib><creatorcontrib>Chan, Henry L. Y.</creatorcontrib><creatorcontrib>Sung, Joseph J. Y.</creatorcontrib><title>Inhibitory role of peroxisome proliferator‐activated receptor gamma in hepatocarcinogenesis in mice and in vitro</title><title>Hepatology (Baltimore, Md.)</title><addtitle>Hepatology</addtitle><description><![CDATA[Although peroxisome proliferator‐activated receptor gamma (PPARγ) agonist have been shown to inhibit hepatocellular carcinoma (HCC) development, the role of PPARγ in hepatocarcinogenesis remains unclear. We investigated the therapeutic efficacy of PPARγ against HCC. PPARγ‐deficient (PPARγ+/−) and wild‐type (PPARγ+/+) littermates were used in a diethylnitrosamine (DEN)‐induced HCC model and treated with PPARγ agonist (rosiglitazone) or the vehicle alone for 8 months. The effects of PPARγ on HCC cell growth and apoptosis were examined using PPARγ‐expressing adenovirus (Ad‐PPARγ). PPARγ+/− mice were more susceptible to DEN‐induced HCC than PPARγ+/+ mice (94% versus 62%, P < 0.05), and rosiglitazone significantly reduced the incidence of HCC in PPARγ+/+ mice (vehicle 62% versus treatment 24%, P < 0.01), but not in PPARγ+/− mice, indicating that PPARγ suppresses hepatocellular carcinogenesis. A pronounced expression of PPARγ was observed in a HCC cell line (Hep3B) infected with Ad‐PPARγ. Such induction markedly suppressed HCC cell viability (P < 0.01). Further, Hep3B infection with Ad‐PPARγ revealed a decreased proportion of cells in S‐phase (12.92% versus 11.58%, P < 0.05), with arrest at G2/M phase (38.2% versus 55.68%, P < 0.001), and there was concomitant phosphorylation of the key G2/M phase inhibitors cdc25C and cdc2. PPARγ overexpression increased cell apoptosis (21.47% versus 35.02%, P < 0.01), mediated by both extrinsic (Fas and tumor necrosis factor‐α) and intrinsic (caspase‐9, caspase‐3, caspase‐7, and poly[ADP‐ribose] polymerase) pathways. Moreover, PPARγ directly induced a putative tumor suppressor gene, growth differentiation factor‐15. Conclusion: Loss of one PPARγ allele is sufficient to enhance susceptibility to HCC. PPARγ suppresses tumor cell growth through reducing cell proliferation and inducing G2/M phase arrest, apoptosis, and up‐regulating growth differentiation factor‐15. Thus, PPARγ acts as a tumor‐suppressor gene in the liver. HEPATOLOGY 2010]]></description><subject>Adenoviridae</subject><subject>Adenovirus</subject><subject>Alkylating Agents</subject><subject>Animals</subject><subject>Apoptosis</subject><subject>Biological and medical sciences</subject><subject>Carcinoma, Hepatocellular - genetics</subject><subject>Carcinoma, Hepatocellular - metabolism</subject><subject>Carcinoma, Hepatocellular - prevention &amp; control</subject><subject>Cell Cycle</subject><subject>Cell growth</subject><subject>Cell Line, Tumor</subject><subject>Cell Proliferation</subject><subject>Diethylnitrosamine</subject><subject>Gastroenterology. Liver. Pancreas. 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Abdomen</topic><topic>Gene Expression Profiling</topic><topic>Genes</topic><topic>Growth Differentiation Factor 15 - metabolism</topic><topic>Hepatology</topic><topic>Humans</topic><topic>Hypoglycemic Agents - therapeutic use</topic><topic>Liver Neoplasms, Experimental - genetics</topic><topic>Liver Neoplasms, Experimental - metabolism</topic><topic>Liver Neoplasms, Experimental - prevention &amp; control</topic><topic>Liver. Biliary tract. Portal circulation. 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We investigated the therapeutic efficacy of PPARγ against HCC. PPARγ‐deficient (PPARγ+/−) and wild‐type (PPARγ+/+) littermates were used in a diethylnitrosamine (DEN)‐induced HCC model and treated with PPARγ agonist (rosiglitazone) or the vehicle alone for 8 months. The effects of PPARγ on HCC cell growth and apoptosis were examined using PPARγ‐expressing adenovirus (Ad‐PPARγ). PPARγ+/− mice were more susceptible to DEN‐induced HCC than PPARγ+/+ mice (94% versus 62%, P < 0.05), and rosiglitazone significantly reduced the incidence of HCC in PPARγ+/+ mice (vehicle 62% versus treatment 24%, P < 0.01), but not in PPARγ+/− mice, indicating that PPARγ suppresses hepatocellular carcinogenesis. A pronounced expression of PPARγ was observed in a HCC cell line (Hep3B) infected with Ad‐PPARγ. Such induction markedly suppressed HCC cell viability (P < 0.01). Further, Hep3B infection with Ad‐PPARγ revealed a decreased proportion of cells in S‐phase (12.92% versus 11.58%, P < 0.05), with arrest at G2/M phase (38.2% versus 55.68%, P < 0.001), and there was concomitant phosphorylation of the key G2/M phase inhibitors cdc25C and cdc2. PPARγ overexpression increased cell apoptosis (21.47% versus 35.02%, P < 0.01), mediated by both extrinsic (Fas and tumor necrosis factor‐α) and intrinsic (caspase‐9, caspase‐3, caspase‐7, and poly[ADP‐ribose] polymerase) pathways. Moreover, PPARγ directly induced a putative tumor suppressor gene, growth differentiation factor‐15. Conclusion: Loss of one PPARγ allele is sufficient to enhance susceptibility to HCC. PPARγ suppresses tumor cell growth through reducing cell proliferation and inducing G2/M phase arrest, apoptosis, and up‐regulating growth differentiation factor‐15. Thus, PPARγ acts as a tumor‐suppressor gene in the liver. HEPATOLOGY 2010]]></abstract><cop>Hoboken</cop><pub>Wiley Subscription Services, Inc., A Wiley Company</pub><pmid>20512989</pmid><doi>10.1002/hep.23550</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record>
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subjects Adenoviridae
Adenovirus
Alkylating Agents
Animals
Apoptosis
Biological and medical sciences
Carcinoma, Hepatocellular - genetics
Carcinoma, Hepatocellular - metabolism
Carcinoma, Hepatocellular - prevention & control
Cell Cycle
Cell growth
Cell Line, Tumor
Cell Proliferation
Diethylnitrosamine
Gastroenterology. Liver. Pancreas. Abdomen
Gene Expression Profiling
Genes
Growth Differentiation Factor 15 - metabolism
Hepatology
Humans
Hypoglycemic Agents - therapeutic use
Liver Neoplasms, Experimental - genetics
Liver Neoplasms, Experimental - metabolism
Liver Neoplasms, Experimental - prevention & control
Liver. Biliary tract. Portal circulation. Exocrine pancreas
Male
Medical sciences
Mice
Mice, Knockout
Oligonucleotide Array Sequence Analysis
PPAR gamma - agonists
PPAR gamma - genetics
PPAR gamma - metabolism
Thiazolidinediones - therapeutic use
Tumors
Up-Regulation
title Inhibitory role of peroxisome proliferator‐activated receptor gamma in hepatocarcinogenesis in mice and in vitro
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