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Abstract 84: E2F8 tumor suppressive role in Non-Alcoholic Steatohepatitis. Cancer Res 2020. [DOI: 10.1158/1538-7445.am2020-84] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Non-Alcoholic Steatohepatitis (NASH) is the aggressive form of Non-Alcoholic Fatty Liver Disease (NAFLD). NAFLD is the accumulation of extra fat in liver cells, most commonly known as fatty liver. Some of the main conditions that distinguish NAFLD from NASH are severe liver inflammation, increased lipid accumulation and fibrosis. NASH is caused by an excess of fat in the liver which is linked to obesity and diet. Diets high in fats and sugars, typical of a Western diet, have been shown to induce NASH. Approximately 25% of NASH cases progress to Hepatocellular Carcinoma (HCC). Currently, there is no approved therapy for NASH and complications due to NASH is estimated to be the main reason for liver transplant. E2F8, a member of a family of transcription factors that are well known for regulating the cell cycle, has been shown to promote hepatic steatosis in a zebrafish model. Previous research from our lab has demonstrated that E2F8 has a tumor-suppressive role and loss of E2F8 leads to HCC in a carcinogen-induced model. Here, we use a mouse model to conditionally delete E2f8 in hepatocytes to sensitize to liver cancer and evaluate the effects of E2F8 on NASH development. Mice were fed with a low-fat diet (LFD), high-fat diet (HFD), choline-deficient high-fat diet (CDHFD) or Western diet (WD). Our results show that control mice in a LFD maintained a normal liver and E2F8 had a tumor-suppressive role for all diets including LF. However, a HFD induced NAFLD while a CDHFD and WD caused NASH by inflammation and fibrosis, respectively. We demonstrate that E2f8 ablation influences collagen deposition, lipid accumulation, and E-cadherin expression. Additionally, experimental mice fed a HFD had an incidence of less than 40% of spontaneous HCC, while experimental mice fed a WD had an incidence of more than 50% of spontaneous HCC; demonstrating that E2F8 tumor-suppressive role is essential to prevent progression to HCC in a NASH model. We hypothesize, that E2F8 has a role in the regulation of liver metabolism. Collectively, our study demonstrates that a WD and E2F8 hepatocyte deletion leads to an increase in lipid and collagen accumulation and HCC occurrence.
Citation Format: Shaaron L. Ochoa-Rios, Lindsey N. Kent, Gustavo Leone. E2F8 tumor suppressive role in Non-Alcoholic Steatohepatitis [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 84.
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