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miR-133b Regulation of Connective Tissue Growth Factor: A Novel Mechanism in Liver Pathology
Altin Gjymishka1, Liya Pi1, Seh-Hoon Oh1
1Department of Pediatrics, University of Florida, Gainesville, Florida.
Abstract:
miRNAs are involved in liver regeneration, and their expression is dysregulated in hepatocellular carcinoma (HCC). Connective tissue growth factor (CTGF), a direct target of miR-133b, is crucial in the ductular reaction (DR)/oval cell (OC) response for generating new hepatocyte lineages during liver injury in the context of hepatotoxin-inhibited hepatocyte proliferation. Herein, we investigate whether miR-133b regulation of CTGF influences HCC cell proliferation and migration, and DR/OC response. We analyzed miR-133b expression and found it to be down-regulated in HCC patient samples and induced in the rat DR/OC activation model of 2-acetylaminofluorene with partial hepatectomy. Furthermore, overexpression of miR-133b via adenoviral system in vitro led to decreased CTGF expression and reduced proliferation and Transwell migration of both HepG2 HCC cells and WBF-344 rat OCs. In vivo, overexpression of miR-133b in DR/OC activation models of 2-acetylaminofluorene with partial hepatectomy in rats, and 3,5-diethoxycarbonyl-1,4-dihydrocollidine in mice, led to down-regulation of CTGF expression and OC proliferation. Collectively, these results show that miR-133b regulation of CTGF is a novel mechanism critical for the proliferation and migration of HCC cells and OC response.
Insights
MicroRNA-133b (miR-133b) suppresses hepatocellular carcinoma (HCC) cell growth and migration by downregulating connective tissue growth factor (CTGF). This finding is crucial for understanding liver regeneration and HCC progression.
Area of Science:
- Hepatology
- Molecular Biology
- Oncology
Background:
- MicroRNAs (miRNAs) play roles in liver regeneration and are dysregulated in hepatocellular carcinoma (HCC).
- Connective tissue growth factor (CTGF) is a direct target of miR-133b and is vital for the ductular reaction (DR)/oval cell (OC) response during liver injury.
- Hepatocyte proliferation can be inhibited by hepatotoxins, necessitating alternative mechanisms for liver repair.
Purpose of the Study:
- To investigate the influence of miR-133b's regulation of CTGF on HCC cell proliferation and migration.
- To determine the role of miR-133b and CTGF in the ductular reaction/oval cell response.
Main Methods:
- Analysis of miR-133b expression in HCC patient samples and a rat liver injury model.
- In vitro studies using adenoviral systems to overexpress miR-133b in HepG2 HCC cells and WBF-344 rat OCs.
- In vivo studies involving miR-133b overexpression in rat and mouse models of liver injury and regeneration.
Main Results:
- miR-133b was found to be downregulated in HCC samples and induced during rat DR/OC activation.
- Overexpression of miR-133b in vitro decreased CTGF expression, HCC cell proliferation, and migration, as well as OC proliferation.
- In vivo overexpression of miR-133b led to CTGF downregulation and reduced OC proliferation in liver injury models.
Conclusions:
- miR-133b acts as a tumor suppressor in HCC by inhibiting proliferation and migration.
- The miR-133b-CTGF axis is a critical regulator of both HCC progression and the ductular reaction/oval cell response in liver regeneration.
- Targeting miR-133b may offer a therapeutic strategy for hepatocellular carcinoma and liver injury.
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