首页|Peroxisome proliferator-activated receptors gama ameliorates liver fibrosis in non-alcoholic fatty liver disease by inhibiting TGF-β/Smad signaling activation

Peroxisome proliferator-activated receptors gama ameliorates liver fibrosis in non-alcoholic fatty liver disease by inhibiting TGF-β/Smad signaling activation

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Background:Nonalcoholic fatty liver disease(NAFLD)is a chronic condition characterized by a progressive decline in liver function,leading to disruptions in liver integrity and metabolic function,resulting in lipid deposition and excessive accumulation of extracellular matrix(ECM).The pathogenesis of NAFLD is complex and not yet fully understood,contributing to the absence of specific therapeutic strategies.Peroxisome proliferator-activated receptor gamma(PPARγ)is a ligand-activated transcription factor pivotal in regulating lipid and glucose metabolism.However,the impacts of PPARγ on NAFLD remains insufficiently explored.Thus,this study aimed to investigate the role of PPARγ in NAFLD and its underlying molecular mechanisms.Methods:Chemical detection kits were utilized to quantify collagen content,alanine aminotransferase(ALT),and aspartate aminotransferase(AST)level variations.Quantitative real-time polymerase chain reaction(qRT-PCR)was employed to assess alterations in extracellular matrix-related genes and inflammatory response genes in liver tissue and HepG2 cells,while western blotting was conducted to analyze the levels of both PPARγ and the TGF-β/Smad signaling pathway.Results:Our findings unveiled significantly reduced PPARγ expression in a rat model of NAFLD,leading to subsequent activation of the TGF-β/Smad signaling pathway.Furthermore,PPARγ activation effectively mitigated NAFLD progression by inhibiting inflammation and fibrosis-related gene expression and collagen production.On a cellular level,PPARγ activation was found to inhibit the expression of extracellular matrix-related genes such as matrix metalloproteinase 2(MMP2)and matrix metalloproteinase 9(MMP9),along with inflammatory response genes interleukin(IL)-1β and IL-6.Additionally,PPARγ activation led to a significant decrease in the levels of ALT and AST.At the molecular level,PPARγ notably down-regulated the TGF-β/Smad signaling pathway,which is known to promote liver fibrosis.Conclusion:These groundbreaking findings underscore PPARγ activation as a promising therapeutic approach to delay NAFLD progression by targeting the TGF-β/Smad signaling pathway in hepatic cells.This highlights the potential of PPARγ as a promising therapeutic target for NAFLD management in clinical settings.

NAFLDPPARγTGF-β/Smadliver fibrosis

Qingwei Zhang、Wenjie Zhao、Zeqi Sun、Xinxin Dong、Liwei Zhu、Zhen Zhang、Ximing Chen、Yingying Hu、Menghan Du、Jiamin Li、Yong Zhang

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Department of Pharmacology,College of Pharmacy,and Department of Cardiology,the Second Affiliated Hospital,Harbin Medical University,Harbin 150081,China

Department of Pharmacology,College of Pharmacy,Harbin Medical University,Harbin 150081,China

The State Key Laboratory of Frigid Zone Cardiovascular Diseases(SKLFZCD),and the Key Laboratory of Cardiovascular Medicine Research,Ministry of Education,Harbin 150081,China

Research Unit of Noninfectious Chronic Diseases in Frigid Zone,Chinese Academy of Medical Sciences,2019RU070,Harbin 150081,China

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国家自然科学基金HMU Marshal Initiative Funding

82273919HMUMIF-21022

2024

10.2478/fzm-2024-0002

寒地医学(英文)
黑龙江省卫生健康发展研究中心

寒地医学(英文)

ISSN：2096-9074
年,卷(期)：2024.4(1)
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