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Reregulation of hepatic stellate cell contraction and cirrhotic portal hypertension by Wnt/β-catenin signaling via interaction with Gli1.

Authors
  • Zhang, Feng1
  • Wang, Feixia1
  • He, Jianlin2
  • Lian, Naqi3
  • Wang, Zhenyi1
  • Shao, Jiangjuan1
  • Ding, Hai4
  • Tan, Shanzhong4
  • Chen, Anping5
  • Zhang, Zili1
  • Wang, Shijun6
  • Zheng, Shizhong1
  • 1 Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, China. , (China)
  • 2 The Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China. , (China)
  • 3 School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China. , (China)
  • 4 The Nanjing Hospital Affiliated to Nanjing University of Chinese Medicine, Nanjing, 210003, China. , (China)
  • 5 Department of Pathology, School of Medicine, Saint Louis University, MO, 63104, USA.
  • 6 Shandong Co-innovation Center of TCM Formula, College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China. , (China)
Type
Published Article
Journal
British Journal of Pharmacology
Publisher
Wiley (Blackwell Publishing)
Publication Date
Oct 21, 2020
Identifiers
DOI: 10.1111/bph.15289
PMID: 33085791
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Portal hypertension is a lethal complication of cirrhosis. Its mechanism and therapeutic targets remain largely unknown. Hepatic stellate cell (HSC) contraction increases intrahepatic vascular resistance contributing to portal hypertension. We investigated how HSC contraction was regulated by Wnt signaling and the therapeutic implication. Liver tissues from cirrhotic patients were examined. Cirrhotic mice with genetic or pharmacological treatments were used for in vivo assessments and their primary cells were isolated. Cellular functions and signaling pathways were analyzed in human HSC-LX2 cells using real-time PCR, Western blotting, siRNA, luciferase reporter assay, chromatin immunoprecipitation, co-immunoprecipitation, and site-directed mutagenesis. Wnt/β-catenin correlated with HSC contraction in human cirrhotic liver. Wnt3a stimulated Smo-independent Gli1 nuclear translocation followed by LARG-mediated RhoA activation leading to HSC contraction. Sufu negatively mediated Wnt3a-induced Gli1 nuclear translocation. Wnt/β-catenin repressed the transcription of Sufu dependent on β-catenin/TCF4 interaction and TCF4 binding to Sufu promoter. Molecular simulation and site-directed mutagenesis identified the β-catenin residues Lys312 and Lys435 critically involved in the interaction. Additionally, TCF4 binding to the sequence CACACCTTCC at Sufu promoter was required for transrepression of Sufu. In cirrhotic mice, short-term liver-targeting β-catenin deficiency or acute treatment with β-catenin inhibitors reduced portal pressure via restriction of HSC contraction rather than inhibition of HSC activation. Long-term deficiency or treatments also ameliorated liver injury, fibrosis and inflammation. Interaction between Wnt/β-catenin and Smo-independent Gli1 pathways promoted HSC contraction via TCF4-dependent transrepression of Sufu. HSC-specific inhibition of β-catenin may have therapeutic benefits for cirrhotic portal hypertension. This article is protected by copyright. All rights reserved.

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