Cited by 515Liver physiology and pathologyLiver Disease Diagnosis and TreatmentDrug-Induced Hepatotoxicity and Protection

Deactivation of Hepatic Stellate Cells During Liver Fibrosis Resolution in Mice

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Troeger, Juliane S., Mederacke, Ingmar, Gwak, Geum–Youn, Dapito, Dianne H., Mu, Xueru, Hsu, Christine C., Pradere, Jean–Philippe, Friedman, Richard A. +1 more·2012·Gastroenterology

Abstract

Background & aims Activated hepatic stellate cells (HSCs), the main fibrogenic cell type in the liver, undergo apoptosis after cessation of liver injury, which contributes to resolution of fibrosis. In this study, we investigated whether HSC deactivation constitutes an additional mechanism of liver fibrosis resolution.Methods HSC activation and deactivation were investigated by single-cell PCR and genetic tracking in transgenic mice that expressed a tamoxifen-inducible CreER under control of the endogenous vimentin promoter (Vimentin-CreER).Results Single-cell quantitative polymerase chain reaction demonstrated activation of almost the entire HSC population in fibrotic livers, and a gradual decrease of HSC activation during fibrosis resolution, indicating deactivation of HSCs. Vimentin-CreER marked activated HSCs, demonstrated by a 6- to 16-fold induction of a membrane-bound green fluorescent protein (mGFP) Cre-reporter after injection of carbon tetrachloride, in liver and isolated HSCs, and a shift in localization of mGFP-marked HSCs from peri-sinusoidal to fibrotic septa. Tracking of mGFP-positive HSCs revealed the persistence of 40%-45% of mGFP expression in livers and isolated HSCs 30-45 days after carbon tetrachloride was no longer administered, despite normalization of fibrogenesis parameters; these findings confirm reversal of HSC activation. After fibrosis resolution, mGFP expression was observed again in desmin-positive peri-sinusoidal HSCs; no mGFP expression was detected in hepatocytes or cholangiocytes, excluding mesenchymal-epithelial transition. Notably, reverted HSCs remained in a primed state, with higher levels of responsiveness to fibrogenic stimuli.Conclusions In mice, reversal of HSC activation contributes to termination of fibrogenesis during fibrosis resolution, but results in higher responsiveness of reverted HSCs to recurring fibrogenic stimulation.

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Crossref · 10.1053/j.gastro.2012.06.036

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  • Restored RSPO3 expression during HSC deactivation or by therapeutic interventions might help to regain hepatocyte functions.

    “Conversely, restored RSPO3 expression during HSC deactivation52,53 or by therapeutic interventions might help to regain hepatocyte functions.”
  • Most myofibroblasts in chemically injured mouse models come from HSCs, and depleting them reduces liver fibrosis.

    “The majority of myofibroblasts in chemically-injured mouse models also derive from HSCs, and their depletion reduces liver fibrosis (52-54).”
  • Other myofibroblast sources include vascular smooth muscle cells, mesothelial cells, and portal fibroblasts; portal myofibroblasts marked by THY1 may play an outsized role in biliary fibrosis because of their portal location.

    “Other sources of myofibroblasts include vascular smooth muscle cells, mesothelial cells, and portal fibroblasts, out of which portal myofibroblasts marked by thymocyte differentiation antigen 1 (THY1) may play an outsized role in biliary fibrosis due to their physical localization in the portal region (53, 55-57) (58).”
  • Animal models reinforce the capacity of injured liver to regress fibrosis and provide a platform for dissecting mechanisms, although mouse fibrosis regresses rapidly, possibly due to short model duration and young age.

    “Animal models reinforce the capacity of the injured liver to regress fibrosis and provide important platform for dissecting underlying mechanisms, although it should be noted that fibrosis in mice regresses incredibly rapidly, which may be in part attributed to the short duration of models (weeks to months in mice vs. years to decades in humans) and initiation of fibrosis at relatively young age (”
  • Animal models implicate HSCs and immune cells, especially macrophages, as major cellular drivers of extracellular matrix turnover, through reduced secretion of ECM components and crosslinking enzymes and increased secretion of proteases and their inhibitors.

    “Animal models implicate HSCs and immune cells, especially macrophages, as major cellular drivers of extracellular matrix turnover, both through reduced secretion of ECM components and crosslinking enzymes as well as increased secretion of proteases and their inhibitors (51, 52, 64, 262, 270-274).”

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Authors
Troeger, J. S., Mederacke, I., Gwak, G., Dapito, D. H., Mu, X., Hsu, C. C., Pradere, J., Friedman, R. A., & Schwabe, R. F.
Affiliations
  • Columbia University (US)
  • Herbert Irving Comprehensive Cancer Center (US)
Corresponding author
Schwabe, Robert F.
Venue
Gastroenterology
Publisher
Elsevier BV
Published
2012-10
Volume
143
Issue
4
Pages
1073-1083.e22
ISSN
0016-5085 (ISSN-L)
OpenAlex
W2163036793
Cited by
515
References
40
Citations by year
2026: 21 · 2025: 40 · 2024: 36 · 2023: 31 · 2022: 31 · 2021: 37 · 2020: 48 · 2019: 34 · 2018: 40 · 2017: 38 · 2016: 44 · 2015: 45 · 2014: 40 · 2013: 24 · 2012: 3
FWCI
22.69
Type
journal article
Language
en
Open access
Locations
  • Gastroenterology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (1F31DK091980, ME 3723/1-1)
  • American Liver Foundation
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
Keywords
hepatic stellate cells, liver fibrosis, fibrosis resolution, stellate cell activation, apoptosis, carbon tetrachloride-induced liver injury, single-cell PCR, desmin
MeSH terms
Collagen Type I, alpha 1 Chain, Actins, Animals, Carbon Tetrachloride, Cells, Cultured, Genetic Techniques, Genotype, Liver Cirrhosis, Male, Mice, Transgenic, Platelet-Derived Growth Factor, RNA, Messenger, Tamoxifen, Vimentin, Biomarkers, Gene Expression, Polymerase Chain Reaction, Transforming Growth Factor beta, Integrases, Collagen Type I, Green Fluorescent Proteins, Mice, Hepatic Stellate Cells, Myofibroblasts

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