Cited by 145Liver physiology and pathologyLiver Disease Diagnosis and TreatmentLiver Diseases and Immunity

Heterogeneity of HSCs in a Mouse Model of NASH

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Rosenthal, Sara Brin, Liu, Xiao, Ganguly, Souradipta, Dhar, Debanjan, Pasillas, Martina P., Ricciardelli, Eugenia, Li, Rick Z., Troutman, Ty D. +3 more·2021·Hepatology

Abstract

Background and Aims: In clinical and experimental NASH, the origin of the scar‐forming myofibroblast is the HSC. We used foz/foz mice on a Western diet to characterize in detail the phenotypic changes of HSCs in a NASH model. Approach and Results: We examined the single‐cell expression profiles (scRNA sequencing) of HSCs purified from the normal livers of foz/foz mice on a chow diet, in NASH with fibrosis of foz/foz mice on a Western diet, and in livers during regression of NASH after switching back to a chow diet. Selected genes were analyzed using immunohistochemistry, quantitative real‐time PCR, and short hairpin RNA knockdown in primary mouse HSCs. Our analysis of the normal liver identified two distinct clusters of quiescent HSCs that correspond to their acinar position of either pericentral vein or periportal vein. The NASH livers had four distinct HSC clusters, including one representing the classic fibrogenic myofibroblast. The three other HSC clusters consisted of a proliferating cluster, an intermediate activated cluster, and an immune and inflammatory cluster. The livers with NASH regression had one cluster of inactivated HSCs, which was similar to, but distinct from, the quiescent HSCs. Conclusions: Analysis of single‐cell RNA sequencing in combination with an interrogation of previous studies revealed an unanticipated heterogeneity of HSC phenotypes under normal and injured states.

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Crossref · 10.1002/hep.31743

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  • MASH regression is characterized by downregulation of profibrotic and inflammatory genes, HSC inactivation, and resolution of steatosis and fibrosis.

    “MASH regression is characterized by downregulation of profibrotic and inflammatory genes, HSC inactivation (31), and resolution of steatosis and fibrosis (22).”

    From Lipid-associated macrophages' promotion of fibrosis resolution during MASH regression requires TREM2 (2024) · cites this paper as [31]

    The Results section reports that fibrogenic gene expression decreased toward normal after the diet switch, and the Discussion identifies inactivated HSCs during NASH regression. The paper does not establish a general downregulation of inflammatory genes: its Results describe an inflammatory HSC cluster that persists during regression. The separate citation (22) is attached to resolution of steatosis and fibrosis, so that clause is not assessed against this source. Page numbers were not available in our copy. (LLM, conf=0.86)

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  • Absence of TREM2 impaired effective HSC inactivation, indicated by higher residual αSMA and desmin in Foz::Trem2−/− regressed mice compared to Foz/Foz.

    “Absence of TREM2 also impaired effective HSC inactivation (31) indicated by higher residual levels of αSMA (activated HSC marker) and desmin (total HSC marker) in Foz::Trem2−/− regressed mice compared to their Foz/Foz counterparts (Fig. 2H and SI Appendix, Fig. S2B).”

    From Lipid-associated macrophages' promotion of fibrosis resolution during MASH regression requires TREM2 (2024) · cites this paper as [31]

    The Results and Discussion describe HSC inactivation during NASH regression in foz/foz mice and identify αSMA as an activated-HSC marker and desmin as a general HSC marker (page numbers unavailable). The paper does not report TREM2-deficient mice or compare residual αSMA and desmin levels between Foz::Trem2−/− and Foz/Foz mice, so it cannot support the claimed impairment caused by TREM2 absence. (LLM, conf=0.88)

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  • MASH-associated activated HSCs return to an inactive state during regression that closely resembles quiescent HSCs but is distinct enough to cluster as a separate population.

    “In contrast, MASH-associated activated HSCs return to an inactive state during regression, that closely resembles the quiescent HSCs but is distinct enough to cluster as a separate population (31).”
  • Sustained myofibroblast activation in chronic liver disease drives fibrosis, especially in MASH, where myofibroblasts are detectable by desmin and αSMA immunofluorescence and by single-cell RNA-seq gene expression.

    “These functions normally contribute to tissue repair under homeostatic conditions, but sustained activation in chronic liver diseases drives fibrosis, especially in MASH (41) where they are detectable by expression of desmin and alpha smooth muscle actin (αSMA) using immunofluorescence, and by conservation of gene expression based on single-cell RNA-seq (42-46).”
  • Although activated HSCs are the primary fibrogenic cells in MASH, single-cell methods have identified an expanded list of fibrogenic drivers expressed by activated HSCs that could be antifibrotic drug targets.

    “Although activated HSCs are the primary fibrogenic cells in MASH, these methods have identified an expanded list of fibrogenic drivers expressed by activated HSCs that could represent antifibrotic drug targets (42, 48, 49, 125).”

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Authors
Rosenthal, S. B., Liu, X., Ganguly, S., Dhar, D., Pasillas, M. P., Ricciardelli, E., Li, R. Z., Troutman, T. D., Kisseleva, T., Glass, C. K., & Brenner, D. A.
Affiliations
University of California San Diego (US)
Corresponding author
Brenner, David A.
Venue
Hepatology
Published
2021-08
Volume
74
Issue
2
Pages
667-685
ISSN
  • 0270-9139 (ISSN-L)
  • 1527-3350
OpenAlex
W3128309898
Cited by
145
References
38
Citations by year
2026: 17 · 2025: 34 · 2024: 27 · 2023: 34 · 2022: 21 · 2021: 12
FWCI
13.32
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institutes of Health (KL2TR001444)
  • National Institute on Alcohol Abuse and Alcoholism (U01AA029019, U01AA022614, U01AA018663, R01AA028550, P50AA011999)
  • National Heart, Lung, and Blood Institute (P01HL147835)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK111866, R56DK088837, P30DK120515, P30DK063491, R01DK101737, T32DK007044, R01DK091183, R01DK099205)
  • National Institute of Environmental Health Sciences (P42ES010337)
  • National Center for Advancing Translational Sciences
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Health Sciences › Medicine › Hepatology › Liver Diseases and Immunity
Keywords
hepatic stellate cells, NASH, liver fibrosis, HSC heterogeneity, myofibroblast activation, Western diet, single-cell RNA sequencing, HSC quiescence, hepatic stellate cell activation, liver injury
MeSH terms
RNA-Seq, Animals, Cells, Cultured, Disease Models, Animal, Humans, Liver, Male, Mice, Transgenic, Mutation, Genetic Heterogeneity, Cell Cycle Proteins, Mice, Gene Regulatory Networks, Hepatic Stellate Cells, Myofibroblasts, Single-Cell Analysis, Primary Cell Culture, Non-alcoholic Fatty Liver Disease, Diet, Western

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