Cited by 228Liver physiology and pathologyTelomeres, Telomerase, and SenescenceMesenchymal stem cell research

Replicative Senescence of Activated Human Hepatic Stellate Cells Is Accompanied by A Pronounced Inflammatory But Less Fibrogenic Phenotype

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Schnabl, Bernd, Purbeck, Carrie A., Choi, Youkyung Hwang, Hagedorn, Curt H., Brenner, David·2003·Hepatology

Abstract

Limited proliferative capacity is a characteristic of most normal human cells and results in a growth–arrested state, called replicative senescence . Functional expression of the telomerase catalytic subunit (human telomerase reverse transcriptase; hTERT) in human activated hepatic stellate cells (HSCs) rescues them from death with immortalization and maintains an activated HSC phenotype. The aim of this study was to evaluate alterations in gene and protein expression of in vitro aged human activated HSCs and to define the pathway by which senescent–activated HSCs are eliminated in culture. Altered patterns of gene expression in senescent human HSCs were assessed using DNA microarray analysis and compared with early passage HSCs or hTERT immortalized HSCs. Senescent HSCs showed higher expression of inflammation and stress–associated genes as compared with early passage HSCs. Senescent HSCs expressed reduced levels of extracellular matrix proteins, including collagens, tenascin, and fibronectin. TUNEL staining of senescent HSCs showed approximately 21% positive cells, indicating DNA fragmentation and apoptosis. Apoptosis involved the mitochondrial pathway with decreased levels of Bcl–2 and Bcl–x L protein, release of cytochrome c, and increased caspase–3 activity. In contrast, 4% to 5% of early activated HSCs or telomerase positive HSCs were TUNEL positive. In conclusion, cultured human HSCs undergo a switch from a fibrogenic to an inflammatory phenotype, suggesting that senescent human HSCs might modulate chronic wound healing processes. Maintenance of telomere length represents an important survival factor for activated human HSCs.

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Crossref · 10.1053/jhep.2003.50097

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  • These results provide a causal explanation for earlier findings showing that presence of senescent hepatic stellate cells correlates with increased inflammation but reduced fibrosis.

    “These results provide a causal explanation for earlier findings showing that the presence of senescent hepatic stellate cells correlates with increased inflammation but reduced fibrosis (148).”

    From Aging, Cellular Senescence, and Cancer (2013) · cites this paper as [148]

    The Results and Discussion report that senescent hepatic stellate cells in culture have a more inflammatory, less fibrogenic phenotype. They do not show that the presence of these cells in the liver correlates with increased inflammation and reduced fibrosis; the Discussion describes its comparison of human livers as preliminary gene-expression evidence, not that correlation. (LLM, conf=0.86)

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  • In response to liver injury, hepatic stellate cells proliferate and produce extracellular matrixes for tissue repair before undergoing cellular senescence to prevent fibrosis.

    “In response to liver injury, hepatic stellate cells (HSC) began to proliferate and produce extracellular matrixes for tissue repair before undergoing cellular senescence to prevent fibrosis.38, 39”

    From Cellular senescence and senescence-associated secretory phenotype via the cGAS-STING signaling pathway in cancer (2020) · cites this paper as [38]

    The paper’s introductory passage says that HSCs proliferate and secrete extracellular-matrix proteins following liver injury. The Discussion reports that activated human HSCs later become senescent in culture, and the Results show reduced collagen and fibronectin secretion in those cells. It does not establish that HSCs undergo senescence in injured livers to prevent fibrosis, or that their matrix production is specifically for tissue repair. (LLM, conf=0.88)

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  1. [30]30. Burns TF, El-Deiry WS. The p53 pathway and apoptosis. J Cell Physiol 1999;181:231-239.

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Authors
Schnabl, B., Purbeck, C. A., Choi, Y. H., Hagedorn, C. H., & Brenner, D.
Affiliations
  • University of North Carolina at Chapel Hill (US)
  • Emory University (US)
Corresponding author
Brenner, David
Venue
Hepatology
Published
2003-03
Volume
37
Issue
3
Pages
653-664
ISSN
0270-9139 (ISSN-L)
OpenAlex
W2020573317
Cited by
224
References
53
Citations by year
2026: 6 · 2025: 9 · 2024: 13 · 2023: 11 · 2022: 13 · 2021: 12 · 2020: 14 · 2019: 8 · 2018: 10 · 2017: 10 · 2016: 8 · 2015: 10 · 2014: 6 · 2013: 12 · 2012: 12
FWCI
5.02
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (DK-34987, AA-11605)
  • National Institute on Alcohol Abuse and Alcoholism (AA 11605)
  • National Institute of General Medical Sciences (GM41804, R01GM041804)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 34987, P30DK034987)
  • Center for Gastrointestinal Biology and Disease, School of Medicine, University of North Carolina at Chapel Hill
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
Keywords
replicative senescence, hepatic stellate cells, telomerase reverse transcriptase, hTERT, apoptosis, mitochondrial apoptosis, Bcl-2, Bcl-xL, caspase-3, cytochrome c release, extracellular matrix proteins, inflammation, liver fibrosis, telomere length, gene expression profiling, chronic wound healing
MeSH terms
beta-Galactosidase, Cell Cycle, Cell Division, Cell Survival, Cytoskeletal Proteins, DNA-Binding Proteins, Hepatitis, Humans, Liver, Phenotype, RNA, Messenger, Gene Expression, Cytokines, Cellular Senescence, Reactive Oxygen Species, Intercellular Adhesion Molecule-1, Chemokines, Vascular Cell Adhesion Molecule-1, Telomerase, Caspases, In Situ Nick-End Labeling, Oligonucleotide Array Sequence Analysis, Caspase 3

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