Cited by 201Liver physiology and pathologyLiver Disease Diagnosis and TreatmentHedgehog Signaling Pathway Studies

Increased production of sonic hedgehog by ballooned hepatocytes

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Rangwala, Fatima, Guy, Cynthia D, Lu, Jiuyi, Suzuki, Ayako, Burchette, James L, Abdelmalek, Manal F, Chen, Wei, Diehl, Anna Mae·2011·The Journal of Pathology

Abstract

Ballooned hepatocytes distinguish non‐alcoholic steatohepatitis (NASH) from steatosis. Such cells contain dilated endoplasmic reticulum and ubiquitin aggregates, characteristics of endoplasmic reticulum stress. Hepatocyte ballooning increases the risk for fibrosis in NASH, suggesting that ballooned hepatocytes release pro‐fibrogenic factors. Hedgehog ligands function as pro‐fibrogenic factors in liver diseases, but mechanisms for hedgehog ligand production remain poorly understood. We evaluated the hypothesis that endoplasmic reticulum stress induces hepatocyte production of hedgehog ligands that provide paracrine pro‐fibrogenic signals to neighbouring cells. In livers from NASH patients, keratin 8/18 and ubiquitin staining demonstrated enlarged, keratin 8/18‐negative/ubiquitin‐positive hepatocytes (ballooned hepatocytes) that were positive for Sonic hedgehog. In order to model endoplasmic reticulum stress in vitro , primary mouse hepatocytes were treated with tunicamycin. Compared to vehicle, tunicamycin significantly increased Sonic hedgehog and Indian hedgehog expression. Furthermore, conditioned medium from tunicamycin‐treated hepatocytes increased Gli‐luciferase reporter activity 14‐fold more than conditioned medium from vehicle‐treated hepatocytes. Cyclopamine (hedgehog signalling inhibitor) abrogated the effect of conditioned medium from tunicamycin‐treated hepatocytes, verifying that soluble hepatocyte‐derived factors activate hedgehog signalling. Ballooned hepatocytes in NASH patients did not express the hedgehog target gene, Gli2 , α‐smooth muscle actin or vimentin, but were surrounded by Gli2 ‐positive stromal cells expressing these myofibroblast markers. Trichrome staining demonstrated the accumulation of ballooned hepatocytes in areas of matrix deposition, and numbers of Sonic hedgehog‐positive hepatocytes correlated with the degree of ballooning and fibrosis stage. Hepatocytes undergoing endoplasmic reticiulum stress generate hedgehog ligands which act as paracrine pro‐fibrogenic factors for hedgehog‐responsive stromal cells. These results help to explain why fibrosis stage correlates with hepatocyte ballooning in NASH. Copyright © 2011 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.

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  • Hedgehog pathway activation is triggered by injured, ballooned and/or TAZ-expressing hepatocytes in NASH via the release of sonic hedgehog or Indian hedgehog.

    “Hedgehog pathway activation is triggered by injured, ballooned and/or TAZ-expressing hepatocytes in NASH via the release of sonic hedgehog or Indian hedgehog.30,38”
  • Hedgehog pathways including Indian hedgehog and sonic hedgehog are expressed in ballooned NASH hepatocytes and closely correlate with lymphocytic infiltration, ductular reaction and ECM collagen deposition.

    “hedgehog pathways including Indian hedgehog and sonic hedgehog, which are expressed in ballooned NASH hepatocytes and closely correlate with lymphocytic infiltration, ductular reaction and ECM collagen deposition.38”
  • These signals include sonic hedgehog, which activates hedgehog signaling in surrounding stromal cells.

    “These signals include sonic hedgehog, which activates hedgehog signaling in the surrounding stromal cells (157).”

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Authors
Rangwala, F., Guy, C. D., Lu, J., Suzuki, A., Burchette, J. L., Abdelmalek, M. F., Chen, W., & Diehl, A. M.
Affiliations
  • Duke University (US)
  • Duke Medical Center (US)
Corresponding author
Diehl, Anna Mae
Venue
The Journal of Pathology
Publisher
Wiley
Published
2011-05-05
Volume
224
Issue
3
Pages
401-410
ISSN
  • 0022-3417 (ISSN-L)
  • 1096-9896
OpenAlex
W2021688906
Cited by
201
References
35
Citations by year
2026: 9 · 2025: 14 · 2024: 16 · 2023: 18 · 2022: 16 · 2021: 13 · 2020: 13 · 2019: 15 · 2018: 17 · 2017: 12 · 2016: 13 · 2015: 11 · 2014: 11 · 2013: 8 · 2012: 10
FWCI
6.49
Type
journal article
Language
en
Open access
Locations
  • The Journal of Pathology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • The National Institute of Health (RO1 DK077794, RO1 AA010154)
  • Duke Oncology Training (T32 302-0202)
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Hedgehog Signaling Pathway Studies
Keywords
Sonic hedgehog, nonalcoholic steatohepatitis, endoplasmic reticulum stress, liver fibrosis, Hedgehog signaling, paracrine signaling, stromal cells, myofibroblasts, tunicamycin, cyclopamine, GLI2, hepatocyte ballooning
MeSH terms
Zinc Finger Protein Gli2, Adult, Animals, Biopsy, Cells, Cultured, Endoplasmic Reticulum, Fatty Liver, Humans, Keratins, Ligands, Liver, Mice, Inbred C57BL, Middle Aged, Nuclear Proteins, Stress, Physiological, Tunicamycin, Stromal Cells, alpha 1-Antitrypsin Deficiency, Hepatocytes, Proto-Oncogene Proteins c-akt, Mice, Kruppel-Like Transcription Factors, Hedgehog Proteins, Myofibroblasts

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