Evidence map›Paper›PMID 21527725›Full record

ArticleAmerican journal of physiology. Gastrointestinal and liver physiology2011

Hepatic stellate cells require a stiff environment for myofibroblastic differentiation.

Abby L Olsen, Steven A Bloomer, Erick P Chan, Marianna D A Gaça, Penelope C Georges, Bridget Sackey, Masayuki Uemura, Paul A Janmey, Rebecca G Wells

Abstract read
In one paragraph

Article in American journal of physiology. Gastrointestinal and liver physiology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 215 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
215citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

215 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Article
  3. Actin cytoskeletal dynamics in hepatic myofibroblasts and fibrosis.Nature reviews. Gastroenterology & hepatology · 2026
    Review
  4. Article
  5. Review
  6. Article
  7. Review
  8. Liver Macrophages in the Pathogenesis of Viral Hepatitis.Current issues in molecular biology · 2026
    Review
  9. Article
  10. Review
  11. Article
  12. Cholesterol-containing lipid crystals can directly stiffen the rat steatotic liver before fibrosis.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  13. Review
  14. Review
  15. Review
  16. Review
  17. Article
  18. Article
  19. Review
  20. Article

155 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Abby L OlsenDepartment of Medicine, University of Pennsylvania School of Medicine, Philadelphia, USA.
Steven A Bloomer
Erick P Chan
Marianna D A Gaça
Penelope C Georges
Bridget Sackey
Masayuki Uemura
Paul A Janmey
Rebecca G Wells

Funding

TRANSGENIC AND CHIMERIC MOUSE COREP30DK050306 · NIDDK · UNIVERSITY OF PENNSYLVANIA · PI Ken Hashigiwa Cadwell · 1997 to 2026
$32.5M
UNIVERSITY OF PENNSYLVANIA TRAINING IN GASTROENTEROLOGYT32DK007066 · NIDDK · UNIVERSITY OF PENNSYLVANIA · PI JONATHAN P KATZ · 1986 to 2026
$11.7M
TGF-B Mediated Fibrosis in a Hepatic Stellate Cell ModelR01DK058123 · NIDDK · YALE UNIVERSITY · PI WELLS, REBECCA G · 2001 to 2016
$4.5M
Mechanical control of cell growth and differentiationR01GM083272 · NIGMS · UNIVERSITY OF PENNSYLVANIA · PI JANMEY, PAUL A · 2008 to 2011
$2.0M
Cellular fibronectin and hepatic stellate cell function in liver fibrosisF30DK081265 · NIDDK · UNIVERSITY OF PENNSYLVANIA · PI OLSEN, ABBY LAUREN · 2008 to 2011
$125k
NIDDK NIH HHS F30 DK081265NIDDK NIH HHS P30 DK050306NIDDK NIH HHS P30 DK50306NIDDK NIH HHS R01 DK058123NIDDK NIH HHS T32 DK07066NIGMS NIH HHS GM083272
6 · The paper itself

Abstract

The myofibroblastic differentiation of hepatic stellate cells (HSC) is a critical event in liver fibrosis and is part of the final common pathway to cirrhosis in chronic liver disease from all causes. The molecular mechanisms driving HSC differentiation are not fully understood. Because macroscopic tissue stiffening is a feature of fibrotic disease, we hypothesized that mechanical properties of the underlying matrix are a principal determinant of HSC activation. Primary rat HSC were cultured on inert polyacrylamide supports of variable but precisely defined shear modulus (stiffness) coated with different extracellular matrix proteins or poly-L-lysine. HSC differentiation was determined by cell morphology, immunofluorescence staining, and gene expression. HSC became progressively myofibroblastic as substrate stiffness increased on all coating matrices, including Matrigel. The degree rather than speed of HSC activation correlated with substrate stiffness, with cells cultured on supports of intermediate stiffness adopting stable intermediate phenotypes. Quiescent cells on soft supports were able to undergo myofibroblastic differentiation with exposure to stiff supports. Stiffness-dependent differentiation required adhesion to matrix proteins and the generation of mechanical tension. Transforming growth factor-β treatment enhanced differentiation on stiff supports, but was not required. HSC differentiate to myofibroblasts in vitro primarily as a function of the physical rather than the chemical properties of the substrate. HSC require a mechanically stiff substrate, with adhesion to matrix proteins and the generation of mechanical tension, to differentiate. These findings suggest that alterations in liver stiffness are a key factor driving the progression of fibrosis.

Indexed as

AnimalsCell DifferentiationCells, CulturedCollagenDrug CombinationsExtracellular MatrixHepatic Stellate CellsLamininLiver CirrhosisMaleMyofibroblastsPolylysineProteoglycansRatsRats, Sprague-DawleyTransforming Growth Factor betaCollagenDrug CombinationsLamininmatrigelPolylysineProteoglycansTransforming Growth Factor beta

Identifiers

PMID21527725
PMCPMC3129929

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.