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Negative regulation of myofibroblast differentiation by PTEN (Phosphatase and Tensin Homolog Deleted on chromosome 10).

Publication ,  Journal Article
White, ES; Atrasz, RG; Hu, B; Phan, SH; Stambolic, V; Mak, TW; Hogaboam, CM; Flaherty, KR; Martinez, FJ; Kontos, CD; Toews, GB
Published in: Am J Respir Crit Care Med
January 1, 2006

RATIONALE: Myofibroblasts are primary effector cells in idiopathic pulmonary fibrosis (IPF). Defining mechanisms of myofibroblast differentiation may be critical to the development of novel therapeutic agents. OBJECTIVE: To show that myofibroblast differentiation is regulated by phosphatase and tensin homolog deleted on chromosome 10 (PTEN) activity in vivo, and to identify a potential mechanism by which this occurs. METHODS: We used tissue sections of surgical lung biopsies from patients with IPF to localize expression of PTEN and alpha-smooth muscle actin (alpha-SMA). We used cell culture of pten(-/-) and wild-type fibroblasts, as well as adenoviral strategies and pharmacologic inhibitors, to determine the mechanism by which PTEN inhibits alpha-SMA, fibroblast proliferation, and collagen production. RESULTS: In human lung specimens of IPF, myofibroblasts within fibroblastic foci demonstrated diminished PTEN expression. Furthermore, inhibition of PTEN in mice worsened bleomycin-induced fibrosis. In pten(-/-) fibroblasts, and in normal fibroblasts in which PTEN was inhibited, alpha-SMA, proliferation, and collagen production was upregulated. Addition of transforming growth factor-beta to wild-type cells, but not pten(-/-) cells, resulted in increased alpha-SMA expression in a time-dependent fashion. In pten(-/-) cells, reconstitution of PTEN decreased alpha-SMA expression, proliferation, and collagen production, whereas overexpression of PTEN in wild-type cells inhibited transforming growth factor-beta-induced myofibroblast differentiation. It was observed that both the protein and lipid phosphatase actions of PTEN were capable of modulating the myofibroblast phenotype. CONCLUSIONS: The results indicate that in IPF, myofibroblasts have diminished PTEN expression. Inhibition of PTEN in vivo promotes fibrosis, and PTEN inhibits myofibroblast differentiation in vitro.

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Published In

Am J Respir Crit Care Med

DOI

ISSN

1073-449X

Publication Date

January 1, 2006

Volume

173

Issue

1

Start / End Page

112 / 121

Location

United States

Related Subject Headings

  • Transforming Growth Factor beta
  • Respiratory System
  • Pulmonary Fibrosis
  • PTEN Phosphohydrolase
  • Mice, Inbred C57BL
  • Mice
  • Lung Diseases, Interstitial
  • Humans
  • Fibrosis
  • Fibroblasts
 

Citation

APA
Chicago
ICMJE
MLA
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White, E. S., Atrasz, R. G., Hu, B., Phan, S. H., Stambolic, V., Mak, T. W., … Toews, G. B. (2006). Negative regulation of myofibroblast differentiation by PTEN (Phosphatase and Tensin Homolog Deleted on chromosome 10). Am J Respir Crit Care Med, 173(1), 112–121. https://doi.org/10.1164/rccm.200507-1058OC
White, Eric S., Rachelle G. Atrasz, Biao Hu, Sem H. Phan, Vuk Stambolic, Tak W. Mak, Cory M. Hogaboam, et al. “Negative regulation of myofibroblast differentiation by PTEN (Phosphatase and Tensin Homolog Deleted on chromosome 10).Am J Respir Crit Care Med 173, no. 1 (January 1, 2006): 112–21. https://doi.org/10.1164/rccm.200507-1058OC.
White ES, Atrasz RG, Hu B, Phan SH, Stambolic V, Mak TW, et al. Negative regulation of myofibroblast differentiation by PTEN (Phosphatase and Tensin Homolog Deleted on chromosome 10). Am J Respir Crit Care Med. 2006 Jan 1;173(1):112–21.
White, Eric S., et al. “Negative regulation of myofibroblast differentiation by PTEN (Phosphatase and Tensin Homolog Deleted on chromosome 10).Am J Respir Crit Care Med, vol. 173, no. 1, Jan. 2006, pp. 112–21. Pubmed, doi:10.1164/rccm.200507-1058OC.
White ES, Atrasz RG, Hu B, Phan SH, Stambolic V, Mak TW, Hogaboam CM, Flaherty KR, Martinez FJ, Kontos CD, Toews GB. Negative regulation of myofibroblast differentiation by PTEN (Phosphatase and Tensin Homolog Deleted on chromosome 10). Am J Respir Crit Care Med. 2006 Jan 1;173(1):112–121.

Published In

Am J Respir Crit Care Med

DOI

ISSN

1073-449X

Publication Date

January 1, 2006

Volume

173

Issue

1

Start / End Page

112 / 121

Location

United States

Related Subject Headings

  • Transforming Growth Factor beta
  • Respiratory System
  • Pulmonary Fibrosis
  • PTEN Phosphohydrolase
  • Mice, Inbred C57BL
  • Mice
  • Lung Diseases, Interstitial
  • Humans
  • Fibrosis
  • Fibroblasts