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Loss of PTEN expression by dermal fibroblasts causes skin fibrosis

Sunil K Parapuram1, Xu Shi-wen, Christopher Elliott

  • 1Department of Dentistry, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.

The Journal of Investigative Dermatology
|June 10, 2011
PubMed

Insights

Protein phosphatase and tensin homolog (PTEN) deficiency drives fibrosis by increasing collagen deposition. Restoring PTEN may offer a novel anti-fibrotic therapy for organ damage.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Dermatology

Background:

  • Fibrosis, characterized by excessive scarring, is a common pathway to organ failure with no effective treatments.
  • Dysregulated tissue repair mechanisms underlie pathological fibrosis across various diseases.
  • Protein phosphatase and tensin homolog (PTEN) dephosphorylates proteins, influencing tissue repair and potentially mediating fibrosis.

Purpose of the Study:

  • To investigate the role of PTEN in fibrogenesis.
  • To determine if reduced PTEN expression is sufficient to cause fibrosis in vivo.
  • To explore PTEN as a therapeutic target for fibrotic diseases.

Main Methods:

  • Assessed PTEN expression in skin fibroblasts from patients with diffuse systemic sclerosis (dSSc).
  • Generated a mouse model with PTEN deletion in adult fibroblasts to study in vivo effects.
  • Analyzed dermal thickness, collagen deposition, Akt phosphorylation, and connective tissue growth factor (CTGF/CCN2) expression.

Main Results:

  • PTEN expression was reduced in dSSc fibroblasts.
  • PTEN-deficient mice exhibited a 3-fold increase in dermal thickness due to excess collagen.
  • PTEN loss led to elevated Akt phosphorylation and increased CCN2 expression, which were reversed by inhibiting the PI3K/Akt pathway.
  • Overexpressing PTEN in dSSc fibroblasts reduced collagen and CCN2 overexpression.

Conclusions:

  • PTEN acts as a key in vivo regulator of fibrogenesis.
  • PTEN deficiency promotes excessive collagen deposition and tissue scarring.
  • PTEN agonists show potential as novel anti-fibrotic treatments for conditions like dSSc.

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