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Down-regulation of Id-1 expression is associated with TGF beta 1-induced growth arrest in prostate epithelial cells

M T Ling1, X Wang, S W Tsao

  • 1Department of Anatomy, Faculty of Medicine, 5/F, Li Shu Fan Building, 5 Sassoon Road, University of Hong Kong, Hong Kong, SAR, China.

Biochimica Et Biophysica Acta
|May 22, 2002
PubMed

Insights

Transforming growth factor beta1 (TGF beta 1) suppresses Id-1 expression, a key inhibitor of prostate cell differentiation and growth. This finding reveals a novel regulatory role for TGF beta 1 in prostate epithelial cell biology.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Transforming growth factor beta1 (TGF beta 1) regulates prostate epithelial cell growth and differentiation.
  • Mechanisms underlying TGF beta 1 action in prostate cells are not fully understood.

Purpose of the Study:

  • Investigate the role of Id-1 in TGF beta 1 signaling pathway in prostate epithelial cells.
  • Determine if TGF beta 1 influences Id-1 expression and its downstream effectors.

Main Methods:

  • Utilized a human papilloma virus 16 E6/E7 immortalized prostate epithelial cell line (HPr-1).
  • Assessed Id-1 mRNA and protein expression levels following TGF beta 1 treatment.
  • Examined the expression of downstream effectors, p21(WAF1) and p27(KIP1).

Main Results:

  • TGF beta 1 suppressed both Id-1 mRNA and protein expression in HPr-1 cells.
  • TGF beta 1-induced growth arrest and differentiation correlated with decreased Id-1 levels.
  • Up-regulation of p21(WAF1) and increased expression of p27(KIP1) were observed after TGF beta 1 exposure.

Conclusions:

  • TGF beta 1 may act as an upstream regulator of Id-1 in prostate epithelial cells.
  • Id-1 is likely involved in TGF beta 1-mediated growth arrest and differentiation.
  • Other factors beyond Id-1 down-regulation contribute to TGF beta 1's effects on prostate cells.

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