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Replicative senescence in human uroepithelial cells.

J A Puthenveettil1, M S Burger, C A Reznikoff

  • 1University of Wisconsin Comprehensive Cancer Center, Madison 53792, USA.

Advances in Experimental Medicine and Biology
|December 22, 1999
PubMed
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Elevated p16INK4a, not p53 or p21WAF1, drives replicative senescence in human urothelial cells (HUCs). This clarifies the tumor suppressor role of p16INK4a in bladder cancer.

Area of Science:

  • Cell Biology
  • Oncology
  • Urology

Background:

  • Normal human urothelial cells (HUCs) exhibit replicative senescence.
  • Previous work indicated elevated p16INK4a in senescent HUCs, suggesting its role in this process.

Purpose of the Study:

  • To further characterize the senescent state in HUCs.
  • To investigate the roles of cell cycle proteins p53, p21WAF1, pRb, and cyclin D1 in HUC senescence.

Main Methods:

  • HUCs were cultured from ureteral mucosa explants.
  • Senescence was identified by senescence-associated beta-galactosidase activity (SA-beta-gal).
  • Cell cycle distribution, c-fos induction, and protein levels (p53, p21WAF1, p16INK4a, cyclin D1, PAI-1) were analyzed.

Main Results:

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  • Senescent HUCs were arrested at G1/S and lacked c-fos induction.
  • Elevated p16INK4a was confirmed in senescent HUCs.
  • Unlike fibroblasts, senescent HUCs did not show elevated p53 or p21WAF1, nor elevated PAI-1.

Conclusions:

  • p16INK4a elevation, not p53 or p21WAF1, is critical for HUC replicative senescence.
  • These findings support p16INK4a's tumor suppressor function and its relevance in bladder tumors with p16INK4a or pRb loss.