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Inhibitors of apoptosis proteins in prostate cancer cell lines

Kevin R McEleny1, R William G Watson, Ronan N T Coffey

  • 1Department of Surgery, Mater Misericordiae Hospital, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, 47 Eccles Street, Dublin 7, Ireland.

The Prostate
|April 12, 2002
PubMed
Abstract

Insights

Inhibitors of apoptosis proteins (IAPs) are expressed in prostate cancer cells and may contribute to tumor resistance to apoptosis. This study investigated IAP expression in common prostate cancer cell lines.

Area of Science:

  • Oncology
  • Molecular Biology

Background:

  • Caspases are key executioners of apoptosis.
  • Inhibitors of Apoptosis Proteins (IAPs) are caspase inhibitors.
  • Tumor resistance to apoptosis may involve IAP expression.

Purpose of the Study:

  • Investigate IAP expression in prostate cancer cell lines.
  • Determine the role of IAPs in apoptotic resistance.

Main Methods:

  • Assessed expression of NAIP, cIAP-1, cIAP-2, XIAP, and survivin in LNCaP, PC3, and DU145 cells.
  • Utilized RNase protection assays and Western blotting for RNA and protein analysis.
  • Determined apoptotic susceptibility using etoposide and propidium iodide staining via flow cytometry.

Main Results:

  • DU145 and PC3 cells exhibited greater apoptosis resistance than LNCaP cells.
  • All investigated IAPs were detected, with varied expression levels across cell types.
  • Immunohistochemistry revealed distinct localization patterns for cIAP-1, cIAP-2, and XIAP.

Conclusions:

  • Characterized IAP expression in commonly used prostate cancer cell lines.
  • IAP expression may significantly contribute to apoptotic resistance in prostate cancer.

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