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Fas-associated phosphatase-1 promotes Fas-mediated apoptosis in human colon cancer cells: novel function of FAP-1

Takako Miyazaki1, Yoshinari Atarashi, Satoshi Yasumura

  • 1Third Department of Internal Medicine, Division of Transfusion Medicine and Cell Therapy, Toyama Medical and Pharmaceutical University, Toyama, Japan.

Journal of Gastroenterology and Hepatology
|May 19, 2006
PubMed
Abstract

Insights

Fas-associated phosphatase-1 (FAP-1) overexpression increases colon cancer cell sensitivity to Fas-mediated apoptosis. Upregulation of p21 may contribute to this enhanced cell death.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Death Signaling

Background:

  • Fas-associated phosphatase-1 (FAP-1) traditionally viewed as an inhibitor of Fas-mediated apoptosis.
  • Investigating FAP-1's role in human colon cancer cell apoptosis is crucial for understanding cancer progression.

Purpose of the Study:

  • To elucidate the role of FAP-1 in Fas-mediated apoptosis of human colon cancer cells.
  • To determine if FAP-1 influences the sensitivity of colon cancer cells to Fas-induced cell death.

Main Methods:

  • Utilized WST-1 assay and cell death detection ELISA to assess cell viability.
  • Transfected SW480 colon cancer cells with FAP-1 and analyzed gene expression via cDNA microarrays.
  • Examined protein expression of FAP-1 and apoptosis-related molecules using western blot.

Main Results:

  • FAP-1 overexpressing clones showed significantly increased susceptibility to Fas-mediated apoptosis.
  • Caspase 8 and caspase 3 activation was observed in FAP-1 overexpressing cells upon anti-Fas antibody treatment.
  • Upregulation of p21 and phosphorylated p21 was confirmed, suggesting a role in apoptosis modulation.

Conclusions:

  • Overexpression of FAP-1 enhances susceptibility to Fas-mediated apoptosis in SW480 colon cancer cells.
  • Upregulation of p21 is implicated as a contributing factor to FAP-1's effect on apoptosis.
  • Identified a novel function for FAP-1 in regulating Fas-mediated apoptosis in colon cancer.

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