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Inactivating mutations of KILLER/DR5 gene in gastric cancers

W S Park1, J H Lee, M S Shin

  • 1Department of Pathology, College of Medicine, The Catholic University of Korea.

Gastroenterology
|October 26, 2001
PubMed
Abstract

Insights

Genetic alterations in the KILLER/death receptor 5 (DR5) gene may contribute to gastric cancer development. Mutations in KILLER/DR5, which induces apoptosis, were found in gastric tumors, suggesting a role in cancer progression.

Area of Science:

  • Molecular biology
  • Cancer genetics
  • Cell death pathways

Background:

  • The KILLER/death receptor 5 (DR5) is a key mediator of apoptosis and is frequently lost in gastric cancer.
  • p53-mediated apoptosis is crucial for cancer prevention and relies on KILLER/DR5 expression in wild-type p53 cells.
  • Genetic alterations in KILLER/DR5 might play a role in gastric tumorigenesis.

Purpose of the Study:

  • To investigate the involvement of genetic alterations in KILLER/DR5 in the development of gastric cancer.
  • To analyze mutations in KILLER/DR5 and p53 in gastric cancer samples.
  • To assess the functional impact of identified KILLER/DR5 mutations on apoptosis.

Main Methods:

  • Analysis of genetic alterations in KILLER/DR5 and p53 genes in 43 gastric cancer cases.
  • Detection of loss of function in identified KILLER/DR5 mutants.
  • Transfection studies to evaluate the effect of KILLER/DR5 mutants on apoptotic cell death.

Main Results:

  • Three missense mutations (7%) in KILLER/DR5 were identified, with two showing allelic loss.
  • All identified KILLER/DR5 mutants inhibited apoptotic cell death in functional assays.
  • Six p53 mutations (14%) were found, and notably, tumors with KILLER/DR5 mutations did not harbor p53 mutations.

Conclusions:

  • Inactivation of KILLER/DR5 through mutations represents a potential mechanism for evading KILLER/DR5-mediated apoptosis.
  • Inactivating mutations in KILLER/DR5 may contribute to the development or progression of a subset of gastric cancers.
  • The findings highlight a potential role for KILLER/DR5 in gastric cancer pathogenesis, independent of p53 mutations.

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