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Transforming growth factor beta 1 induces apoptotic cell death in cultured human gastric carcinoma cells

K Yanagihara1, M Tsumuraya

  • 1Department of Pathology, Hiroshima University, Japan.

Cancer Research
|July 15, 1992
PubMed

Insights

Transforming growth factor beta 1 (TGF-beta 1) inhibits growth and induces irreversible cell death in specific human gastric scirrhous carcinoma cells. This process involves apoptosis, requiring new protein synthesis for its full effect.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Transforming growth factor beta 1 (TGF-beta 1) is a known growth inhibitor for various cell types, including tumor cells.
  • Two human gastric scirrhous carcinoma cell lines, HSC-39 and HSC-43, were previously established and characterized.

Purpose of the Study:

  • To investigate the effect of TGF-beta 1 on the proliferation and viability of HSC-39 and HSC-43 cells.
  • To compare the response of these scirrhous carcinoma cell lines to TGF-beta 1 with five other human gastric adenocarcinoma cell lines.

Main Methods:

  • Treatment of gastric carcinoma cell lines with varying concentrations of TGF-beta 1.
  • Assessment of cell proliferation, viability, DNA fragmentation, and chromatin condensation.
  • Ultrastructural analysis of cell nuclei.
  • Evaluation of cycloheximide's effect on TGF-beta 1-induced cell death and DNA fragmentation.

Main Results:

  • TGF-beta 1 strongly inhibited proliferation and induced irreversible cell death in HSC-39 and HSC-43 cells in a dose-dependent manner (up to 4 ng/ml).
  • Other gastric adenocarcinoma cell lines tested were unresponsive to TGF-beta 1.
  • TGF-beta 1 treatment led to DNA fragmentation and chromatin condensation, indicative of apoptosis.
  • Cell death and DNA fragmentation were partially inhibited by cycloheximide, suggesting a requirement for new protein synthesis.

Conclusions:

  • TGF-beta 1 effectively induces apoptosis and cell death in human gastric scirrhous carcinoma cells (HSC-39 and HSC-43) in vitro.
  • The apoptotic process appears to be mediated by the activation of a specific signal transduction pathway.
  • The differential response to TGF-beta 1 highlights potential therapeutic targets in gastric cancer treatment.

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