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Involvement of c-Src kinase in the regulation of TGF-beta1-induced apoptosis

Seok Soon Park1, Young-Woo Eom, Eun Hee Kim

  • 1Institute for Medical Sciences, Ajou University School of Medicine, 5 Wonchon-Dong, Paldal-Gu, Suwon 442-749, Korea.

Oncogene
|June 23, 2004
PubMed

Insights

Transforming growth factor-beta1 (TGF-beta1) induces apoptosis in liver cells. However, increased c-Src activity may promote resistance to TGF-beta1, contributing to hepatocellular carcinoma (HCC) development.

Area of Science:

  • Hepatology
  • Molecular Biology
  • Cancer Research

Background:

  • Transforming growth factor-beta1 (TGF-beta1) induces apoptosis in normal hepatocytes.
  • Acquiring resistance to TGF-beta1 is a critical step in hepatocellular carcinoma (HCC) development.

Purpose of the Study:

  • Investigate the role of c-Src in regulating TGF-beta1-induced apoptosis in hepatocytes.
  • Determine if c-Src activity influences TGF-beta1 resistance in HCC.

Main Methods:

  • Utilized FaO hepatoma cells sensitive to TGF-beta1.
  • Examined c-Src activation, translocation, and degradation in response to TGF-beta1.
  • Assessed the impact of c-Src inhibition and activation on apoptosis.
  • Analyzed c-Src activity in HCC cell lines resistant to TGF-beta1.

Main Results:

  • TGF-beta1 induced transient c-Src activation and subsequent caspase-mediated degradation, leading to apoptosis.
  • Inhibition of c-Src enhanced TGF-beta1-induced apoptosis.
  • Overexpression of active c-Src inhibited apoptosis and suppressed TGF-beta1 signaling.
  • Resistant HCC cell lines exhibited elevated c-Src activity.

Conclusions:

  • Activated c-Src plays a regulatory role in TGF-beta1-induced apoptosis.
  • Elevated c-Src activity in HCC may confer resistance to TGF-beta1's apoptotic and antiproliferative effects.
  • Targeting c-Src could be a potential strategy for HCC treatment.

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