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Related Experiment Videos

Expression level of Bcl-2 determines anti- or proapoptotic function.

N Shinoura1, Y Yoshida, M Nishimura

  • 1Department of Molecular Biotherapy Research, Cancer Chemotherapy Center, Japanese Foundation for Cancer Research, Tokyo.

Cancer Research
|August 27, 1999
PubMed
Summary

Bcl-2 protein

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Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • Bcl-2 is an oncogene typically associated with anti-apoptotic functions.
  • Caspase-mediated cleavage of Bcl-2 converts it into a pro-apoptotic effector, challenging its role in cancer growth.
  • Understanding Bcl-2's dual role is crucial for cancer therapy development.

Purpose of the Study:

  • To investigate the antiapoptotic function of Bcl-2 in glioma cells under varying expression levels.
  • To compare the effects of Bcl-2 and Bcl-X(L) on Fas-mediated apoptosis in glioblastoma.
  • To elucidate the mechanisms underlying Bcl-2's pro- or anti-apoptotic activity.

Main Methods:

  • Adenovirus-mediated gene delivery (Adv-Bcl-2, Adv-Fas, Adv-FL) into U251 glioblastoma cells.
  • Assessment of apoptosis induction and caspase activity.

Related Experiment Videos

  • Analysis of mitochondrial membrane potential and structure changes.

    • Main Results:

    • Low-level Bcl-2 expression inhibited Fas-mediated apoptosis, while high-level expression promoted it.
    • Bcl-X(L) consistently exhibited antiapoptotic function against Fas-mediated apoptosis, regardless of expression level.
    • High-level Bcl-2 induction alone induced apoptosis and altered mitochondrial integrity, with increased cleaved Bcl-2 product correlating with viral load.

    Conclusions:

    • Bcl-2 exhibits context-dependent function, acting as antiapoptotic at low levels and proapoptotic at high levels in Fas-mediated apoptosis.
    • Bcl-X(L) provides a stable antiapoptotic effect against Fas-mediated apoptosis.
    • The findings suggest that high-level Bcl-2 expression may not be beneficial for cancer growth due to its proapoptotic conversion and mitochondrial disruption.