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Related Experiment Videos

Bcl-2 blocks p53-dependent apoptosis

S K Chiou1, L Rao, E White

  • 1Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, New Jersey 08854.

Molecular and Cellular Biology
|April 1, 1994
PubMed
Summary
This summary is machine-generated.

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Adenovirus E1A induces cell proliferation but apoptosis. Coexpression with Bcl-2 or E1B proteins inhibits apoptosis, enabling cell transformation. Bcl-2 modifies p53 function, shifting it from apoptosis to growth arrest.

Area of Science:

  • Molecular biology
  • Cell biology
  • Virology

Background:

  • Adenovirus E1A protein drives cell proliferation but induces apoptosis, preventing transformation.
  • Adenovirus E1B proteins (19K and 55K) and human Bcl-2 inhibit apoptosis, facilitating E1A-induced transformation.
  • The p53 tumor suppressor gene product is crucial for E1A-induced apoptosis.

Purpose of the Study:

  • To investigate the role of apoptosis suppression in E1A-mediated cell transformation.
  • To determine if Bcl-2 inhibits p53-induced apoptosis.
  • To elucidate the mechanism by which Bcl-2 affects p53 function.

Main Methods:

  • Coexpression of Adenovirus E1A with E1B proteins or Bcl-2 in primary rodent cells.
  • Utilizing a temperature-sensitive p53 mutant (p53Val-135) to study p53-mediated apoptosis.

Related Experiment Videos

  • Assessing cell transformation, apoptosis, and cell cycle arrest.
  • Analyzing p53 nuclear localization and protein levels.

    • Main Results:

    • E1A transformation requires coupling of cell growth deregulation with apoptosis suppression.
    • Bcl-2 and E1B proteins promote high-frequency transformation by inhibiting apoptosis.
    • Bcl-2 prevents p53-mediated apoptosis and induces a reversible, leaky cell cycle arrest.
    • Bcl-2 does not alter p53 nuclear localization or protein levels, but diverts its function from apoptosis induction to growth arrest.

    Conclusions:

    • Cell transformation by E1A necessitates the suppression of apoptosis.
    • Bcl-2 functions as a modifier of p53, redirecting its activity towards growth arrest rather than apoptosis.
    • Bcl-2's ability to bypass p53-induced apoptosis contributes to its oncogenic and antiapoptotic properties.