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Gam1-associated alterations of drug responsiveness through activation of apoptosis

Fangting Wu1, Susanna Chiocca, William T Beck

  • 1Department of Medical Microbiology, Southern Illinois University School of Medicine, Springfield, IL 62794, USA.

Molecular Cancer Therapeutics
|June 19, 2007
PubMed

Insights

Avian adenovirus CELO protein Gam1 inhibits sumoylation, leading to cell growth inhibition and apoptosis. Gam1 also enhances sensitivity to chemotherapy drugs by activating caspase pathways.

Area of Science:

  • Molecular biology
  • Cellular biology
  • Virology

Background:

  • Sumoylation regulates diverse cellular pathways.
  • Avian adenovirus CELO encodes an early gene product, Gam1.
  • Gam1 is identified as an inhibitor of the sumoylation machinery.

Purpose of the Study:

  • To investigate the function of Gam1 in sumoylation.
  • To determine the effects of Gam1 on cell growth and apoptosis.
  • To explore the role of Gam1 in chemosensitivity.

Main Methods:

  • Assessing sumoylation inhibition by Gam1.
  • Measuring cell growth inhibition and apoptosis induction.
  • Detecting caspase-3 activity via immunostaining and Western blot.
  • Evaluating chemosensitivity to various agents.

Main Results:

  • Gam1 suppressed both constitutive and inducible sumoylation.
  • Gam1 induced significant cell growth inhibition and apoptosis.
  • Gam1 activated caspase-3.
  • Gam1 sensitized cells to DNA-damaging and non-DNA-damaging agents.

Conclusions:

  • Gam1-induced apoptosis is mediated, at least in part, by caspase pathway activation.
  • Gam1 contributes to cell growth inhibition and enhanced chemosensitivity.
  • Gam1 represents a novel regulator of sumoylation with implications for cancer therapy.

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