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Ca 2+ -dependent autophagy is enhanced by the pharmacological agent PK11195

Annalisa Gastaldello1, Holly Callaghan, Priya Gami

  • 1Royal Veterinary College, University of London, London UK.

Autophagy
|May 1, 2010
PubMed

Insights

PK11195 enhances calcium-mediated autophagy by targeting the Bcl-2 oncogene, acting as a tool to study cellular homeostasis and autophagy. This compound

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • PK11195, a known apoptosis enhancer, targets the Bcl-2 oncogene.
  • PK11195 modulates intracellular calcium levels, including in the endoplasmic reticulum, mitochondria, and cytosol.
  • The role of PK11195 in pharmacologically induced macroautophagy remains to be fully elucidated.

Purpose of the Study:

  • To investigate the contribution of PK11195 to models of pharmacologically induced macroautophagy.
  • To determine the effect of PK11195 on macroautophagy in HeLa cervix carcinoma cells.
  • To ascertain the role of Bcl-2 in PK11195-mediated autophagy.

Main Methods:

  • Monitoring LC3 distribution and post-transcriptional modifications.
  • Utilizing calcium-dependent (ATP, Vitamin D3) and independent (Rapamycin, H2O2) autophagy stimuli.
  • Employing Bcl-2 deletion models to assess PK11195's mechanism of action.

Main Results:

  • PK11195 demonstrated a pro-autophagy role when combined with ATP and Vitamin D3.
  • PK11195 was ineffective in promoting autophagy with Rapamycin and H2O2.
  • Bcl-2 deletion abrogated the effects of PK11195, indicating a selective action against Bcl-2.

Conclusions:

  • PK11195 facilitates calcium-mediated autophagy.
  • PK11195 serves as a valuable tool for investigating Bcl-2's role in autophagy.
  • Understanding PK11195's mechanism can provide insights into cellular homeostasis and catabolic processes.

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