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Time sequence analysis of caspase-3-independent programmed cell death and apoptosis in X-irradiated human leukemic

Hisako Nakano1, Kunio Shinohara

  • 1Department of Laboratory Animal Science, Tokyo Metropolitan Institute of Medical Science, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo 113-8613, Japan. nakano@rinshoken.or.jp

Cell and Tissue Research
|November 29, 2002
PubMed

Insights

Inhibiting caspase-3 in X-irradiated cells reduces apoptosis hallmarks but doesn't affect survival, revealing a caspase-3-independent programmed cell death pathway.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Caspase-3 is a key executioner enzyme in apoptosis.
  • Understanding cell death pathways is crucial for cancer research and therapy.

Purpose of the Study:

  • To investigate the mode of cell death induced by caspase-3 inhibition in X-irradiated human leukemic cells.
  • To characterize the structural and morphological changes associated with caspase-3 inhibition.

Main Methods:

  • Human leukemic MOLT-4 cells were irradiated with X-rays.
  • Cells were treated with caspase inhibitors (Ac-DEVD-CHO, Ac-YVAD-CHO, Ac-IETD-CHO).
  • Cell death was assessed using dye exclusion tests, and nuclear morphology and DNA laddering were analyzed.

Main Results:

  • Ac-DEVD-CHO and Ac-IETD-CHO inhibited apoptosis hallmarks like nuclear condensation and DNA laddering without affecting cell survival.
  • A novel, apoptosis-related nuclear morphology was observed in the presence of Ac-DEVD-CHO.
  • This caspase-3-independent cell death pathway developed approximately 4 hours later than classical apoptosis.

Conclusions:

  • Caspase-3 inhibition diminishes apoptosis expression but does not impact cell survival.
  • A distinct, caspase-3-independent programmed cell death pathway exists.
  • This pathway exhibits unique morphological features and a delayed onset compared to apoptosis.

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