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Related Experiment Videos

Asynchrony and commitment to die during apoptosis

C A Messam1, R N Pittman

  • 1School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6084, USA.

Experimental Cell Research
|March 14, 1998
PubMed
Summary
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Apoptosis in PC12 cells is asynchronous, occurring over days. However, distinct morphological phases, including plasma membrane bubbling and cell body blebbing, define the process, allowing researchers to pinpoint the commitment to cell death.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Apoptosis, or programmed cell death, is crucial for development and tissue homeostasis.
  • Understanding the temporal dynamics of apoptosis is key to deciphering its role in disease and therapy.

Purpose of the Study:

  • To investigate the chronological sequence of morphological changes during apoptosis in individual PC12 cells.
  • To determine the timing of commitment to cell death relative to observable morphological events.

Main Methods:

  • Utilized time-lapse video microscopy to monitor PC12 cells undergoing apoptosis after serum removal.
  • Quantified the duration of distinct morphological phases and assessed the impact of serum addition on cell survival.

Main Results:

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  • Observed asynchronous cell death over a 2-3 day period, characterized by three distinct morphological phases.
  • Identified a rapid execution phase (Phase 3) lasting approximately 96 minutes, preceded by earlier phases with variable durations.
  • Demonstrated that serum addition can rescue cells up to Phase 2, indicating commitment to die occurs ~2-3 hours before Phase 3.

Conclusions:

  • Apoptosis, while asynchronous, exhibits reproducible morphological hallmarks.
  • These morphological changes provide a temporal framework for understanding critical events like commitment to cell death.