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Two distinct modes of hyperthermic cell death.

C A Vidair¹, W C Dewey

¹Department of Radiation Oncology, University of California, San Francisco 94143.

Radiation Research

|October 1, 1988

Summary

Heat-stressed Chinese hamster ovary cells exhibit two distinct death modes: rapid cell detachment and inhibited synthesis, or slow death with multinucleation. Increased heat dose favors the rapid death pathway.

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Area of Science:

Cell Biology
Biophysics

Background:

Heat stress is a significant factor affecting cell viability.
Understanding cell death mechanisms is crucial for various biological and medical applications.

Purpose of the Study:

To investigate the distinct modes of cell death in heat-treated Chinese hamster ovary cells.
To elucidate the relationship between heat dose and the predominant death pathway.

Main Methods:

Culturing Chinese hamster ovary cells in plateau phase.
Applying controlled heat sterilization treatments.
Monitoring cell detachment, macromolecular synthesis rates (protein, RNA, DNA), plating efficiency, and cell ploidy.

Main Results:

Two primary modes of cell death were observed: a rapid mode (cell detachment, inhibited synthesis) and a slow mode (reduced plating efficiency, multinucleation).
The rapid death mode predominated with increasing heat dose and decreasing surviving cell fraction.
Multinucleated cells, though non-clonogenic, were a hallmark of the slow death mode.

Conclusions:

Heat-induced cell damage manifests in two distinct ways, suggesting either separate cellular targets or a single target with dose-dependent effects.
The observed death modes provide insights into cellular responses to thermal stress.

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