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Cepharanthin reduces thermotolerance by enhancing thermosensitivity in NIH3T3 cells.

M Kuroda1, S Kawasaki, Y Hiraki

  • 1Department of Radiology, Okayama University Medical School, Japan.

Acta Medica Okayama
|June 1, 1992
PubMed
Summary

Cepharanthin (Ce) reduces heat resistance in NIH3T3 cells by increasing heat sensitivity, not by blocking thermotolerance development. Glycyrrhizin (G) and verapamil (V) showed combined effects, while Ce was most effective alone.

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Area of Science:

  • Cellular biology
  • Biochemistry
  • Heat shock response

Background:

  • Thermotolerance is a protective cellular response to heat stress.
  • Acquisition of thermotolerance requires metabolic processes.
  • Certain compounds may modulate cellular responses to heat.

Purpose of the Study:

  • To investigate the effects of cepharanthin (Ce), glycyrrhizin (G), and verapamil (V) on induced thermotolerance in NIH3T3 cells.
  • To determine the mechanism by which Ce affects thermotolerance.
  • To evaluate the combined effects of G and V on thermotolerance.

Main Methods:

  • NIH3T3 cells were subjected to a two-stage heating protocol with or without drug treatment.
  • Drugs were administered during different experimental phases (heating, incubation, or throughout).

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  • Cell survival was assessed after the second heat exposure to evaluate thermotolerance.

    • Main Results:

    • Control cells developed significant thermotolerance after a 12h incubation at 37°C.
    • Cepharanthin (Ce) or the combination of glycyrrhizin (G) and verapamil (V) reduced thermotolerance when present throughout the experiment.
    • Ce suppressed thermotolerance when added during the second heating phase, indicating enhanced thermosensitivity.

    Conclusions:

    • Cepharanthin (Ce) reduces thermotolerance by increasing cellular thermosensitivity.
    • The development of thermotolerance is dependent on metabolic processes during incubation.
    • Ce may be a valuable tool for understanding and potentially manipulating cellular heat responses.