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Related Experiment Videos

Hyperthermia induces apoptosis in thymocytes.

K S Sellins1, J J Cohen

  • 1Department of Microbiology and Immunology, University of Colorado School of Medicine, Denver 80262.

Radiation Research
|April 1, 1991
PubMed
Summary

Mild hyperthermia causes DNA fragmentation and cell death in mouse thymocytes. This process does not require protein or RNA synthesis, distinguishing it from radiation-induced cell death.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mild hyperthermia induces DNA fragmentation and cell death in murine thymocytes.
  • This DNA cleavage into oligonucleosome-sized fragments is similar to apoptosis.
  • The process requires incubation at 37 degrees C for detection.

Purpose of the Study:

  • To investigate the mechanism of DNA fragmentation and cell death induced by mild hyperthermia in murine thymocytes.
  • To differentiate hyperthermia-induced DNA fragmentation from radiation-induced DNA fragmentation.
  • To determine the requirement of protein and RNA synthesis in hyperthermia-induced cell death.

Main Methods:

  • Murine thymocytes were subjected to mild hyperthermia (43°C for 1 hour).
  • DNA fragmentation was assessed by gel electrophoresis.
  • Cell viability was determined.
  • The effects of protein synthesis inhibitors (cycloheximide, emetine) and RNA synthesis inhibitors (actinomycin D, 5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole) were evaluated.

Main Results:

  • Mild hyperthermia induced extensive double-stranded DNA fragmentation and subsequent cell death in thymocytes.
  • Incubation at 37°C was necessary for DNA fragmentation detection post-hyperthermia.
  • Protein and RNA synthesis were not required for hyperthermia-induced DNA fragmentation or cell death.
  • Inhibitors of protein and RNA synthesis did not block these effects in heated thymocytes, unlike in irradiated thymocytes.

Conclusions:

  • Hyperthermia-induced DNA fragmentation and cell death in thymocytes are distinct processes from radiation-induced cell death.
  • The observed DNA fragmentation is solely attributable to heating, not to prior irradiation.
  • These findings highlight a unique pathway for hyperthermia-induced cell death independent of active gene expression or protein synthesis.

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