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[Tolerance to induced systemic hyperthermia in the mouse]
Comptes Rendus Des Seances De La Societe De Biologie Et De Ses Filiales
|January 1, 1986
Summary
Pre-exposure to mild heat (systemic hyperthermia) in mice significantly increases tolerance to lethal heat. A 10-minute heat pretreatment at 42°C notably enhanced survival against subsequent severe hyperthermia.
Area of Science:
- Physiology
- Toxicology
- Thermoregulation
Background:
- Organisms can develop tolerance to harmful stimuli after initial exposure.
- Systemic hyperthermia is a condition where core body temperature rises significantly.
- Understanding heat tolerance mechanisms is crucial for managing heat-related illnesses.
Purpose of the Study:
- To investigate the development of thermotolerance in mice following systemic hyperthermia.
- To quantify the protective effect of varying durations of heat pre-exposure against lethal hyperthermia.
Main Methods:
- Mice were pre-exposed to 42.0°C for 5, 10, or 15 minutes.
- Subsequent lethal hyperthermia was administered at 42.0°C and 43.5°C.
- Lethal dose 50% (LD50) and thermotolerance ratio (TTR) were calculated.
Main Results:
- Pretreatment significantly increased LD50 values for both 42.0°C and 43.5°C exposures.
- A 10-minute pretreatment at 42.0°C yielded the highest TTR (2.35) one day post-exposure.
- Tolerance levels varied depending on the duration of pretreatment and the temperature of the subsequent heat exposure.
Conclusions:
- Short-term systemic hyperthermia can induce significant thermotolerance in mice.
- Pretreatment protocols can be optimized to enhance survival against severe heat stress.
- This study provides insights into the physiological mechanisms of heat adaptation.