Related Experiment Videos
Tissue-specific HSP70 response in animals undergoing heat stress
S W Flanagan1, A J Ryan, C V Gisolfi
1Department of Exercise Science, University of Iowa, Iowa City 52242.
The American Journal of Physiology
|January 1, 1995
Summary
Rapid heating during heatstroke causes less thermal load and more 72-kDa heat shock protein (HSP72) in the liver. This suggests specific organs are vulnerable to heat injury.
Area of Science:
- Physiology
- Biochemistry
- Toxicology
Background:
- Heatstroke is a severe, potentially fatal condition.
- Increased heat storage rate elevates the risk of thermal injury.
- 72-kDa heat shock protein (HSP72) serves as a marker for thermal injury.
Purpose of the Study:
- To identify organs synthesizing HSP in hyperthermic animals.
- To compare HSP72 levels following high heating rate (HHR) versus low heating rate (LHR).
Main Methods:
- Rats were exposed to hyperthermia under control, HHR, or LHR conditions until colonic temperature reached 42°C.
- Tissue-specific HSP72 synthesis was analyzed.
- Thermal load was quantified by time spent above 40.4°C.
Main Results:
- High heating rate (HHR) exposure resulted in significantly lower total time in heat and thermal load compared to LHR.
- Hyperthermia induced HSP72 in the liver, small intestine, and kidney, but not brain or muscle.
- HHR animals exhibited greater HSP72 accumulation in the liver than LHR animals.
Conclusions:
- HSP72 synthesis is tissue-specific during hyperthermia.
- The liver may be a critical target tissue for early thermal damage.
- Rapid heating rates may exacerbate tissue-specific thermal injury responses.