Heat shock protein expression protects against death following exposure to heatstroke in rats.
Rats 0, 16, or 48 h after heat shock (42 degrees C core temperature for 15 min) or chemical stress (5 mg/kg sodium arsenite, i.p.) were exposed to a high ambient temperature (43 degrees C) to induce heatstroke onset. The moment in which the mean arterial pressure and cerebral blood flow began to decrease from their peak values was taken as the onset of heatstroke. Prior heat shock or chemical stress conferred significant protection against heatstroke-induced arterial hypotension, cerebral ischemia, cerebral neuronal damage and death, and correlated with expression of HSP72 in brain, heart, liver and kidney at 16 h. However, at 48 h, when HSP72 expression returned to basal values, the above responses that occurred after the onset of heatstroke of two groups (0 h group VS 48 h group) were indistinguishable. The data suggest that HSP72 presence increases survival in rat heatstroke by attenuating arterial hypotension, cerebral ischemia and neuronal damage.
Department of Physiology, National Cheng-Kung University, Tainan, Taiwan.
Y L
YL
Yang
K T
KT
Lu
H J
HJ
Tsay
C H
CH
Lin
M T
MT
Lin
D000818:Animals; D018053:Arsenites; D001794:Blood Pressure; D001923:Brain Chemistry / Q000502:physiology; D002545:Brain Ischemia / Q000139:chemically induced / Q000378:metabolism* / Q000401:mortality; D016923:Cell Death / Q000502:physiology; D002470:Cell Survival / Q000502:physiology; D002560:Cerebrovascular Circulation / Q000502:physiology; D004791:Enzyme Inhibitors; D050884:HSP72 Heat-Shock Proteins; D018883:Heat Stroke / Q000378:metabolism*; D006360:Heat-Shock Proteins / Q000096:biosynthesis*; D007375:Interleukin-1 / Q000502:physiology; D007668:Kidney / Q000737:chemistry; D017078:Laser-Doppler Flowmetry; D008099:Liver / Q000737:chemistry; D008297:Male; D009206:Myocardium / Q000737:chemistry; D009474:Neurons / Q000166:cytology* / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D017670:Sodium Compounds; D016019:Survival Analysis
D018053:Arsenites; D004791:Enzyme Inhibitors; D050884:HSP72 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D007375:Interleukin-1; D017670:Sodium Compounds; C017947:sodium arsenite