Protective effects and mechanism of heat shock response on cardiovascular system in rats after heat exposure

AIM:To study protective effects and mechanism of heat shock response (HSR) on cardiovascular system in rats after heat exposure.METHODS:The study was divided into 2 experiments:①Protective effects of HSR on cardiovascular system in rats after heat exposure.SD rats randomly allocated into 2 groups:heat shock group (HS group), sham control group(SC group).HS group were treated with heat shock, but SC group weren't.After re-covering for 20 h at room temperature, two groups exposed to death in thermal environment, and blood pressure and elec-trocardiogram were measured continuously.Through Chart software mean arterial pressure(MAP), existent time etc were acquired.②SD male rats randomly allocated into 3 groups:HS group, SC group and normal temperature control group(NC group).NC group weren't treated.The treatment in HS and SC group was identical with in the first experiment, but it would be terminated at 73 min after heat exposure, meanwhile content of MDA of myocardium were measured.RESULTS:① Existent time in HS group was longer than that in SC group and shock arrived later; ② During earlier period after heat exposure MAP had no significant changes between HS and SC group, but after 60 mins MAP in HS group were higher than that in SC group; ③ Compared with NC group, content of MDA in myocardium in SC group was higher significantly at 73 min after heat exposure. Howerer, content of MDA in HS group was lower than in SC group, and had no significant changes with NC group.CONCLUSION:Through decreasing production of MDA in myocardium, HSR has a protective effect on cardiovascular system in rats after heat exposure.