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热习服对小鼠热射病脑损伤的保护作用

, PP. 1321-1324

Keywords: 热习服,热射病,脑损伤,保护作用

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Abstract:

目的探讨热习服对小鼠热射病脑损伤的保护作用。方法以C57小鼠分别建立热习服和热射病模型,实验分为对照组(CON组)、热习服组(HA组)、热射病组(HS组)、热习服后再接受热应激组(HA+HS组)。观察各组小鼠一般行为学表现、肛温变化、脑组织含水量及死亡率。HE染色观察病理改变,TUNEL染色观察神经元凋亡情况,透射电镜观察神经元形态改变。结果在43℃环境中暴露120min后,HS组肛温升高至(42.8±0.83)℃,死亡率为33%,脑组织含水量为(82.6±12.7)%;HA+HS组肛温升至(40.0±0.67)℃,未有动物死亡,脑组织含水量为(77.8±12.1)%,以上指标两组间差异具有统计学意义(PP<0.05)。组织病理观察可见HS组脑组织细胞肿胀,胞质疏松,染色质边集,核明显固缩,内质网短小分散,排列紊乱,线粒体明显增大,线粒体DNA固缩,空泡化等,并有大量神经元凋亡,HA+HS组亦可见类似病理变化及神经元凋亡,但病变程度明显轻于HS组,而对照(CON)组及单纯热习服(HA)组以上指标均无明显变化。结论热射病可导致小鼠脑组织水肿,脑组织结构改变,神经元凋亡增加,对中枢神经系统功能损伤严重。热习服预处理可减轻脑损伤,具有明显的保护作用。

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