正加速度致脑损伤和学习记忆障碍的多重机制假说

作者利用动物离心机较系统地研究了高G暴露对脑的影响及其机制，联系国内外加速度生理研究最新进展，提出了高G致脑损伤和学习记忆障碍的多重机制假说，认为高G暴露引起的脑缺血是导致脑损伤和学习记忆障碍的主要原因，其生物化学及分子生物学机制涉及脑能量代谢降低、脑离子平衡紊乱、血脑屏障通透性增加、脑一氧化氮合酶和c—fos表达增加及热休克蛋白(HSP70)的保护作用等；颅内压力剧烈变化和应力增加是高G致脑损伤的重要因素之一；血液流变学特性改变在高G致脑损伤中起一定作用。

Multiple Mechanism Hypothesis on +Gz-induced Brain Injury and Dysfunction of Learning and Memory

We systematically studied the effect of high sustained +Gz on the brain and its mechanism in past ten years by animal centrifuge experiments. On the basis of the facts we observed and the more recent advances in acceleration physiology, we put forward a compound mechanism hypothesis to offer a possible explanation for +Gz-induced brain injury and dysfunction of learning and memory. It states that, ischemia during high G exposure might be the main factor accounting for + Gz-induced brain injury and dysfunction of learning and memory, including transient depression of brain energy metabolism, disturbance of ion homeostasis, increased blood-brain barrier permeability, increased brain nitric oxide synthase and c-fos expression, and the protective effect of heat shock protein 70(HSP70). In addition, the large rapid change of intracranial pressure and increased stress during +Gz exposure, and the hemorrheologic change after +Gz exposure might be one of the important factors accounting for +Gz-induced brain injury and dysfunction of learning and memory.