低氧预适应增强大鼠海马神经元的耐缺氧能力

Hypoxic preconditioning enhances hypoxic tolerance of hippocampal neurons and synaptic function of rat

本研究对整体大鼠进行了模拟不同海拔高度 (30 0 0、5 0 0 0m)的低氧预适应 ,然后观察了急性致死性缺氧对这些大鼠海马脑片诱发群锋电位的影响。结果显示 ,经低氧预适应的大鼠其海马脑片在给予急性缺氧后 ,CA1区缺氧损伤电位 (hypoxicinjurypotential,HIP)出现时间以及突触前排放 (presynapticvolley ,PV)消失时间均明显延迟 ;其中 5 0 0 0m预适应组的延迟程度比 30 0 0m组明显。复氧后 ,PV的恢复率在 30 0 0m和 5 0 0 0m低氧预适应组均明显高于对照组。本研究结果提示 。

Hypoxic preconditioning with different simulated altitudes (3?000 m and 5?000 m) was performed on Wistar rats and the evoked population spikes were recorded from the hippocampal slices of these rats. The results showed that the appearance of hypoxic injury potential (HIP) and the disappearance of presynaptic volley (PV) were significantly delayed in response to acute lethal hypoxia. HIP and PV delay became more apparent when the hypoxic preconditioning altitude was increased from 3?000 m to 5?000 m. After reoxygenation, the recovery rate of PV in hypoxic preconditioning groups at 3?000 m and 5?000 m was apparently higher than that of control. The above results suggest that hypoxic preconditioning of animals in vivo increases hypoxic tolerance of hippocampal neurons.