吡咯喹啉醌对D-半乳糖致衰老大鼠海马神经元的影响

目的观察吡咯喹啉醌(PQQ)对D-半乳糖(D-gal)致大鼠海马神经细胞衰老的影响。方法用大剂量D-gal致大鼠脑老化模型,侧脑室注射PQQ,50 d后行脑组织切片H-E染色和尼氏染色,观察海马神经元的形态学变化,流式细胞仪检测细胞的凋亡率;用TBA法和Fenton反应测海马组织自由基含量;W estern b lot观察C-FOS蛋白的表达。结果D-gal处理组鼠海马神经元胞体变小,尼氏小体的吸光度值(A)降低,细胞凋亡率和自由基含量增加,C-FOS蛋白的表达降低;而同时PQQ处理后,与对照组相比海马神经元的胞体变大,尼氏小体的A值增加,自由基含量和神经元的凋亡率无明显增加,PQQ剌激了C-FOS蛋白的表达。结论PQQ能延缓D-gal引起的大鼠海马神经细胞衰老。

Effect of PQQ on the hippocampal neurons of aging rat induced by D-galactose

Objective To investigate the effects of pyrroloquinoline quinone(PQQ) on the hippocampal neurons of aged rats induced by D-galactose(D-gal).Methods D-gal was used to induce the model of aging rat,PQQ was administered into rat lateral intracerebroventricle.After 50 days the metamorphosis of hippocampal neurons was observed by H-E and Nissl's staining.The apoptosis rate of hippocampus was tested by flow cytometry.The contents of free radical and C-FOS protern were measured.Results Compared with the control group,the size of the neurosoma was slightly changed,the optical density of Nissl's was decreased,the content of free radical and the apoptosis rate increased markedly in D-gal group.After PQQ injection with D-gal,the size of neurosoma and the optical density of Nissl's were markedly increased,the content of free radical and the apoptosis rate of hippocampus did not change.PQQ improved the expression of C-FOS protern.Conclusion PQQ can slow down the aging progress of hippocamal neurons induced by D-gal.