目的:探讨电针督脉对癫痫后脑损伤的神经保护作用及其神经保护作用机制。方法:采用侧脑室立体定位注射海人酸(KA)建立大鼠癫痫持续状态(SE)模型后进行电针督脉百会和筋缩穴合刺干预。首先通过尼氏染色实验观察电针督脉对痫症继发脑损伤是否有神经保护作用。进一步利用Western Blotting和Real-time PCR分析胆固醇代谢相关酶胆固醇24S-羟化酶(CYP46)在蛋白和基因水平上的变化。结果:长时间电针督脉可以有效改善KA诱导的SE继发脑损伤,调节胆固醇代谢酶CYP46的表达,并抑制KA诱导的CYP46 m RNA升高。结论:电针督脉可以通过影响胆固醇代谢途径对癫痫后的脑损伤发挥神经保护作用。
Objective Cholesterol 24-hydroxylase catalyzes the conversion of cholesterol to 24-hydroxycholesterol,which is a major pathway for cholesterol elimination from the brain,since 24-hydroxycholesterol can readily cross the blood brain barrier.The present study aimed to elucidate the distribution of cholesterol 24-hydroxylase in the monkey brain.Methods The distribution of cholesterol 24-hydroxylase in the monkey brain was examined using Western blot and immunohistochemistry methods,and was observed under light microscopy and electron microscopy.Results High levels of cholesterol 24-hydroxylase were observed in projection neurons and neuropil in structures derived from telencephalon,including the cerebral neocortex,hippocampus,amygdala,nucleus basalis of Meynert,and striatum.Electron microscopy revealed that the enzyme was localized in the axon terminals.One the other hand,cholesterol 24-hydroxylase was expressed at a lower level in the thalamus,globus pallidus and brainstem.Conclusion The high level of cholesterol 24-hydroxylase in the telencephalon possibly reflects a high rate of cholesterol turnover in this part of brain.
