Distribution of cholesterol 24-hydroxylase in the monkey brain  

胆固醇24-羟化酶在猴脑中的表达(英文)

作　　者：和欣[1] 王维义[2] 华茜[3] 

机构地区：[1]北京中医药大学基础医学院解剖学教研室,北京100029 [2]新加坡国立大学杨璐龄医学院解剖学系,新加坡119260 [3]北京中医药大学基础医学院科研实验中心,北京100029

出　　处：《Neuroscience Bulletin》2010年第3期197-204,共8页神经科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.30901940);the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Education Ministry of China

摘　　要：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.目的大脑内胆固醇主要由自身合成且不易透过血脑屏障。因此,将脑内胆固醇转化成更易通过血脑屏障的24-羟胆固醇是保证其在脑内外转运动态平衡的关键。该转化过程主要依赖胆固醇24-羟化酶(cholesterol 24-hydroxylase)的作用来完成。本研究旨在探讨胆固醇24-羟化酶在猴脑中的表达。方法利用免疫组织化学技术观察胆固醇24-羟化酶在猴脑中的表达,并用光学显微镜和电子显微镜观察其表达部位。结果胆固醇24-羟化酶在大脑皮质、海马、杏仁核、Meynert基底核、纹状体以及小脑皮质的Purkinje神经元有中等强度的染色,且主要表达于神经元和神经纤维网。在丘脑、苍白球和脑干区,胆固醇24-羟化酶染色较浅。电子显微镜观察到胆固醇24-羟化酶表达在神经元轴突末端。结论大脑内胆固醇转运的主要场所是大脑投射神经元。此外,神经元轴突末端对维持脑胆固醇代谢平衡起关键作用。

关 键 词：AXON CHOLESTEROL cholesterol 24-hydroxylase OXYSTEROLS 

分 类 号：R741[医药卫生—神经病学与精神病学]