Olig对少突胶质细胞介导脱髓鞘大鼠髓鞘再生的影响

目的探讨Olig在少突胶质细胞介导的脱髓鞘大鼠髓鞘再生中的作用。方法 40只健康Wistar大鼠,随机分成正常组、模型对照组、模型组、实验组,用形态学观察和免疫组织化学检测Olig1和Olig2的表达。结果正常组Olig1位于少突胶质细胞的胞质,模型组胞核表达明显增多,实验组Oligl又重新转移至胞质;正常组Olig2表达位于胞核,模型组中有少量表达于胞质。结论在Olig1和Olig2同时缺失时,导致全脑不能形成少突胶质细胞,严重影响髓鞘的再生。

Effect of adenovirus-mediated gene transfer of Olig1 on oligodendrocyte differentiation and remyelination in a rat model of focal cerebral ischemia

BACKGROUND： The transcription factor Oligl is required for oligodendrocyte maturation and demyelinated lesion repair, and is a key regulator of myelinogenesis following ischemia. OBJECTIVE： To examine the efficacy of intraventricular injection of a recombinant adenovirus-expressing Oligl gene （Ad5-Oligl-eGFP） on oligodendrocyte maturation and myelin repair following focal cerebral ischemia. DESIGN, TIME AND SETTING： A randomized, controlled, animal experiment was performed at the Department of Neurology, Beijing Friendship Hospital Affiliated to Capital Medical University from January 2007 to March 2008. MATERIALS： Adenovirus and a recombinant adenovirus containing Oiigl gene （Ad5-Oligl） were provided by Vector Gene Technology, China. METHODS： All 50 rats were induced by middle cerebral artery occlusion. A total of 46 rats were successfully induced and were subsequently randomly assigned to a adenovirus （Ad5） group and recombinant adenovirus-expression Oligl gene （Ad5-Oligl） group, with 23 rats per group. One day after middle cerebral artery occlusion, either Ad5-Oligl-eGFP or Ad5-eGFP （10 μL, 2.3 ×10^11/mL） was injected into the lateral ventricle on the ischemic hemisphere. MAIN OUTCOME MEASURES： Adenovirus-mediated Oligl gene expression in vitro and in vivo was measured by reverse transcription-polymerase chain reaction and immunofluorescence, respectively. Myelin basic protein （MBP） levels were evaluated by Western Blot, immunostaining, and electron microscopy. RESULTS： Exogenous Oligl expression was measured at the periventricular zone of the lateral ventricle 1 day after Ad5-Oligl injection. In the Ad5-Oligl-treated group, MBP protein levels and average intensity of MBP-immunoreactivity （-ir） increased 28 days after middle cerebral artery occlusion, compared with the control group （P 〈 0.01, P 〈 0.05）. Furthermore, myelinated axonal numbers markedly increased following Ad5-Oligl treatment. CONCLUSION： The present data suggested that Ad5-Oligl gene therapy increased MBP expression and the number of remyelinating axons following cerebral ischemia.

Olig1转录因子在大鼠脊髓发育过程中的表达

目的:检测Olig1转录因子在大鼠脊髓发育过程中的表达情况。方法:选取胚胎14.5 d、18.5 d和出生后当天、出生后3 d、7 d、2周、4周及成年的大鼠脊髓,采用免疫荧光法和RT-PCR检测Olig1在脊髓的表达。结果:从胚胎14.5 d到成年大鼠的脊髓中Olig1均有表达。结论:Olig1在少突胶质细胞不同发育时期均有表达。

Olig家族调控脑白质损伤后神经修复的研究进展

少突胶质细胞是中枢神经系统（central nervous system．CNS）的髓鞘形成细胞．它们能易化神经传导，对神经功能有支持作用。与神经元类似，少突胶质细胞对于损伤，如缺血、缺氧和营养物质的缺乏等也高度敏感．导致髓鞘的脱失和变性。碱性-螺旋-环-螺旋（basichelix—loop—helix,bHLH）转录因子Oligl和Olig2主要表达于少突胶质细胞及其前体细胞，并在少突胶质细胞的产生和分化中发挥了很重要的作用。