宫内乙醇暴露对胎鼠大脑线粒体蛋白质组的影响

目的:探讨宫内乙醇暴露对胚胎大脑线粒体蛋白组的影响.方法:CD-1孕鼠随机分成对照组和5.0g/kg乙醇染毒组,染毒期为孕6～15 d,孕18天剖腹取胎,选取没有明显外观畸形的胎鼠进行实验.提取胎鼠大脑线粒体进行全蛋白双向凝胶电泳分析,并用质谱鉴定差异表达的蛋白点,同时进行线粒体呼吸酶活性和大脑细胞ATP含量检测.结果:宫内乙醇暴露组胎鼠大脑线粒体蛋白表达发生改变.呼吸酶复合物Ⅳ(相当于对照组的72.3%±4.6%)和三磷酸腺苷(ATP)合成酶活性(相当于对照组的80.3%±5.1%)均较对照组降低,大脑细胞内ATP含量下降(相当于对照组的67.9%±3.9%).结论:宫内乙醇暴露能够影响胚胎大脑线粒体蛋白表达,即使没有出现明显的形态畸形,胚胎大脑细胞能量状态已经受到影响,可能与孕期饮酒导致的后代神经行为障碍有关.

In utero ethanol exposure alters the mitochondrial protein expression of fetal mouse cerebrum

OBJECTIVE: To probe the effect of prenatal ethanol exposure on the mitochondrial protein expression in fetal mouse cerebrum. METHODS: Pregnant CD-1 mice were given 5.0 g/kg ethanol intragastrically from pregnant days (PD) 6-15. Fetal cerebral mitochondria were isolated on PD 18. The overall mitochondrial protein was applied to two-dimensional gel electrophoresis. Differentially expressed protein spots were cut off and identified by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. Activities of respiratory chain complex IV (72.3%+/-4.6% of control) and ATP synthase, and ATP content in the fetal cerebral cells were measured. RESULTS: Expressions of some constructional and functional proteins were altered by in utero ethanol exposure. Activities of respiratory chain complex IV and ATP synthase (80.3%+/-5.1% of control) were both decreased. ATP content (67.9%+/-3.9% of control) in the cerebral cells was reduced in the in utero ethanol exposure fetuses. CONCLUSION: In utero ethanol exposure affects the mitochondrial protein expression of fetal mouse cerebrum, even in the tissue without obvious morphological malformations, which may be a possible mechanism of behavioral defects found in children with prenatal ethanol exposure.