乙醇对金黄地鼠胚胎神经上皮细胞Bcl-2和Bax蛋白表达的影响

Effects of Alcohol Exposure on the Expression of Bcl-2 and Bax in Embryonic Neuroepithelial Cells in Golden Hamster

目的探讨乙醇染毒对金黄地鼠胚胎神经上皮细胞内B细胞淋巴瘤/白血病-2(B-celllymphoma/leukemia-2,Bcl-2)基因和Bcl相关蛋白(Bcl-associatexprotein,Bax)表达的影响。方法成年未经产金黄地鼠48只,实验组分6组,每组5只;对照组分6组,每组3只。实验组于孕7.5d腹腔注射乙醇,剂量为5.8g/kg,分别于4、8、16、24、48和72h后剖腹取胎,用免疫组织化学和图象分析技术对各期鼠胚神经上皮的Bcl-2和Bax的表达进行检测。对照组腹腔注射生理盐水。结果对照组Bcl-2和Bax正常分布于金黄地鼠胚胎神经上皮和周围间充质的核膜和胞浆,随时间推移,二者的表达量逐渐增高,于处理后16h达到高峰,与对照组相比,升高有统计学意义(P<0.01),之后逐渐下降。各实验组胚胎神经上皮细胞的Bcl-2免疫组化染色强度均不同程度地低于对照组,Bax的表达在8h低于对照组,其他各组均不同程度地高于对照组。结论乙醇能抑制Bcl-2的表达,促进Bax的表达,从而参与了乙醇致神经管畸形中细胞凋亡的调节。

Objective To explore the expression of Bcl-2 and Bax in embryonic neuroepithelial cells in Golden hamster exposured to the teratogenic dose of alcohol. Methods The experimental pregnant golden hamsters were given ethanol through intraperitoneally injected, 5.8 g/kg body weight. The Bcl-2 and Bax expressions in neuroepithelial cells of experimental and control animals were detected with immunohistochemical and image analysis at 4,8,16,24,48 and 72 h time points after treatment. Results Bcl-2 and Bax proteins distributed in nuclear membranes and cytoplasm of the neuroepithelial cells as well as mesenchymal cells. In control groups, the expressions of these two kind proteins increased as the time passed at beginning, 16 hours after, came to the summit and then descended gradually. Compared with the control, the expressions of Bcl-2 in experimental groups were down-regulated, expressions of Bax were up-regulated except at 8 h time point. Conclusion Alcohol can induce down-regulation of the expression of Bcl-2 protein and up-regulation of the expression of bax protein, which may play a an important role in regulation of apoptosis in alcohol-induced neural tube malformation.