PC12细胞对雌激素应答反应特征

来源 :中国神经科学学会第九届全国学术会议暨第五届会员代表大会 | 被引量 : 0次 | 上传用户:tanwenbin89
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  目的 在中枢神经系统中雌激素的作用是多方面的,雌激素不仅作用于脑内与生殖相关的神经回路影响生殖过程,而且还作用于与认知功能相关的神经回路,参与5-羟色胺、多巴胺、谷氨酸、GABA和乙酰胆碱等神经递质和多种神经肽活动的调节,影响突触可塑性和学习记忆.同时,雌激素在神经细胞的分化和发育、神经元存活和轴突生长的诱导以及新生神经元的形成等诸多过程中也发挥重要作用.方法 本研究利用PC12细胞作为实验材料,用细胞计数法观察PC12细胞在无酚红1640培养基中加入不同浓度血清条件下的生长情况;并对PC12细胞进行血清饥饿不同时间检测细胞凋亡;最后利用MTT法测定不同浓度雌激素在低血清浓度下的生长情况来观察PC12细胞的雌激素应答反应模式.旨在为研究雌激素在神经保护中的作用提供实验基础.结果 (1)在无酚红1640培养基中加入15%和2.5%浓度血清均能使PC12细胞生长,且倍增时间没有显著性差异;加入1%浓度血清后PC12细胞生长速度明显减慢,倍增时间明显延长(P<0.05).(2)血清饥饿PC12细胞4h后MAPK磷酸化水平显著升高(P<0.05)、8h后Akt磷酸化水平显著升高(P<0.05): Hoechst染色显示,血清饥饿PC12细胞4h时开始细胞呈现凋亡趋势,且随时间延长凋亡明显.(3) PC12细胞在低浓度血清短时间培养下没有明显变化;长时间培养下加入不同浓度雌激素(10-15-10-5 M)后,雌激素浓度为10-5 M时对PC12细胞的生长起到抑制作用.结论 PC12细胞经血清饥饿2h后,在低血清浓度培养基中长时间培养,对不同浓度雌激素的应答为高浓度抑制生长,其他浓度无显著影响.
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