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黑皮质素受体-4在癫痫模型大鼠脑组织中的表达及相关机制

, PP. 2445-2450

Keywords: 癫痫,黑皮质素受体-,氯化锂-匹罗卡品,戊四氮,GluR

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Abstract:

目的探讨黑皮质素受体-4(melanocortin-4receptor,MC4R)在癫痫模型大鼠脑组织中的表达及可能的相关机制。方法将52只雄性SD大鼠分为对照组,6、24、72h、7、14、30、60d8个实验组,实验组建立氯化锂-匹罗卡品模型,采用Westernblot、免疫组织化学、免疫组织荧光法检测MC4R在模型大鼠脑组织中的表达及分布。另外40只雄性SD大鼠,分成正常对照组、戊四氮组(pentylenetetrazol,PTZ)、PTZ+0.9%NaCl组和PTZ+HS014组(HS014为MC4R特异性抑制剂),建立PTZ慢性点燃模型,记录各组发作情况。建模28d后将各组大鼠处死,Westernblot检测各组大鼠Phspo-GluR1(Ser845)的表达情况。结果与对照组相比,MC4R在氯化锂-匹罗卡品模型大鼠脑组织中呈动态升高趋势,并于第14天达峰值(P<0.01)。在PTZ慢性点燃过程中,与对照相比,经HS014干预大鼠的平均发作评分明显降低(P<0.05),全身强直阵挛发作(generalizedtonic-clonicseizure,GTCS)的潜伏期明显延长(P<0.05)。29d后Westernblot检测结果显示HS014处理组大鼠脑组织中的Phspo-GluR1(ser845)表达量较PTZ组明显下降(P<0.05)。结论MCR4可能通过调节GluR1的ser845位点的磷酸化水平参与到了癫痫的发生、发展中。

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