Protein kinase C(PKC) is a multifunctional protein kinase which belongs to amultigene family of fundamental importance in growth regulation of the cells. Manystudies have indicated that the distinct isoenzymes exhibit...Protein kinase C(PKC) is a multifunctional protein kinase which belongs to amultigene family of fundamental importance in growth regulation of the cells. Manystudies have indicated that the distinct isoenzymes exhibit different cell functions.To further elucidate the functional role of specific forms of PKC in growth controland their possible molecular mechanisms, we have constructed the NRK cell modelthat overexpressed PKCβ I isoform for the first time. Furthermore, we have展开更多
目的:观察不同频率电针对脑缺血再灌注恢复期大鼠血脑屏障(BBB)开放效应,探讨电针促血脑屏障开放调控机制。方法:频率研究:150只健康雄性SD大鼠建立大脑中动脉闭塞(MCAO)模型,饲养3周后,按随机原则分为模型组、假手术组及2、15、30、50...目的:观察不同频率电针对脑缺血再灌注恢复期大鼠血脑屏障(BBB)开放效应,探讨电针促血脑屏障开放调控机制。方法:频率研究:150只健康雄性SD大鼠建立大脑中动脉闭塞(MCAO)模型,饲养3周后,按随机原则分为模型组、假手术组及2、15、30、50、100Hz组。检测大鼠脑含水量以及伊文思蓝(EB)透过量。机制研究:180只SD大鼠建立MCAO模型,饲养3周后,随机分为模型组、假手术组、电针组、假电针组、电针+PKC抑制剂组;检测大鼠大脑皮层蛋白激酶C亚型β1(PKCβ1)的磷酸化水平、P-糖蛋白(P-gp)以及mdr1a、mdr1b m RNA的表达。结果:2Hz组、100Hz组大鼠脑组织EB含量明显升高(P<0.05);模型组与其余4组比较,大鼠脑组织含水量差异无统计学意义。与模型组比较,2Hz组大鼠大脑皮层的PKCβ1、p-PKCβ1/PKCβ1均显著提高(P<0.05),电针组P-gp的IHS评分显著降低(P<0.05),电针组mdr1、mdr1b m RNA的表达均明显降低(P<0.05);电针+PKC抑制剂组mdr1a m RNA表达高于电针组(P<0.05)。结论:2Hz、100Hz电针刺激对脑缺血再灌注恢复期大鼠BBB均具有一定开放效应,且无明显脑水肿出现;电针诱导大鼠BBB开放可能是通过促使PKCβ1磷酸化,下调药物外排系统P-gp、mdr1a m RNA,抑制P-gp在大脑皮层毛细血管内皮细胞的表达实现。展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘Protein kinase C(PKC) is a multifunctional protein kinase which belongs to amultigene family of fundamental importance in growth regulation of the cells. Manystudies have indicated that the distinct isoenzymes exhibit different cell functions.To further elucidate the functional role of specific forms of PKC in growth controland their possible molecular mechanisms, we have constructed the NRK cell modelthat overexpressed PKCβ I isoform for the first time. Furthermore, we have
文摘目的:观察不同频率电针对脑缺血再灌注恢复期大鼠血脑屏障(BBB)开放效应,探讨电针促血脑屏障开放调控机制。方法:频率研究:150只健康雄性SD大鼠建立大脑中动脉闭塞(MCAO)模型,饲养3周后,按随机原则分为模型组、假手术组及2、15、30、50、100Hz组。检测大鼠脑含水量以及伊文思蓝(EB)透过量。机制研究:180只SD大鼠建立MCAO模型,饲养3周后,随机分为模型组、假手术组、电针组、假电针组、电针+PKC抑制剂组;检测大鼠大脑皮层蛋白激酶C亚型β1(PKCβ1)的磷酸化水平、P-糖蛋白(P-gp)以及mdr1a、mdr1b m RNA的表达。结果:2Hz组、100Hz组大鼠脑组织EB含量明显升高(P<0.05);模型组与其余4组比较,大鼠脑组织含水量差异无统计学意义。与模型组比较,2Hz组大鼠大脑皮层的PKCβ1、p-PKCβ1/PKCβ1均显著提高(P<0.05),电针组P-gp的IHS评分显著降低(P<0.05),电针组mdr1、mdr1b m RNA的表达均明显降低(P<0.05);电针+PKC抑制剂组mdr1a m RNA表达高于电针组(P<0.05)。结论:2Hz、100Hz电针刺激对脑缺血再灌注恢复期大鼠BBB均具有一定开放效应,且无明显脑水肿出现;电针诱导大鼠BBB开放可能是通过促使PKCβ1磷酸化,下调药物外排系统P-gp、mdr1a m RNA,抑制P-gp在大脑皮层毛细血管内皮细胞的表达实现。
