达方吡啶(Dalfampridine)改善大脑中动脉闭塞大鼠感觉运动功能

2012-02-06 MedSci MedSci原创

  许多卒中患者会遗留永久的功能缺损,包括运动、感觉和认知功能障碍,这直接影响患者的生活质量和日常能力。卒中后脱髓鞘或白质损伤在慢性功能缺损中的作用尚未明确。   近日,在2010国际卒中大会上报告的最新研究结果表明,达方吡啶能改善大脑中动脉闭塞后大鼠的感觉运动功能,脑白质损伤可能参与了闭塞后长期的功能缺损。未来应在遗有慢性神经功能缺损卒中患者的对照临床研究中进一步评估达方吡啶,以明确该药的潜在

  许多卒中患者会遗留永久的功能缺损,包括运动、感觉和认知功能障碍,这直接影响患者的生活质量和日常能力。卒中后脱髓鞘或白质损伤在慢性功能缺损中的作用尚未明确。

  近日,在2010国际卒中大会上报告的最新研究结果表明,达方吡啶能改善大脑中动脉闭塞后大鼠的感觉运动功能,脑白质损伤可能参与了闭塞后长期的功能缺损。未来应在遗有慢性神经功能缺损卒中患者的对照临床研究中进一步评估达方吡啶,以明确该药的潜在风险和获益。

  钾通道阻滞剂达方吡啶(Dalfampridine)能够加快脱髓鞘轴索的动作电位传导,其临床研究已遍及诸多神经疾患,一种缓释剂型最近被批准用于改善多发性硬化患者的行走能力。

  研究者对雄性SD大鼠(N = 15)进行持久性大脑中动脉闭塞(MCAO)手术,允许它们有4周恢复时间,接着随机分组:溶媒对照组(水)、 0.63 mg/kg达方吡啶组或2 mg/kg达方吡啶灌胃组,每天两次,一共三天。然后停药10天(洗脱期),依据双交叉研究设计重新分组。于治疗前、治疗中和洗脱期以前肢和后肢的摆放、身体摆动和圆筒试验进行感觉运动功能评估。采集血样来确认大鼠处于达方吡啶治疗期。

  在研究中,大脑中动脉闭塞造成感觉运动功能的严重急性缺损,只能部分恢复功能,所有动物在接受治疗前四周末达到严重功能缺损的平稳期。在中期治疗及总体来看,达方吡啶治疗显著改善大鼠的前肢、后肢和身体摆动功能。交叉统计模型证实,在统一偏倚的基础上,大剂量达方吡啶较溶媒组和小剂量组的改善效果显著(肢体摆放实验 P<0.0001,身体摆动实验P<0.001)。依据采用的统计模型,小剂量达方吡啶组较溶媒组或功能改善趋势更强,或已达到统计学意义。此外,治疗期的第二次评估得分显著高于治疗期的第一次评分。

  链接:

  International Stroke Conference

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    2012-04-04 xiongliangxl
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