Neurology:P糖蛋白的功能变化与癫痫手术效果相关

2014-10-16 kimfrost 丁香园

大约有30%的癫痫患者不能通过药物治疗完全控制癫痫发作。虽然接受切除颞叶前部和内侧部结构的外科手术治疗的患者可能有60-75%出现令人满意的结局,但是长期来看只有约50%的患者能达到完全无发作,多数手术后患者仍然需要服用药物治疗。因此,找到能预测癫痫手术结局的生物标志物,成了临床上令人高度关注的一点。 根据药物抵抗可能机制中的转运体假说,多药外排性转运体(multidrug efflux

大约有30%的癫痫患者不能通过药物治疗完全控制癫痫发作。虽然接受切除颞叶前部和内侧部结构的外科手术治疗的患者可能有60-75%出现令人满意的结局,但是长期来看只有约50%的患者能达到完全无发作,多数手术后患者仍然需要服用药物治疗。因此,找到能预测癫痫手术结局的生物标志物,成了临床上令人高度关注的一点。

根据药物抵抗可能机制中的转运体假说,多药外排性转运体(multidrug efflux transporters)如P糖蛋白(P-Glycoprotein,Pgp)在局部的过度激活,阻碍了抗痫药物进入其脑内靶点的过程,致使药物无效。有一些对动物癫痫模型的研究结果支持这一假说,但是缺乏在人体内的相关资料。

在近期出版的Neurology杂志上,一个奥地利和英国联合研究团队发表了一项在人体内的相关研究。该研究使用放射性同位素标记的Pgp底物(R)-[11C]维拉帕米(VPM)进行PET检查,可非侵入性地测量大脑内Pgp的功能。本研究使用VPM-PET分别在颞叶癫痫手术之前和之后对患者进行检查,拟明确术后发作次数和抗癫痫药使用情况的改变是否与Pgp功能的改变相关。

研究共纳入了7名药物抵抗性颞叶癫痫患者,术后随访时间中位数为6年(4-7年)。对手术切除的海马样本也进行了免疫组化检查以确定其中的Pgp免疫活性。

该研究将最佳手术结局定义为“无痫性发作且能停用抗癫痫药物”。与非最佳手术结局相比,最佳手术结局的相关因素有:术前颞叶Pgp功能升高、所切除海马样本中Pgp阳性染色增高、以及术后全脑范围Pgp功能减低。

该研究显示Pgp的过度激活情况是动态变化的;而术后痫性发作完全控制和抗痫药物撤药与这种过度激活的逆转相关。但本研究只是一项初步性研究(pilot study),结论需要大规模队列研究加以进一步证实。


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    2015-09-28 mellisa1143

    非常好的信息,能够预测术后结局

    0

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    2015-01-11 yinhl1978
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    2015-04-10 lsj628
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