Silencing microRNA-134 produces neuroprotective and prolonged seizure-suppressive effects.

Silencing microRNA-134 produces neuroprotective and prolonged seizure-suppressive effects.
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DOI:
10.1038/nm.2834
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发表时间:
2012-07
期刊:
影响因子:
82.9
通讯作者:
Henshall, David C.
Henshall, David C.
中科院分区:
医学1区
文献类型:
--
作者:
Jimenez-Mateos, Eva M.;Engel, Tobias;Merino-Serrais, Paula;McKiernan, Ross C.;Tanaka, Katsuhiro;Mouri, Genshin;Sano, Takanori;O'Tuathaigh, Colm;Waddington, John L.;Prenter, Suzanne;Delanty, Norman;Farrell, Michael A.;O'Brien, Donncha F.;Conroy, Ronan M.;Stallings, Raymond L.;DeFelipe, Javier;Henshall, David C.

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颞叶癫痫是一种常见的慢性神经系统疾病,以反复自发性癫痫发作为特征。MicroRNAs(MiRNAs)是一种小的、非编码的RNAs,它调节蛋白质编码的mRNAs的转录后表达,这可能在神经疾病的发病机制中发挥重要作用。在长时间、损伤性癫痫发作的模型(癫痫持续状态)以及实验性和人类癫痫中,我们发现miR-134上调,这是一种大脑特异的、活性调节的miRNA,与树突棘的形态控制有关。使用antagomir在体内沉默miR-134的表达可将海马CA3区锥体神经元树突棘密度降低21%,并使小鼠对癫痫持续状态引起的癫痫发作和海马区损伤难以抵抗。癫痫持续状态后,miR-134的耗尽可减少90%以上的自发性癫痫的后期发生,并减轻伴随的颞叶癫痫的病理特征。因此,沉默miR-134可以发挥长期的癫痫抑制和神经保护作用;无论这些作用是抗惊厥作用还是真正的抗癫痫作用,都需要额外的实验。
Temporal lobe epilepsy is a common, chronic neurologic disorder characterized by recurrent spontaneous seizures. MicroRNAs (miRNAs) are small, non-coding RNAs that regulate post-transcriptional expression of protein-coding mRNAs, which may have important roles in the pathogenesis of neurologic disorders. In models of prolonged, injurious seizures (status epilepticus) and in experimental and human epilepsy, we found up-regulation of miR-134, a brain-specific, activity-regulated miRNA implicated in the control of dendritic spine morphology. Silencing of miR-134 expression in vivo using antagomirs reduced hippocampal CA3 pyramidal neuron dendrite spine density by 21%, and rendered mice refractory to seizures and hippocampal injury caused by status epilepticus. Depletion of miR-134 after status epilepticus reduced the later occurrence of spontaneous seizures by over 90% and mitigated attendant pathologic features of temporal lobe epilepsy. Thus, silencing miR-134 exerts prolonged seizure suppressant and neuroprotective actions; whether these represent anticonvulsant or truly antiepileptogenic effects requires additional experimentation.
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