Electrogenic N‐methyl‐D‐aspartate receptor signaling enhances binaural responses in the adult brainstem

Electrogenic N‐methyl‐D‐aspartate receptor signaling enhances binaural responses in the adult brainstem
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电化学 NâmethylâDâaspartate 受体信号传导增强成人脑干的双耳反应

DOI:
10.1111/ejn.13859
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发表时间:
2018
影响因子:
3.4
通讯作者:
Felmy F.
Felmy F.
中科院分区:
医学3区
文献类型:
--
作者:
Siveke I;Ammer J.J;Gleiss S.A;Grothe B;Leibold C;Felmy F.

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在感觉系统中,神经元对外界刺激的表征沿着感觉通路增强。在听觉系统中,双耳信息的强烈增强发生在脑干和中脑之间;然而,潜在的细胞机制尚不清楚。在这里,我们研究了双耳信息的转换在外侧丘系背核(DNLL),一个核,连接双耳核在脑干和下丘在中脑。我们在成年蒙古沙鼠的体外和在体电生理研究中发现,N-甲基-D-天冬氨酸受体(NMDARs)在DNLL的神经元编码刺激特性中起着关键作用。虽然NMDAR增加了放电率,但神经元反应的时间和准确性保持不变。NMDAR介导的兴奋增加了关于声刺激的信息。总之,我们的研究结果表明,在DNLL的NMDARs增强听觉信息含量在成年哺乳动物脑干。
In sensory systems, the neuronal representation of external stimuli is enhanced along the sensory pathway. In the auditory system, strong enhancement of binaural information takes place between the brainstem and the midbrain; however, the underlying cellular mechanisms are unknown. Here we investigated the transformation of binaural information in the dorsal nucleus of the lateral lemniscus (DNLL), a nucleus that connects the binaural nuclei in the brainstem and the inferior colliculus in the midbrain. We usedin vitroandin vivoelectrophysiology in adult Mongolian gerbils to show thatN‐methyl‐D‐aspartate receptor (NMDARs) play a critical role in neuronal encoding of stimulus properties in the DNLL. While NMDARs increase firing rates, the timing and the accuracy of the neuronal responses remain unchanged. NMDAR‐mediated excitation increases the information about the acoustic stimulus. Taken together, our results show that NMDARs in the DNLL enhance the auditory information content in adult mammal brainstem.
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