Calcium imaging of auditory nerve fiber terminals in the cochlear nucleus.

Calcium imaging of auditory nerve fiber terminals in the cochlear nucleus.
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DOI:
10.1016/j.jneumeth.2010.11.008
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发表时间:
2011-01-30
影响因子:
3
通讯作者:
Xu-Friedman, Matthew A.
Xu-Friedman, Matthew A.
中科院分区:
医学4区
文献类型:
--
作者:
Chanda, Soham;Oh, Sangrok;Xu-Friedman, Matthew A.

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理解神经元计算的一个重要模型是听觉信息是如何在耳蜗核前腹侧核(AVCN)的丛状细胞(BCS)上的听神经(AN)纤维形成的突触中转换的。这种转化受突触可塑性的影响,其机制已初步从突触后电生理学的角度进行了研究。然而,对突触前终末进行直接测量也很重要,以考虑突触前机制。在这里,我们介绍了一种利用突触前AN终末的钙成像技术,通过将葡聚糖结合的荧光团注射到耳蜗处来实现这一点的技术。为了测量钙瞬变,我们使用了钙敏感的荧光团,并测量了刺激时荧光的变化。作为这项技术应用的一个例子,我们发现GABAB受体的激活减少了突触前钙内流。这项技术可以进一步扩展到研究活动和其他依赖神经调节剂的可塑性对AN终末的影响。
One important model for understanding neuronal computation is how auditory information is transformed at the synapses made by auditory nerve (AN) fibers on the bushy cells (BCs) in the anteroventral cochlear nucleus (AVCN). This transformation is influenced by synaptic plasticity, the mechanisms of which have been studied primarily using postsynaptic electrophysiology. However, it is also important to make direct measurements of the presynaptic terminal to consider presynaptic mechanisms. Here we introduce a technique for doing that using calcium imaging of presynaptic AN terminals, by injecting dextran-conjugated fluorophores into the cochlea. To measure the calcium transients, we used calcium-sensitive fluorophores, and measured the changes in fluorescence upon stimulation. As an example of the application of this technique, we showed that activation of GABAB receptors reduces presynaptic calcium influx. This technique could be further extended to study the effects of activity- and other neuromodulator-dependent plasticities on AN terminals.
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