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首页> 外文期刊>Neuron >The TRPM7 ion channel functions in cholinergic synaptic vesicles and affects transmitter release.
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The TRPM7 ion channel functions in cholinergic synaptic vesicles and affects transmitter release.

机译:TRPM7离子通道在胆碱能突触小泡中起作用并影响变送器的释放。

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摘要

A longstanding hypothesis is that ion channels are present in the membranes of synaptic vesicles and might affect neurotransmitter release. Here we demonstrate that TRPM7, a member of the transient receptor potential (TRP) ion channel family, resides in the membrane of synaptic vesicles of sympathetic neurons, forms molecular complexes with the synaptic vesicle proteins synapsin I and synaptotagmin I, and directly interacts with synaptic vesicular snapin. In sympathetic neurons, changes in TRPM7 levels and channel activity alter acetylcholine release, as measured by EPSP amplitudes and decay times in postsynaptic neurons. TRPM7 affects EPSP quantal size, an intrinsic property of synaptic vesicle release. Targeted peptide interference of TRPM7's interaction with snapin affects the amplitudes and kinetics of postsynaptic EPSPs. Thus, vesicular TRPM7 channel activity is critical to neurotransmitter release in sympathetic neurons.
机译:一个长期的假设是,离子通道存在于突触小泡的膜中,并可能影响神经递质的释放。在这里,我们证明TRPM7是瞬时受体电位(TRP)离子通道家族的成员,位于交感神经元的突触小泡膜中,与突触小泡蛋白synapsin I和synaptotagmin I形成分子复合物,并直接与突触相互作用水泡Snapin。在交感神经元中,TRPS7水平和通道活性的变化会改变乙酰胆碱的释放,这通过突触后神经元的EPSP幅度和衰减时间来衡量。 TRPM7影响EPSP的数量大小,突触小泡释放的内在属性。 TRPM7与snapin相互作用的靶向肽干扰会影响突触后EPSP的幅度和动力学。因此,囊泡TRPM7通道活性对于交感神经元中神经递质的释放至关重要。

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