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首页> 外文期刊>Neuron >Signaling microdomains define the specificity of receptor-mediated InsP(3) pathways in neurons.
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Signaling microdomains define the specificity of receptor-mediated InsP(3) pathways in neurons.

机译:信号微区定义神经元中受体介导的InsP(3)通路的特异性。

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摘要

M(1) muscarinic (M(1)AChRs) and B(2) bradykinin (B(2)Rs) receptors are two PLCbeta-coupled receptors that mobilize Ca(2+) in nonexcitable cells. In many neurons, however, B(2)Rs but not M(1)AChRs mobilize intracellular Ca(2+). We have studied the membrane organization and dynamics underlying this coupling specificity by using Trp channels as biosensors for real-time detection of PLCbeta products. We found that, in sympathetic neurons, although both receptors rapidly produced DAG and InsP(3) as messengers, only InsP(3) formed by B(2)Rs has the ability to activate IP(3)Rs. This exclusive coupling results from spatially restricted complexes linking B(2)Rs to IP(3)Rs, a missing partnership for M(1)AChRs. These complexes allow fast and localized rises of InsP(3), necessary to activate the low-affinity neuronal IP(3)R. Thus, these signaling microdomains are of critical importance for the induction of selective responses, discriminating proinflammatory information associated with B(2)Rs from cholinergic neurotransmission.
机译:M(1)毒蕈碱(M(1)AChRs)和B(2)缓激肽(B(2)Rs)受体是两个PLCbeta耦合受体,动员Ca(2+)在非兴奋性细胞中。在许多神经元,但是,B(2)Rs,但不是M(1)AChRs动员细胞内Ca(2+)。我们已经通过使用Trp通道作为生物传感器实时检测PLCbeta产品,研究了这种偶联特异性基础的膜组织和动力学。我们发现,在交感神经元中,尽管两个受体都迅速产生DAG和InsP(3)作为信使,但只有由B(2)Rs形成的InsP(3)才具有激活IP(3)Rs的能力。这种排他性耦合是由于将B(2)Rs链接到IP(3)Rs(M(1)AChRs缺少的伙伴关系)而受到空间受限的复合物的影响。这些复合物允许激活低亲和力神经元IP(3)R所需的InsP(3)快速和局部升高。因此,这些信号微域对于诱导选择性反应,区分与胆碱能神经传递与B(2)Rs相关的促炎信息至关重要。

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