Local CRH signaling promotes synaptogenesis and circuit integration of adult-born neurons.

Local CRH signaling promotes synaptogenesis and circuit integration of adult-born neurons.
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DOI:
10.1016/j.devcel.2014.07.001
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发表时间:
2014-09-29
期刊:
影响因子:
11.8
通讯作者:
Arenkiel BR
Arenkiel BR
中科院分区:
生物学1区
文献类型:
--
作者:
Garcia I;Quast KB;Huang L;Herman AM;Selever J;Deussing JM;Justice NJ;Arenkiel BR

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神经活动增强或损害神经元的从头突触发生和回路整合,但这种活动如何在成人大脑中机械地传递,在很大程度上是未知的。表达神经肽的中间神经元广泛分布于整个大脑中,并且是通过不同于经典神经传递的神经调节通路向下游传递神经活动的关键候选者。与识别信号传导机制的目标,神经元电路集成在成年人的大脑,我们已经病毒追踪本地促肾上腺皮质激素释放激素(CRH)表达抑制性中间神经元与广泛的突触前输入到新的神经元,不断整合到成年啮齿动物嗅球。成人出生的神经元上的局部CRH信号促进和/或稳定嗅球中的化学突触,揭示了成人大脑中持续回路可塑性、突触形成和新神经元整合的神经调节机制。
Neural activity either enhances or impairs de novo synaptogenesis and circuit integration of neurons, but how this activity is mechanistically relayed in the adult brain is largely unknown. Neuropeptide-expressing interneurons are widespread throughout the brain and are key candidates for conveying neural activity downstream via neuromodulatory pathways that are distinct from classical neurotransmission. With the goal of identifying signaling mechanisms that underlie neuronal circuit integration in the adult brain, we have virally traced local Corticotropin-releasing hormone (CRH)-expressing inhibitory interneurons with extensive presynaptic inputs onto new neurons that are continuously integrated into the adult rodent olfactory bulb. Local CRH signaling onto adult-born neurons promotes and/or stabilizes chemical synapses in the olfactory bulb, revealing a neuromodulatory mechanism for continued circuit plasticity, synapse formation, and integration of new neurons in the adult brain.
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