Sensory-driven enhancement of calcium signals in individual Purkinje cell dendrites of awake mice.

Sensory-driven enhancement of calcium signals in individual Purkinje cell dendrites of awake mice.
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DOI:
10.1016/j.celrep.2014.02.001
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发表时间:
2014-03-13
期刊:
影响因子:
8.8
通讯作者:
Medina JF
Medina JF
中科院分区:
生物学1区
文献类型:
--
作者:
Najafi F;Giovannucci A;Wang SS;Medina JF

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攀爬纤维(CFs)通过触发突触后浦肯野细胞(PC)树突状细胞内大量钙离子的大量涌入,发出意外感觉事件发生的信号,从而促进小脑的可塑性和学习。然而,无论事件是否发生,CFS每秒都会发出一次信号,这引发了一个问题,即如何将感官驱动的信号与正在进行的自发活动的背景区分开来。在这里,我们报告了在清醒小鼠的PC树突中,当触发器是感觉事件时,CF触发的钙信号增强。此外,我们还发现,在每个PC树突状细胞中,总增强的很大一部分可以由非CF输入的感觉激活所提供的额外的钙促进来解释。我们认为,感觉刺激可能通过调节PC内的树突电压和钙离子浓度来增加小脑学习过程中可塑性信号的强度。
Climbing fibers (CFs) are thought to contribute to cerebellar plasticity and learning by triggering a large influx of dendritic calcium in the postsynaptic Purkinje cell (PC) to signal the occurrence of an unexpected sensory event. However, CFs fire about once per second whether or not an event occurs, raising the question of how sensory-driven signals might be distinguished from a background of ongoing spontaneous activity. Here, we report that in PC dendrites of awake mice, CF-triggered calcium signals are enhanced when the trigger is a sensory event. In addition, we show that a large fraction of the total enhancement in each PC dendrite can be accounted for by an additional boost of calcium provided by sensory activation of a non-CF input. We suggest that sensory stimulation may modulate dendritic voltage and calcium concentration in PCs to increase the strength of plasticity signals during cerebellar learning.
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