An Inconvenient Truth: Calcium Sensors Are Calcium Buffers.

An Inconvenient Truth: Calcium Sensors Are Calcium Buffers.
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DOI:
10.1016/j.tins.2018.09.005
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发表时间:
2018-12
影响因子:
15.9
通讯作者:
Jackson MB
Jackson MB
中科院分区:
医学1区
文献类型:
--
作者:
McMahon SM;Jackson MB

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Ca2+成像的最新进展为神经科学家提供了一种工具,可以在动物大脑体内同时跟踪大量单个神经元的活动,因为它们受到感官刺激、对环境挑战做出反应并参与行为。用于将细胞 Ca2+ 变化转化为荧光变化的 Ca2+ 传感器必须与 Ca2+ 结合才能产生信号。通过结合 Ca2+,这些传感器可以充当缓冲器,通常可以将 Ca2+ 变化的幅度降低几倍,并按比例减慢变化速率。因此,Ca2+ 探针可以扭曲其旨在研究的活动模式并修改正在进行的 Ca2+ 信号传导功能。认识到这些因素将增强体内 Ca2+ 成像在神经回路功能研究中的应用。
Recent advances in Ca2+ imaging have given neuroscientists a tool to follow the activity of large numbers of individual neurons simultaneously in vivo in the brains of animals as they are presented with sensory stimulation, respond to environmental challenges, and engage in behaviors. The Ca2+ sensors used to transduce changes in cellular Ca2+ into changes in fluorescence must bind Ca2+ to produce a signal. By binding Ca2+, these sensors can act as buffers, often reducing the magnitude of a Ca2+ change several fold and producing a proportional slowing of the rates of change. Ca2+ probes can thus distort the patterns of activity they are intended to study and modify ongoing Ca2+ signaling functions. Recognizing these factors will enhance the use of in vivo Ca2+ imaging in the investigation of neural circuit function.
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