ArticleThe Journal of neuroscience : the official journal of the Society for Neuroscience1996
Determinants of the time course of facilitation at the granule cell to Purkinje cell synapse.
Article in The Journal of neuroscience : the official journal of the Society for Neuroscience, 1996. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 190 papers.
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Who cites it
190 citing papers in PubMed.
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- Article
130 more citing papers are in PubMed but not listed here.
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Authors and funding
2 authors.
Funding
Abstract
Short-term facilitation is a widely observed form of synaptic enhancement that is not well understood. Although presynaptic calcium has long been implicated in this process, its role is unclear, particularly at synapses in the mammalian brain. We tested the role of presynaptic residual free calcium ([Ca]res) in facilitation of synapses between granule cells and Purkinje cells in rat cerebellar slices. Paired-pulse facilitation of synaptic currents resulted in an approximately 2.5-fold enhancement that decayed with a time constant of approximately 200 msec, as assessed by voltage-clamp recordings. Measurements of [Ca]res using fluorescent calcium-sensitive indicators revealed that [Ca]res decayed more rapidly than did facilitation. Manipulation of [Ca]res dynamics by introducing EGTA into presynaptic terminals sped the decays of [Ca]res and facilitation in a dose-dependent manner. When [Ca]res was reduced to a brief impulse lasting several milliseconds, facilitation was still present, although reduced in amplitude and duration. Facilitation decayed with an intrinsic time constant of approximately 40 msec. These results suggest that facilitation at this synapse is produced by a calcium-driven process with a high affinity and a slow effective off-rate. A combination of [Ca]res dynamics and the properties of a calcium-driven reaction determine the time course and amplitude of facilitation.
Indexed as
Identifiers
8795622PMC6578977What OpenQuestion holds
Registered trials
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