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• W2052528904 abstract "Activity-dependent dendritic Ca 2+ signals play a critical role in multiple forms of nonlinear cellular output and plasticity. In thalamocortical neurons, despite the well established spatial separation of sensory and cortical inputs onto proximal and distal dendrites, respectively, little is known about the spatiotemporal dynamics of intrinsic dendritic Ca 2+ signaling during the different state-dependent firing patterns that are characteristic of these neurons. Here we demonstrate that T-type Ca 2+ channels are expressed throughout the entire dendritic tree of rat thalamocortical neurons and that they mediate regenerative propagation of low threshold spikes, typical of, but not exclusive to, sleep states, resulting in global dendritic Ca 2+ influx. In contrast, actively backpropagating action potentials, typical of wakefulness, result in smaller Ca 2+ influxes that can temporally summate to produce dendritic Ca 2+ accumulations that are linearly related to firing frequency but spatially confined to proximal dendritic regions. Furthermore, dendritic Ca 2+ transients evoked by both action potentials and low-threshold spikes are shaped by Ca 2+ uptake by sarcoplasmic/endoplasmic reticulum Ca 2+ ATPases but do not rely on Ca 2+ -induced Ca 2+ release. Our data demonstrate that thalamocortical neurons are endowed with intrinsic dendritic Ca 2+ signaling properties that are spatially and temporally modified in a behavioral state-dependent manner and suggest that backpropagating action potentials faithfully inform proximal sensory but not distal corticothalamic synapses of neuronal output, whereas corticothalamic synapses only “detect” Ca 2+ signals associated with low-threshold spikes." @default.
• W2052528904 created "2016-06-24" @default.
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• W2052528904 date "2010-11-03" @default.
• W2052528904 modified "2023-09-26" @default.
• W2052528904 title "State-Dependent Firing Determines Intrinsic Dendritic Ca²⁺Signaling in Thalamocortical Neurons" @default.
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• W2052528904 doi "https://doi.org/10.1523/jneurosci.2968-10.2010" @default.
• W2052528904 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3044870" @default.
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