State-dependent calcium signaling in dendritic spines of striatal medium spiny neurons

Adam Carter, Bernardo L. Sabatini

Research output: Contribution to journalArticle

Abstract

Striatal medium spiny neurons (MSNs) in vivo undergo large membrane depolarizations known as state transitions. Calcium (Ca) entry into MSNs triggers diverse downstream cellular processes. However, little is known about Ca signals in MSN dendrites and spines and how state transitions influence these signals. Here, we develop a novel approach, combining 2-photon Ca imaging and 2-photon glutamate uncaging, to examine how voltage-sensitive Ca channels (VSCCs) and ionotropic glutamate receptors contribute to Ca signals in MSNs. We find that upstate transitions switch the VSCCs available in dendrites and spines, decreasing T-type while enhancing L-type channels. Moreover, these transitions change the dominant synaptic Ca source from Ca-permeable AMPA receptors to NMDA receptors. Finally, pairing bAPs with synaptic inputs generates additional synaptic Ca signals due to enhanced Ca influx through NMDA receptors. By altering the sources, amplitude, and kinetics of spine Ca signals, state transitions may gate synaptic plasticity and gene expression in MSNs.

Original languageEnglish (US)
Pages (from-to)483-493
Number of pages11
JournalNeuron
Volume44
Issue number3
DOIs
StatePublished - Oct 28 2004

Fingerprint

Corpus Striatum
Dendritic Spines
Calcium Signaling
Calcium
Neurons
Spine
Dendrites
N-Methyl-D-Aspartate Receptors
Photons
Ionotropic Glutamate Receptors
Neuronal Plasticity
AMPA Receptors
Calcium Channels
Glutamic Acid
Gene Expression
Membranes

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

State-dependent calcium signaling in dendritic spines of striatal medium spiny neurons. / Carter, Adam; Sabatini, Bernardo L.

In: Neuron, Vol. 44, No. 3, 28.10.2004, p. 483-493.

Research output: Contribution to journalArticle

Carter, Adam ; Sabatini, Bernardo L. / State-dependent calcium signaling in dendritic spines of striatal medium spiny neurons. In: Neuron. 2004 ; Vol. 44, No. 3. pp. 483-493.
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