Referenced in: none

Automatically associated channels: TRP , TRPA , TRPA1

Title: TRPA1 channels are regulators of astrocyte basal calcium levels and long-term potentiation via constitutive D-serine release.

Authors: Eiji Shigetomi, Olan Jackson-Weaver, Robert T Huckstepp, Thomas J O'Dell, Baljit S Khakh

Journal, date & volume: J. Neurosci., 2013 Jun 12 , 33, 10143-53

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/23761909

Abstract
Astrocytes are found throughout the brain where they make extensive contacts with neurons and synapses. Astrocytes are known to display intracellular Ca(2+) signals and release signaling molecules such as D-serine into the extracellular space. However, the role(s) of astrocyte Ca(2+) signals in hippocampal long-term potentiation (LTP), a form of synaptic plasticity involved in learning and memory, remains unclear. Here, we explored a recently discovered novel TRPA1 channel-mediated transmembrane Ca(2+) flux pathway in astrocytes. Specifically, we determined whether block or genetic deletion of TRPA1 channels affected LTP of Schaffer collateral to CA1 pyramidal neuron synapses. Using pharmacology, TRPA1(-/-) mice, imaging, electrophysiology, and D-serine biosensors, our data indicate that astrocyte TRPA1 channels contribute to basal Ca(2+) levels and are required for constitutive D-serine release into the extracellular space, which contributes to NMDA receptor-dependent LTP. The findings have broad relevance for the study of astrocyte-neuron interactions by demonstrating how TRPA1 channel-mediated fluxes contribute to astrocyte basal Ca(2+) levels and neuronal function via constitutive D-serine release.