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Open Access 01-09-2017 | Original Article

Store-operated calcium entry is essential for glial calcium signalling in CNS white matter

Authors: M. Papanikolaou, A. Lewis, A. M. Butt

Published in: Brain Structure and Function | Issue 7/2017

Abstract

‘Calcium signalling’ is the ubiquitous response of glial cells to multiple extracellular stimuli. The primary mechanism of glial calcium signalling is by release of calcium from intracellular stores of the endoplasmic reticulum (ER). Replenishment of ER Ca²⁺ stores relies on store-operated calcium entry (SOCE). However, despite the importance of calcium signalling in glial cells, little is known about their mechanisms of SOCE. Here, we investigated SOCE in glia of the mouse optic nerve, a typical CNS white matter tract that comprises bundles of myelinated axons and the oligodendrocytes and astrocytes that support them. Using quantitative RT-PCR, we identified Orai1 channels, both Stim1 and Stim2, and the transient receptor potential M3 channel (TRPM3) as the primary channels for SOCE in the optic nerve, and their expression in both astrocytes and oligodendrocytes was demonstrated by immunolabelling of optic nerve sections and cultures. The functional importance of SOCE was demonstrated by fluo-4 calcium imaging on isolated intact optic nerves and optic nerve cultures. Removal of extracellular calcium ([Ca²⁺]_o) resulted in a marked depletion of glial cytosolic calcium ([Ca²⁺]_i), which recovered rapidly on restoration of [Ca²⁺]_o via SOCE. 2-aminoethoxydiphenylborane (2APB) significantly decreased SOCE and severely attenuated ATP-mediated calcium signalling. The results provide evidence that Orai/Stim and TRPM3 are important components of the ‘calcium toolkit’ that underpins SOCE and the sustainability of calcium signalling in white matter glia.

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Title: Store-operated calcium entry is essential for glial calcium signalling in CNS white matter
Authors: M. Papanikolaou
A. Lewis
A. M. Butt
Publication date: 01-09-2017
Publisher: Springer Berlin Heidelberg
Published in: Brain Structure and Function / Issue 7/2017
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-017-1380-8

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Store-operated calcium entry is essential for glial calcium signalling in CNS white matter

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