Astrocyte calcium waves propagate proximally by gap junction and distally by extracellular diffusion of ATP released from volume-regulated anion channels
Abstract
Wave-like propagation of [Ca2+](i) increases is a remarkable intercellular communication characteristic in astrocyte networks, intercalating neural circuits and vasculature. Mechanically-induced [Ca2+](i) increases and their subsequent propagation to neighboring astrocytes in culture is a classical model of astrocyte calcium wave and is known to be mediated by gap junction and extracellular ATP, but the role of each pathway remains unclear. Pharmacologic analysis of time-dependent distribution of [Ca2+](i)revealed three distinct [Ca2+](i) increases, the largest being in stimulated cells independent of extracellular Ca2+ and inositol 1,4,5-trisphosphate-induced Ca2+ release. In addition, persistent [Ca2+](i) increases were found to propagate rapidly via gap junctions in the proximal region, and transient [Ca2+](i) increases were found to propagate slowly via extracellular ATP in the distal region. Simultaneous imaging of astrocyte [Ca2+](i) and extracellular ATP, the latter of which was measured by an ATP sniffing cell, revealed that ATP was released within the proximal region by volume-regulated anion channel in a [Ca2+](i) independent manner. This detailed analysis of a classical model is the first to address the different contributions of two major pathways of calcium waves, gap junctions and extracellular ATP.
Journal
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- Scientific Reports
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Scientific Reports 7 13115-13115, 2017-10-13
Nature Publishing Group
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Keywords
Details 詳細情報について
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- CRID
- 1050575520346950912
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- NII Article ID
- 120006358588
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- ISSN
- 20452322
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- HANDLE
- 20.500.14094/90004270
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- Crossref
- CiNii Articles
- KAKEN