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The trinity of Ca2+ sources for the exocytotic glutamate release from astrocytes.

Abstract：

:Astrocytes can exocytotically release the transmitter glutamate. Increased cytosolic Ca(2+) concentration is necessary and sufficient in this process. The source of Ca(2+) for the Ca(2+)-dependent exocytotic release of glutamate from astrocytes predominately comes from endoplasmic reticulum (ER) stores with contributions from both inositol 1,4,5-trisphosphate- and ryanodine/caffeine-sensitive stores. An additional source of Ca(2+) comes from the extracellular space via store-operated Ca(2+) entry due to the depletion of ER stores. Here transient receptor potential canonical type 1 containing channels permit entry of Ca(2+) to the cytosol, which can then be transported by the store-specific Ca(2+)-ATPase to (re)fill ER. Mitochondria can modulate cytosolic Ca(2+) levels by affecting two aspects of the cytosolic Ca(2+) kinetics in astrocytes. They play a role in immediate sequestration of Ca(2+) during the cytosolic Ca(2+) increase in stimulated astrocytes as a result of Ca(2+) entry into the cytosol from ER stores and/or extracellular space. As cytosolic Ca(2+)declines due to activity of pumps, such as the smooth ER Ca(2+)-ATPase, free Ca(2+) is slowly released by mitochondria into cytosol. Taken together, the trinity of Ca(2+) sources, ER, extracellular space and mitochondria, can vary concentration of cytosolic Ca(2+) which in turn can modulate Ca(2+)-dependent vesicular glutamate release from astrocytes. An understanding of how these Ca(2+) sources contribute to glutamate release in (patho)physiology of astrocytes will provide information on astrocytic functions in health and disease and may also open opportunities for medical intervention.

journal_name

Neurochem Int

journal_title

Neurochemistry international

authors

Reyes RC,Parpura V

doi

10.1016/j.neuint.2008.12.018

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

2-8

issue

1-3

eissn

0197-0186

issn

1872-9754

pii

S0197-0186(09)00004-7

journal_volume

55

pub_type

杂志文章,评审

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