Microglia release ATP by exocytosis.

Abstract:

:Microglia survey the brain environment by sensing several types of diffusible molecules, among which extracellular nucleotides released/leaked from damaged cells have central roles. Microglia sense ATP or other nucleotides by multiple P2 receptors, after which they change into several different phenotypes. However, so far, it is largely unknown whether microglia themselves release ATP and, if so, by what mechanism. Here we show that exocytosis is the mechanism by which microglia release ATP. When we stimulated microglia with ionomycin, they released ATP and the release was dependent on Ca²⁺, vesicular H⁺-ATPase, or SNAREs but independent of connexin/pannexin hemichannels. VNUT was found to be expressed in microglia and exhibited no colocalization with lysosome. We also visualized the exocytosis of ATP by a quinacrine-based fluorescent time-lapse imaging. Moreover, we found that lipopolysaccharide increased the ionomycin-induced release of ATP, which was dependent on the increase in VNUT. Taken together, our data suggested that exocytosis is the mechanism of ATP release from microglia. When activated, they would release ATP by increasing VNUT-dependent exocytotic mechanisms.

journal_name

Glia

journal_title

Glia

authors

Imura Y,Morizawa Y,Komatsu R,Shibata K,Shinozaki Y,Kasai H,Moriishi K,Moriyama Y,Koizumi S

doi

10.1002/glia.22517

subject

Has Abstract

pub_date

2013-08-01 00:00:00

pages

1320-30

issue

8

eissn

0894-1491

issn

1098-1136

journal_volume

61

pub_type

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