Microglia trigger astrocyte-mediated neuroprotection via purinergic gliotransmission

Youichi Shinozaki, Masatoshi Nomura, Ken Iwatsuki, Yoshinori Moriyama, Christian Gachet, Schuichi Koizumi

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55 Citations (Scopus)

Abstract

Microglia are highly sensitive to even small changes in the brain environment, such as invasion of non-hazardous toxicants or the presymptomatic state of diseases. However, the physiological or pathophysiological consequences of their responses remain unknown. Here, we report that cultured microglia sense low concentrations of the neurotoxicant methylmercury (MeHglow) and provide neuroprotection against MeHg, for which astrocytes are also required. When exposed to MeHglow, microglia exocytosed ATP via p38 MAPK- and vesicular nucleotide transporter (VNUT)-dependent mechanisms. Astrocytes responded to the microglia-derived ATP via P2Y1 receptors and released interleukin-6 (IL-6), thereby protecting neurons against MeHglow. These neuroprotective actions were also observed in organotypic hippocampal slices from wild-type mice, but not in slices prepared from VNUT knockout or P2Y1 receptor knockout mice. These findings suggest that microglia sense and respond to even non-hazardous toxicants such as MeHglow and change their phenotype into a neuroprotective one, for which astrocytic support is required.

Original languageEnglish
Article number4329
JournalScientific reports
Volume4
DOIs
Publication statusPublished - Apr 1 2014

ASJC Scopus subject areas

  • General

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    Shinozaki, Y., Nomura, M., Iwatsuki, K., Moriyama, Y., Gachet, C., & Koizumi, S. (2014). Microglia trigger astrocyte-mediated neuroprotection via purinergic gliotransmission. Scientific reports, 4, [4329]. https://doi.org/10.1038/srep04329