Regulation by astrocytic ATP of synaptic transmission

Schuichi Koizumi, Kazuhide Inoue

研究成果: Contribution to journalReview article査読

6 被引用数 (Scopus)

抄録

Originally ascribed to having only passive roles in the CNS, astrocytes are now known to have an active role in the regulation of synaptic transmission. Neuronal activity can evoke Ca2+ transients in astrocytes and Ca 2+ transients in astrocytes can evoke changes in neuronal activity. The excitatory neurotransmitter glutamate has been shown to mediate such bi-directional communication between astrocytes and neurons. We demonstrate here that ATP, a primary mediator of intercellular Ca2+ signaling among astrocytes, also mediates intercellular signaling between astrocytes and neurons in hippocampal cultures. Mechanical stimulation of astrocytes evoked Ca 2+ waves mediated by the release of ATP and activation of P2 receptors. Mechanically evoked Ca2+ waves led to decreased excitatory glutamatergic synaptic transmission in an ATP-dependent manner. Exogenous application of ATP does not affect post-synaptic glutamatergic responses but decreased pre-synaptic exocytotic events. Finally, we show that astrocytes exhibit spontaneous Ca2+ oscillations mediated by extracellular ATP and that inhibition of these Ca2+ responses enhanced excitatory glutamatergic transmission. We therefore conclude that ATP released from astrocytes exerts tonic and activity-dependent down-regulation of synaptic transmission via pre-synaptic mechanisms.

本文言語英語
ページ(範囲)389-396
ページ数8
ジャーナルFolia Pharmacologica Japonica
123
6
DOI
出版ステータス出版済み - 2004
外部発表はい

All Science Journal Classification (ASJC) codes

  • 薬理学

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