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Título: | ATP-P2X7 Receptor Modulates Axon Initial Segment Composition and Function in Physiological Conditions and Brain Injury |
Autor: | Puerto, Ana del CSIC; Fronzaroli-Molinieres, Laure; Pérez-Álvarez, María José CSIC ORCID; Giraud, Pierre; Carlier, Edmond; Wandosell, Francisco CSIC ORCID ; Debanne, Dominique; Garrido Jurado, Juan José CSIC ORCID | Palabras clave: | BBG Sodium channels P2X7 receptor Brain ischemia Axon initial segment Ankyrin G |
Fecha de publicación: | 2015 | Editor: | Oxford University Press | Citación: | Cerebral Cortex 25: 2282- 2294 (2015) | Resumen: | © 2014 The Author. All rights reserved. Axon properties, including action potential initiation and modulation, depend on both AIS integrity and the regulation of ion channel expression in the AIS. Alteration of the axon initial segment (AIS) has been implicated in neurodegenerative, psychiatric, and brain trauma diseases, thus identification of the physiological mechanisms that regulate the AIS is required to understand and circumvent AIS alterations in pathological conditions. Here, we show that the purinergic P2X7 receptor and its agonist, adenosine triphosphate (ATP), modulate both structural proteins and ion channel density at the AIS in cultured neurons and brain slices. In cultured hippocampal neurons, an increment of extracellular ATP concentration or P2X7-green fluorescent protein (GFP) expression reduced the density of ankyrin G and voltage-gated sodium channels at the AIS. This effect is mediated by P2X7-regulated calcium influx and calpain activation, and impaired by P2X7 inhibition with Brilliant Blue G (BBG), or P2X7 suppression. Electrophysiological studies in brain slices showed that P2X7-GFP transfection decreased both sodium current amplitude and intrinsic neuronal excitability, while P2X7 inhibition had the opposite effect. Finally, inhibition of P2X7 with BBG prevented AIS disruption after ischemia/reperfusion in rats. In conclusion, our study demonstrates an involvement of P2X7 receptors in the regulation of AIS mediated neuronal excitability in physiological and pathological conditions. | URI: | http://hdl.handle.net/10261/133279 | DOI: | 10.1093/cercor/bhu035 | Identificadores: | doi: 10.1093/cercor/bhu035 issn: 1460-2199 |
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