In the nervous system, extracellular ATP levels transiently increase in physiological and pathophysiological circumstances, effecting key signalling pathways in plasticity and inflammation through purinergic receptors. Pannexin 1 (Panx1) forms ion- and metabolite-permeable channels that mediate ATP release and are particularly enriched in the nervous system. Our recent study demonstrated that elevation of extracellular ATP triggers Panx1 internalization in a concentration- and time-dependent manner. Notably, this effect was sensitive to inhibition of ionotropic P2X7 purinergic receptors (P2X7Rs). Here, we report our novel findings from the detailed investigation of the mechanism underlying P2X7R–Panx1 cross-talk in ATP-stimulated internalization. We demonstrate that extracellular ATP triggers and is required for the clustering of P2X7Rs and Panx1 on Neuro2a cells through an extracellular physical interaction with the Panx1 first extracellular loop (EL1). Importantly, disruption of P2X7R–Panx1 clustering by mutation of tryptophan 74 within the Panx1 EL1 inhibits Panx1 internalization. Notably, P2X7R–Panx1 clustering and internalization are independent of P2X7R-associated intracellular signalling pathways (Ca2+ influx and Src activation). Further analysis revealed that cholesterol is required for ATP-stimulated P2X7R–Panx1 clustering at the cell periphery. Taken together, our data suggest that extracellular ATP induces and is required for Panx1 EL1-mediated, cholesterol-dependent P2X7R–Panx1 clustering and endocytosis. These findings have important implications for understanding the role of Panx1 in the nervous system and provide important new insights into Panx1–P2X7R cross-talk.
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July 2017
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The model of amorpha-4,11-diene synthase at the background of Artemisia annua plant, and several key sesquiterpene products generated by our mutation to demonstrate how cyclization processes catalyzed by amorpha-4,11-diene synthase. For more information, please see article by Xiao-Ya Chen et al., pages 2191–2202.
Research Article|
June 13 2017
P2X7 receptor cross-talk regulates ATP-induced pannexin 1 internalization
Andrew K.J. Boyce;
Andrew K.J. Boyce
1Division of Medical Sciences and Island Medical Program, University of Victoria, Victoria V8P 5C2, Canada
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Leigh Anne Swayne
1Division of Medical Sciences and Island Medical Program, University of Victoria, Victoria V8P 5C2, Canada
2Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver V6T 1Z3, Canada
Correspondence: Leigh Anne Swayne (lswayne@uvic.ca)
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Publisher: Portland Press Ltd
Received:
April 05 2017
Revision Received:
May 04 2017
Accepted:
May 10 2017
Accepted Manuscript online:
May 11 2017
Online ISSN: 1470-8728
Print ISSN: 0264-6021
© 2017 The Author(s); published by Portland Press Limited on behalf of the Biochemical Society
2017
Biochem J (2017) 474 (13): 2133–2144.
Article history
Received:
April 05 2017
Revision Received:
May 04 2017
Accepted:
May 10 2017
Accepted Manuscript online:
May 11 2017
Citation
Andrew K.J. Boyce, Leigh Anne Swayne; P2X7 receptor cross-talk regulates ATP-induced pannexin 1 internalization. Biochem J 1 July 2017; 474 (13): 2133–2144. doi: https://doi.org/10.1042/BCJ20170257
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