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Author Notes:

Correspondence: Dr. Long-Jun Wu, Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Road, Piscataway, NJ 08854, TEL: (732) 445-2182; FAX: (732) 445-5870, lwu@dls.rutgers.edu.

P.S. and M.M. contributed equally.

We thank Dr. Michael Dailey (University of Iowa) for providing us with P2Y12 KO mice and Dr. David Atwell (University College London) for critical reading of the manuscript.

The authors declare no competing financial interests.

Subjects:

Research Funding:

This work is supported by National Institute of Health (R01NS088627, T32GM8339, T32ES007148), New Jersey Commission on Spinal Cord Research (CSCR15ERG015), National Natural Science Foundation of China (81271162), and Korean National Research Foundation grant (2012R1A3A2048834).

Keywords:

  • Science & Technology
  • Life Sciences & Biomedicine
  • Neurosciences
  • Neurosciences & Neurology
  • microglia
  • P2Y12 receptor
  • ATP
  • K+ channels
  • OPERATED CALCIUM-ENTRY
  • P2Y(12) RECEPTOR
  • IN-VIVO
  • ADENYLYL-CYCLASE
  • NEUROPATHIC PAIN
  • STATUS EPILEPTICUS
  • EXTRACELLULAR ATP
  • PROCESS EXTENSION
  • SPINAL MICROGLIA
  • BRAIN-SLICES

Activation of microglial P2Y12 receptor is required for outward potassium currents in response to neuronal injury

Tools:

Journal Title:

Neuroscience

Volume:

Volume 318

Publisher:

, Pages 22-33

Type of Work:

Article | Post-print: After Peer Review

Abstract:

Microglia, the resident immune cells in the central nervous system (CNS), constantly survey the surrounding neural parenchyma and promptly respond to brain injury. Activation of purinergic receptors such as P2Y12 receptors (P2Y12R) in microglia has been implicated in chemotaxis toward ATP that is released by injured neurons and astrocytes. Activation of microglial P2Y12R elicits outward potassium current that is associated with microglial chemotaxis in response to injury. This study aimed at investigating the identity of the potassium channel implicated in microglial P2Y12R-mediated chemotaxis following neuronal injury and understanding the purinergic signaling pathway coupled to the channel. Using a combination of two-photon imaging, electrophysiology and genetic tools, we found the ATP-induced outward current to be largely dependent on P2Y12R activation and mediated by G-proteins. Similarly, P2Y12R-coupled outward current was also evoked in response to laser-induced single neuron injury. This current was abolished in microglia obtained from mice lacking P2Y12R. Dissecting the properties of the P2Y12R-mediated current using a pharmacological approach revealed that both the ATP and neuronal injury-induced outward current in microglia was sensitive to quinine (1 mM) and bupivacaine (400 μM), but not tetraethylammonium (TEA) (10 mM) and 4-aminopyridine (4-AP) (5 mM). These results suggest that the quinine/bupivacaine-sensitive potassium channels are the functional effectors of the P2Y12R-mediated signaling in microglia activation following neuronal injury.

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© 2016 IBRO.

This is an Open Access work distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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