Acid -sensing ion channel 1a is required for mGlu receptor dependent long-term depression in the hippocampus

D. Mango, E. Braksator, G. Battaglia, S. Marcelli, N. B. Mercuri, M. Feligioni, F. Nicoletti, Z. I. Bashir, R. Nistico

Research output: Contribution to journalArticlepeer-review

Abstract

Acid-sensing ion channels (ASICs), members of the degenerin/epithelial Na+ channel superfamily, are widely distributed in the mammalian nervous system. ASIC1 a is highly permeable to Ca2+ and are thought to be important in a variety of physiological processes, including synaptic plasticity, learning and memory. To further understand the role of ASIC1a in synaptic transmission and plasticity, we investigated metabotropic glutamate (mGlu) receptor-dependent long-term depression (LTD) in the hippocampus. We found that ASIC1a channels mediate a component of LTD in P30-40 animals, since the ASIC1a selective blocker psalmotoxin-1 (PcTx1) reduced the magnitude of LTD induced by application of the group I mGlu receptor agonist (S)-3,5-Dihydroxyphenylglycine (DHPG) or induced by paired-pulse low frequency stimulation (PP-LFS). Conversely, PcTx1 did not affect LTD in P13-18 animals. We also provide evidence that ASIC1a is involved in group I mGlu receptor-induced increase in action potential firing. However, blockade of ASIC1a did not affect DHPG-induced polyphosphoinositide hydrolysis, suggesting the involvement of some other molecular partners in the functional crosstalk between ASIC1a and group I mGlu receptors. Notably, PcTx1 was able to prevent the increase in GluA1 5845 phosphorylation at the post-synaptic membrane induced by group I mGlu receptor activation. These findings suggest a novel function of ASIC1 a channels in the regulation of group I mGlu receptor synaptic plasticity and intrinsic excitability. (C) 2017 Elsevier Ltd. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)12-19
Number of pages8
JournalPharmacological Research
Volume119
DOIs
Publication statusPublished - Mar 1 2017

Keywords

  • ASIC
  • Hippocampus
  • Electrophysiology
  • LTD
  • mGlu receptors

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