eprintid: 1506176
rev_number: 25
eprint_status: archive
userid: 608
dir: disk0/01/50/61/76
datestamp: 2016-07-30 21:02:27
lastmod: 2021-09-19 22:53:20
status_changed: 2016-09-23 13:35:33
type: article
metadata_visibility: show
creators_name: Pigott, BM
creators_name: Garthwaite, J
title: Nitric Oxide Is Required for L-Type Ca(2+) Channel-Dependent Long-Term Potentiation in the Hippocampus.
ispublished: pub
divisions: UCL
divisions: B02
divisions: C10
divisions: D17
divisions: G95
keywords: L-type Ca2+ channel, LTP, NMDA receptor, cGMP, hippocampus, nitric oxide, synaptic plasticity
note: Copyright © 2016 Pigott and Garthwaite. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
abstract: Nitric oxide (NO) has long been implicated in the generation of long-term potentiation (LTP) and other types of synaptic plasticity, a role for which the intimate coupling between NMDA receptors (NMDARs) and the neuronal isoform of NO synthase (nNOS) is likely to be instrumental in many instances. While several types of synaptic plasticity depend on NMDARs, others do not, an example of which is LTP triggered by opening of L-type voltage-gated Ca(2+) channels (L-VGCCs) in postsynaptic neurons. In CA3-CA1 synapses in the hippocampus, NMDAR-dependent LTP (LTPNMDAR) appears to be primarily expressed postsynaptically whereas L-VGCC-dependent LTP (LTPL-VGCC), which often coexists with LTPNMDAR, appears mainly to reflect enhanced presynaptic transmitter release. Since NO is an excellent candidate as a retrograde messenger mediating post-to-presynaptic signaling, we sought to determine if NO functions in LTPL-VGCC in mouse CA3-CA1 synapses. When elicited by a burst type of stimulation with NMDARs and the associated NO release blocked, LTPL-VGCC was curtailed by inhibition of NO synthase or of the NO-receptor guanylyl cyclase to the same extent as occurred with inhibition of L-VGCCs. Unlike LTPNMDAR at these synapses, LTPL-VGCC was unaffected in mice lacking endothelial NO synthase, implying that the major source of the NO is neuronal. Transient delivery of exogenous NO paired with tetanic synaptic stimulation under conditions of NMDAR blockade resulted in a long-lasting potentiation that was sensitive to inhibition of NO-receptor guanylyl cyclase but was unaffected by inhibition of L-VGCCs. The results indicate that NO, acting through its second messenger cGMP, plays an unexpectedly important role in L-VGCC-dependent, NMDAR-independent LTP, possibly as a retrograde messenger generated in response to opening of postsynaptic L-VGCCs and/or as a signal acting postsynaptically, perhaps to facilitate changes in gene expression.
date: 2016-06-29
date_type: published
official_url: http://dx.doi.org/10.3389/fnsyn.2016.00017
oa_status: green
full_text_type: pub
pmcid: PMC4925670
language: eng
primo: open
primo_central: open_green
article_type_text: Journal Article
verified: verified_manual
elements_id: 1144671
doi: 10.3389/fnsyn.2016.00017
language_elements: eng
lyricists_name: Garthwaite, John
lyricists_id: JGART99
full_text_status: public
publication: Front Synaptic Neurosci
volume: 8
article_number: 17
event_location: Switzerland
issn: 1663-3563
citation:        Pigott, BM;    Garthwaite, J;      (2016)    Nitric Oxide Is Required for L-Type Ca(2+) Channel-Dependent Long-Term Potentiation in the Hippocampus.                   Front Synaptic Neurosci , 8     , Article 17.  10.3389/fnsyn.2016.00017 <https://doi.org/10.3389/fnsyn.2016.00017>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1506176/1/fnsyn-08-00017.pdf