当前位置： SCI文献检索 > NEUROSCIENCE期刊下所有文献 > A subnanomolar concentration of Pituitary Adenylate Cyclase-Activating Polypeptide (PACAP) pre-synaptically modulates glutamatergic transmission in the rat hippocampus acting through acetylcholine.

A subnanomolar concentration of Pituitary Adenylate Cyclase-Activating Polypeptide (PACAP) pre-synaptically modulates glutamatergic transmission in the rat hippocampus acting through acetylcholine.

Abstract：

:The neuropeptide PACAP modulates synaptic transmission in the hippocampus exerting multiple effects through different receptor subtypes: the underlying mechanisms have not yet been completely elucidated. The neurotransmitter acetylcholine (ACh) also exerts a well-documented modulation of hippocampal synaptic transmission and plasticity. Since PACAP was shown to stimulate ACh release in the hippocampus, we tested whether PACAP acting through ACh might indirectly modulate glutamate-mediated synaptic transmission at a pre- and/or at a post-synaptic level. Using patch clamp on rat hippocampal slices, we tested PACAP effects on stimulation-evoked AMPA receptor-mediated excitatory post-synaptic currents (EPSCsAMPA) in the CA3-CA1 synapse and on spontaneous miniature EPSCs (mEPSCs) in CA1 pyramidal neurons. A subnanomolar dose of PACAP (0.5nM) decreased EPSCsAMPA amplitude, enhanced EPSC paired-pulse facilitation (PPF) and reduced mEPSC frequency, indicating a pre-synaptic decrease of glutamate release probability: these effects were abolished by simultaneous blockade of muscarinic and nicotinic ACh receptors, indicating the involvement of endogenous ACh. The effect of subnanomolar PACAP was abolished by a PAC1 receptor antagonist but not by a VPAC receptor blocker. At a higher concentration (10nM), PACAP inhibited EPSCsAMPA: this effect persisted in the presence of ACh receptor antagonists and did not involve any change in PPF or in mEPSC frequency, thus was not mediated by ACh and was exerted post- synaptically on CA1 pyramidal neurons. We suggest that a high-affinity PAC1 receptor pre-synaptically modulates hippocampal glutamatergic transmission acting through ACh. Therefore, administration of PACAP at very low doses might be envisaged in cognitive diseases with reduced cholinergic transmission.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Pecoraro V,Sardone LM,Chisari M,Licata F,Li Volsi G,Perciavalle V,Ciranna L,Costa L

doi

10.1016/j.neuroscience.2016.10.061

subject

Has Abstract

pub_date

2017-01-06 00:00:00

pages

551-562

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(16)30602-9

journal_volume

340

pub_type

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