Cited by 24Adenosine and Purinergic SignalingNeuroscience and Neuropharmacology ResearchPain Mechanisms and Treatments

Potentiation of the glutamatergic synaptic input to rat locus coeruleus neurons by P2X7 receptors

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Khakpay, Roghayeh, Polster, Daniel, Köles, Laszlo, Skorinkin, Andrey, Szabo, Bela, Wirkner, Kerstin, Illes, Peter·2010·Purinergic Signalling

Abstract

Locus coeruleus (LC) neurons in a rat brain slice preparation were superfused with a Mg(2+)-free and bicuculline-containing external medium. Under these conditions, glutamatergic spontaneous excitatory postsynaptic currents (sEPSCs) were recorded by means of the whole-cell patch-clamp method. ATP, as well as its structural analogue 2-methylthio ATP (2-MeSATP), both caused transient inward currents, which were outlasted by an increase in the frequency but not the amplitude of the sEPSCs. PPADS, but not suramin or reactive blue 2 counteracted both effects of 2-MeSATP. By contrast, α,β-methylene ATP (α,β-meATP), UTP and BzATP did not cause an inward current response. Of these latter agonists, only BzATP slightly facilitated the sEPSC amplitude and strongly potentiated its frequency. PPADS and Brilliant Blue G, as well as fluorocitric acid and aminoadipic acid prevented the activity of BzATP. Furthermore, BzATP caused a similar facilitation of the miniature (m)EPSC (recorded in the presence of tetrodotoxin) and sEPSC frequencies (recorded in its absence). Eventually, capsaicin augmented the frequency of the sEPSCs in a capsazepine-, but not PPADS-antagonizable, manner. In conclusion, the stimulation of astrocytic P2X7 receptors appears to lead to the outflow of a signalling molecule, which presynaptically increases the spontaneous release of glutamate onto LC neurons from their afferent fibre tracts. It is suggested, that the two algogenic compounds ATP and capsaicin utilise separate receptor systems to potentiate the release of glutamate and in consequence to increase the excitability of LC neurons.

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  • Participation of P2X7R localized in glial cells on the net effect on glutamate release has been indicated by radiolabeled studies in murine cortical astrocyte cultures and whole-cell patch-clamp analysis.

    “However, participation of P2X7R localized in glial-cells on the net effect on glutamate release has also been indicated by radiolabeled studies in murine cortical astrocyte cultures [110] and whole-cell patch-clamp analysis [111].”

    From P2X7 Receptor Signaling in Stress and Depression (2019) · cites this paper as [111]

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Authors
Khakpay, R., Polster, D., Köles, L., Skorinkin, A., Szabo, B., Wirkner, K., & Illes, P.
Affiliations
  • Leipzig University (DE)
  • Kazan Federal University (RU)
Venue
Purinergic Signalling
Published
2010-07-30
Volume
6
Issue
3
Pages
349-359
ISSN
  • 1573-9538 (ISSN-L)
  • 1573-9546
OpenAlex
W1976813835
Cited by
24
References
56
Citations by year
2025: 1 · 2024: 1 · 2023: 2 · 2021: 2 · 2019: 1 · 2017: 2 · 2016: 1 · 2015: 3 · 2014: 3 · 2013: 2 · 2012: 4
FWCI
1.75
Type
journal article
Language
en
Open access
Locations
  • Purinergic Signalling (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Deutscher Akademischer Austauschdienst
  • Deutsche Forschungsgemeinschaft (IL 20/16-1)
  • Volkswagen Foundation
  • Tarbiat Modares University
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Adenosine and Purinergic Signaling
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
Keywords
locus coeruleus, P2X7 receptor, glutamatergic synaptic input, spontaneous excitatory postsynaptic currents, ATP, 2-methylthio-ATP, BzATP, presynaptic glutamate release, astrocytes, capsaicin, PPADS, neuronal excitability

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