P2X7pre‐synaptic receptors in adult rat cerebrocortical nerve terminals: a role in ATP‐induced glutamate release
Abstract
Although growing evidence suggests that extracellular ATP might play roles in the control of astrocyte/neuron crosstalk in the CNS by acting on P2X(7) receptors, it is still unclear whether neuronal functions can be attributed to P2X(7) receptors. In the present paper, we investigate the location, pharmacological profile, and function of P2X(7) receptors on cerebrocortical nerve terminals freshly prepared from adult rats, by measuring glutamate release and calcium accumulation. The preparation chosen (purified synaptosomes) ensures negligible contamination of non-neuronal cells and allows exposure of 'nude' release-regulating pre-synaptic receptors. To confirm the results obtained, we also carried out specific experiments on human embryonic kidney 293 cells which had been stably transfected with rat P2X(7) receptors. Together, our findings suggest that (i) P2X(7) receptors are present in a subpopulation of adult rat cerebrocortical nerve terminals; (ii) P2X(7) receptors are localized on glutamatergic nerve terminals; (iii) P2X(7) receptors play a significant role in ATP-evoked glutamate efflux, which involves Ca(2+)-dependent vesicular release; and (iv) the P2X(7) receptor itself constitutes a significant Ca(2+)-independent mode of exit for glutamate.
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Studies in pure neuronal cell cultures and synaptosomes confirm that stimulation of P2X7R expressed in nerve terminals favors glutamate and GABA release.
“The effects mediated by P2X7R in glial cells and adenosine can be avoided in studies in pure neuronal cell cultures [106] and synaptosomes [107,108,109], which confirms that stimulation of P2X7R expressed in nerve terminals favors glutamate and GABA release.”
From P2X7 Receptor Signaling in Stress and Depression (2019) · cites this paper as [108]
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- Authors
- Marcoli, M., Cervetto, C., Paluzzi, P., Guarnieri, S., Alloisio, S., Thellung, S., Nobile, M., & Maura, G.
- Affiliations
- University of Genoa (IT)
- National Research Council (IT)
- Venue
- Journal of Neurochemistry
- Publisher
- Wiley
- Published
- 2008-02-28
- Volume
- 105
- Issue
- 6
- Pages
- 2330-2342
- ISSN
- 0022-3042 (ISSN-L)
- 1471-4159
- OpenAlex
- W1553995814
- Cited by
- 70
- References
- 57
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 3 · 2021: 4 · 2020: 3 · 2019: 1 · 2018: 2 · 2017: 3 · 2016: 4 · 2015: 13 · 2014: 5 · 2013: 5 · 2012: 9
- FWCI
- 2.24
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Neurochemistry (publishedVersion)
- PubMed (publishedVersion)
- CINECA IRIS Institutial Research Information System (University of Genoa) (submittedVersion)
- Funders
- Ministero dell’Istruzione, dell’Università e della Ricerca
- Fondazione Pierfranco e Luisa Mariani
- 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
- P2X7 receptor, glutamate release, ATP, synaptosomes, calcium accumulation, vesicle release, glutamatergic terminals, astrocyte-neuron crosstalk
- MeSH terms
- Adenosine Triphosphate, Age Factors, Animals, Cell Line, Cerebral Cortex, Humans, Male, Rats, Sprague-Dawley, Presynaptic Terminals, Receptors, Purinergic P2, Glutamic Acid, Rats, Receptors, Purinergic P2X7
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