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P2X(7) receptors on microglial cells mediate injury to cortical neurons in vitro
- Source :
- Glia. 54(3)
- Publication Year :
- 2006
-
Abstract
- The P2X(7) receptor has been implicated in the release of cytokines and in the induction of cell death, and is up-regulated in a transgenic mouse model of Alzheimer's disease. Using cocultures of rat cortical neurons and microglia, we show that ATP and the more potent P2X(7) agonist benzoylbenzoyl-ATP (BzATP) cause neuronal cell injury. The deleterious effects of BzATP-treated microglia were prevented by nonselective P2X antagonists (PPADS and oxidized ATP) and by the more selective P2X(7) antagonist Brilliant Blue G. Similar concentrations of BzATP caused release of superoxide and nitric oxide from isolated microglia, and neuronal cell injury was attenuated by a superoxide dismutase mimetic and by a peroxynitrite decomposition catalyst, suggesting a role for reactive oxide species. Cocultures composed of wild-type cortical neurons, and microglia from P2X(7) receptor-deficient mice failed to exhibit neuronal cell injury in the presence of BzATP, but retained sensitivity to injury when microglia were derived from genotypically matched normal (P2X(7) (+/+) mice), thereby establishing P2X(7) involvement in the injury process. P2X(7) receptor activation on microglia thus appears necessary for microglial-mediated injury of neurons, and proposes that targeting P2X(7) receptors may constitute a novel approach for the treatment of acute and chronic neurodegenerative disorders where a microglial component is evident.
- Subjects :
- Biology
Nitric oxide
Cellular and Molecular Neuroscience
chemistry.chemical_compound
Mice
Adenosine Triphosphate
Superoxides
medicine
Animals
PPADS
Receptor
Cerebral Cortex
Mice, Knockout
Neurons
Microglia
L-Lactate Dehydrogenase
Receptors, Purinergic P2
Neurodegeneration
Purinergic receptor
medicine.disease
Coculture Techniques
Cell biology
Rats
medicine.anatomical_structure
nervous system
Neurology
chemistry
Neuroglia
Neuron
Receptors, Purinergic P2X7
Neuroscience
Subjects
Details
- ISSN :
- 08941491
- Volume :
- 54
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Glia
- Accession number :
- edsair.doi.dedup.....2d6a4a0b9d521ac8e8c3e526fddba430