The P2X7 receptor-pannexin-1 complex decreases muscarinic acetylcholine receptor-mediated seizure susceptibility in mice
- 1Department of Anatomy and Neurobiology, Institute of Epilepsy Research, College of Medicine, Hallym University, Chunchon, South Korea.
- 0Department of Anatomy and Neurobiology, Institute of Epilepsy Research, College of Medicine, Hallym University, Chunchon, South Korea.
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View abstract on PubMed
Summary
This summary is machine-generated.The P2X7R-Panx1 complex negatively regulates M1 receptor activity, reducing seizure susceptibility. Blocking this complex increases sensitivity to seizures, highlighting its neuroprotective role.
Area Of Science
- Neuroscience
- Cellular Biology
- Pharmacology
Background
- Pannexin-1 (Panx1) facilitates ATP and glutamate release in neurons and astrocytes.
- Extracellular ATP opens Panx1 via the P2X7 receptor (P2X7R) at resting membrane potential.
- Panx1 channel opening is linked to neuronal death and aberrant firing, but its role in neuronal activity requires elucidation.
Purpose Of The Study
- To investigate the role of the P2X7R-Panx1 complex in modulating muscarinic acetylcholine 1 (M1) receptor function.
- To determine the impact of P2X7R-Panx1 complex on seizure susceptibility mediated by M1 receptors.
Main Methods
- Utilized P2X7R knockout (P2X7-/-) mice and wild-type (WT) littermates.
- Administered pilocarpine (PILO), an M1 receptor agonist, to induce seizures.
- Employed P2X7R antagonists and gene silencing of P2X7R or Panx1 in WT mice.
- Assessed involvement of GABA and glutamate systems.
- Investigated the role of protein kinase C (PKC) and intracellular Ca2+ release.
Main Results
- P2X7-/- mice exhibited increased susceptibility to PILO-induced seizures compared to WT mice.
- This hypersensitivity was independent of GABA and glutamate systems.
- P2X7R antagonist administration and P2X7R or Panx1 gene silencing in WT mice also enhanced PILO-induced seizure susceptibility.
- The observed effects were mediated by PKC via intracellular Ca2+ release.
Conclusions
- The P2X7R-Panx1 complex acts as a negative modulator of M1 receptor-mediated seizure activity.
- Disruption of the P2X7R-Panx1 complex increases susceptibility to seizures.
- This complex plays a crucial role in regulating neuronal excitability and preventing excessive M1 receptor-driven activity in vivo.
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