The P2X7 Receptor: Central Hub of Brain Diseases
Roberta Andrejew1, Ágatha Oliveira-Giacomelli1, Deidiane Elisa Ribeiro1
1Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil.
Abstract:
The P2X7 receptor is a cation channel activated by high concentrations of adenosine triphosphate (ATP). Upon long-term activation, it complexes with membrane proteins forming a wide pore that leads to cell death and increased release of ATP into the extracellular milieu. The P2X7 receptor is widely expressed in the CNS, such as frontal cortex, hippocampus, amygdala and striatum, regions involved in neurodegenerative diseases and psychiatric disorders. Despite P2X7 receptor functions in glial cells have been extensively studied, the existence and roles of this receptor in neurons are still controversially discussed. Regardless, P2X7 receptors mediate several processes observed in neuropsychiatric disorders and brain tumors, such as activation of neuroinflammatory response, stimulation of glutamate release and neuroplasticity impairment. Moreover, P2X7 receptor gene polymorphisms have been associated to depression, and isoforms of P2X7 receptors are implicated in neuropsychiatric diseases. In view of that, the P2X7 receptor has been proposed to be a potential target for therapeutic intervention in brain diseases. This review discusses the molecular mechanisms underlying P2X7 receptor-mediated signaling in neurodegenerative diseases, psychiatric disorders, and brain tumors. In addition, it highlights the recent advances in the development of P2X7 receptor antagonists that are able of penetrating the central nervous system.
Insights
The P2X7 receptor, activated by adenosine triphosphate (ATP), plays a role in brain diseases. Targeting this receptor shows promise for treating neurodegenerative and psychiatric disorders.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- The P2X7 receptor is an ATP-gated cation channel implicated in cell death and ATP release.
- It is expressed in the central nervous system (CNS), particularly in regions affected by neurodegenerative and psychiatric disorders.
- While its role in glial cells is known, its function in neurons remains debated.
Purpose of the Study:
- To review the molecular mechanisms of P2X7 receptor signaling in CNS diseases.
- To discuss the involvement of P2X7 receptors in neuroinflammation, glutamate release, and neuroplasticity.
- To highlight P2X7 receptor antagonists for potential therapeutic applications in brain diseases.
Main Methods:
- Literature review of P2X7 receptor functions in the CNS.
- Analysis of P2X7 receptor involvement in neurodegenerative diseases, psychiatric disorders, and brain tumors.
- Examination of P2X7 receptor gene polymorphisms and disease associations.
Main Results:
- P2X7 receptors mediate neuroinflammatory responses, glutamate release, and neuroplasticity impairment.
- P2X7 receptor gene variations are linked to depression.
- Isoforms of P2X7 receptors are implicated in neuropsychiatric diseases.
Conclusions:
- The P2X7 receptor is a potential therapeutic target for various brain diseases.
- Development of CNS-penetrant P2X7 receptor antagonists is advancing.
- Further research into P2X7 receptor's neuronal roles is warranted.
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