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Microglia Purinoceptor P2Y6: An Emerging Therapeutic Target in CNS Diseases
Shehata Anwar1,2, Vincent Pons1, Serge Rivest1
1Neuroscience Laboratory, CHU de Québec Research Center (CHUL), Department of Molecular Medicine, Faculty of Medicine, Laval University, Québec City, QC G1V 0A6, Canada.
Abstract:
The purinergic receptor P2Y6 is expressed in immune cells, including the microglia that are implicated in neurological disorders. Its ligand, UDP, is a signaling molecule that can serve as an "find-me" signal when released in significant quantities by damaged/dying cells. The binding of UDP by P2Y6R leads to the activation of different biochemical pathways, depending on the disease context and the pathological environment. Generally, P2Y6R stimulates phagocytosis. However, whether or not phagocytosis coincides with cell activation or the secretion of pro-inflammatory cytokines needs further investigation. The current review aims to discuss the various functions of P2Y6R in some CNS disorders. We present evidence that P2Y6R may have a detrimental or beneficial role in the nervous system, in the context of neurological pathologies, such as ischemic stroke, Alzheimer's disease, Parkinson's disease, radiation-induced brain injury, and neuropathic pain.
Insights
The P2Y6 receptor, found on microglia, plays a dual role in neurological disorders by responding to cell damage signals. Its function can be either harmful or helpful depending on the specific central nervous system (CNS) disease context.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- The purinergic receptor P2Y6 (P2Y6R) is expressed in immune cells, notably microglia, which are crucial in neurological disorders.
- UDP, the ligand for P2Y6R, acts as a damage signal released by injured or dying cells.
- P2Y6R activation influences various biochemical pathways, with its precise role varying based on disease context and pathology.
Purpose of the Study:
- To review the diverse functions of the P2Y6 receptor in several central nervous system (CNS) disorders.
- To explore the dual role of P2Y6R, highlighting its potential detrimental or beneficial impact in neurological conditions.
Main Methods:
- Literature review of studies investigating P2Y6R function in CNS disorders.
- Analysis of evidence regarding P2Y6R's role in microglial activation and phagocytosis.
- Examination of P2Y6R's involvement in pathological conditions including ischemic stroke, Alzheimer's disease, Parkinson's disease, radiation-induced brain injury, and neuropathic pain.
Main Results:
- P2Y6R generally promotes phagocytosis, a key microglial function.
- The interplay between P2Y6R-mediated phagocytosis, cell activation, and pro-inflammatory cytokine secretion requires further elucidation.
- Evidence suggests P2Y6R can exert both damaging and protective effects within the CNS during disease.
Conclusions:
- The P2Y6 receptor is a significant modulator of microglial activity in the CNS.
- Understanding the context-dependent roles of P2Y6R is critical for developing targeted therapies for neurological diseases.
- Further research is needed to fully delineate the mechanisms underlying P2Y6R's beneficial and detrimental functions in various neuropathologies.
