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Updated: Jul 6, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Purinergic modulation of microglial cell activation
1Department of Pharmacology, Institute of Experimental Medicine, Hungarian Academy of Sciences, 1450, Budapest, Hungary.
Abstract:
Microglial cells are resident macrophages in the brain and their activation is an important part of the brain immune response and the pathology of the major CNS diseases. Microglial activation is triggered by pathological signals and is characterized by morphological changes, proliferation, phagocytosis and the secretion of various cytokines and inflammatory mediators, which could be both destructive and protective for the nervous tissue. Purines are one of the most important mediators which regulate different aspects of microglial function. They could be released to the extracellular space from neurons, astrocytes and from the microglia itself, upon physiological neuronal activity and in response to pathological stimuli and cellular damage. Microglial activation is regulated by various subtypes of nucleotide (P2X, P2Y) and adenosine (A₁, A(₂A) and A₃) receptors, which control ionic conductances, membrane potential, gene transcription, the production of inflammatory mediators and cell survival. Among them, the role of P2X₇ receptors is especially well delineated, but P2X₄, various P2Y, A₁, A(₂A) and A₃ receptors also powerfully participate in the microglial response. The pathological role of microglial purine receptors has also been demonstrated in disease models; e.g., in ischemia, sclerosis multiplex and neuropathic pain. Due to their upregulation and selective activation under pathological conditions, they provide new avenues in the treatment of neurodegenerative and neuroinflammatory illnesses.
Insights
Microglial cells, the brain's immune cells, are activated by purines acting on specific receptors. Targeting these purinergic signaling pathways offers potential treatments for neurodegenerative and neuroinflammatory diseases.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglial cells are key players in brain immunity and CNS disease pathology.
- Microglial activation involves morphological changes, proliferation, and mediator secretion, impacting neural tissue.
- Purines released from various brain cells significantly regulate microglial functions.
Purpose of the Study:
- To explore the role of purinergic signaling in microglial activation.
- To investigate the involvement of nucleotide (P2X, P2Y) and adenosine (A1, A2A, A3) receptors in microglial responses.
- To highlight the therapeutic potential of targeting microglial purine receptors in CNS disorders.
Main Methods:
- Review of existing literature on microglial cell biology and purinergic signaling.
- Analysis of the roles of specific purine receptors (P2X, P2Y, A1, A2A, A3) in microglial function.
- Examination of evidence from disease models (ischemia, multiple sclerosis, neuropathic pain).
Main Results:
- Purines are crucial mediators regulating microglial activation through various receptor subtypes.
- Specific receptors like P2X7, P2X4, P2Y, A1, A2A, and A3 receptors are critical in microglial responses.
- Pathological roles of these receptors are evident in models of CNS diseases.
Conclusions:
- Microglial purinergic signaling is central to neuroinflammation and neurodegeneration.
- Upregulated purine receptors under pathological conditions are promising therapeutic targets.
- Targeting microglial purine receptors presents new treatment avenues for neurological illnesses.
