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Estrogen and P2 Purinergic Receptor Systems in Microglia: Therapeutic Targets for Neuroprotection
Jessica M Crain1, Jyoti J Watters
1Program in Cellular and Molecular Biology, University of Wisconsin, Madison, WI 53706.
Abstract:
Microglia, the primary resident immune cell population in the CNS, react to signals of injury or infection and produce inflammatory cytokines, chemokines, and reactive oxygen species, many of which can be neurotoxic in large quantities. Indeed microglial hyperactivation is thought to contribute to the pathology of many neurodegenerative disorders as well as ischemic and traumatic brain injuries, suggesting that agents with the capacity to target microglial activities may be beneficial for treating neuronal injury. In this review, we discuss two seemingly unrelated microglial receptor signaling systems that potently modulate many microglial properties; purinergic P2 and estrogen receptors. Purinergic receptors regulate key microglial functions, including their production of pro-inflammatory cytokines, neurotrophic factors, migration, phagocytosis and chemotaxis. Many of these same endpoints are also altered by estrogen receptor signaling in microglia. Here we summarize the current microglial research in both receptor areas, particularly as it relates to ischemic and traumatic CNS injuries. We provide evidence from our own laboratory of potential cross-talk between these receptor systems and discuss evidence indicating that both purinergic and estrogen receptors may represent useful therapeutic targets for the treatment of CNS disorders.
Insights
Microglia activation contributes to neurodegenerative disorders. Targeting purinergic P2 and estrogen receptors in microglia may offer new therapeutic strategies for central nervous system injuries.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglia are key immune cells in the central nervous system (CNS).
- Microglial hyperactivation contributes to neurodegenerative diseases and CNS injuries.
- Targeting microglial activity presents a potential therapeutic avenue for neuronal injury.
Purpose of the Study:
- To review microglial receptor signaling systems, specifically purinergic P2 and estrogen receptors.
- To explore the role of these receptors in modulating microglial functions relevant to CNS disorders.
- To discuss the therapeutic potential of targeting these receptors for CNS injuries.
Main Methods:
- Literature review of microglial research focusing on purinergic P2 and estrogen receptors.
- Summarization of current findings related to ischemic and traumatic CNS injuries.
- Presentation of laboratory evidence suggesting cross-talk between purinergic and estrogen receptor systems.
Main Results:
- Purinergic P2 receptors regulate microglial functions like cytokine production, migration, and phagocytosis.
- Estrogen receptors also influence similar microglial functions.
- Evidence suggests potential cross-talk between purinergic and estrogen receptor signaling pathways in microglia.
Conclusions:
- Both purinergic P2 and estrogen receptors significantly modulate microglial properties.
- These receptors influence key microglial functions relevant to CNS disorders.
- Purinergic and estrogen receptors represent promising therapeutic targets for treating CNS injuries.
