Cyclooxygenase Dynamics in Neuroinflammatory Diseases

Cyclooxygenase (COX) enzymes, comprising COX-1 and COX-2 isoforms, orchestrate the conversion of arachidonic acid into bioactive prostanoids that modulate neuroinflammatory cascades. Under homeostatic conditions, COX-1 is constitutively expressed in microglia and macrophages, contributing to baseline prostanoid synthesis, whereas COX-2 is inducible in neurons and astrocytes during inflammatory insults. In acute and chronic neurodegenerative disorders—including Alzheimer’s disease, Parkinson’s disease, multiple sclerosis and stroke—imbalances in COX-mediated prostaglandin E2 production exacerbate glial activation, blood–brain barrier disruption and neuronal injury. Emerging evidence reveals that COX-1 may exert both early protective roles via resolution-promoting lipid mediators and, paradoxically, contribute to sustained inflammation when over-activated. COX-2 dynamics likewise display duality: acute upregulation can facilitate neurovascular repair, yet prolonged expression amplifies excitotoxicity and oxidative stress. Understanding the spatiotemporal regulation of COX isoforms in the central nervous system is therefore crucial for designing interventions that temper detrimental inflammation while preserving homeostatic signalling. Recent advances in pharmacological selectivity, molecular imaging and gene-expression profiling illuminate distinct roles for each isoform, offering refined strategies for therapeutic modulation and biomarker development.

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Cyclooxygenase Dynamics in Neuroinflammatory Diseases publication trend

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Technical terms

Cyclooxygenase (COX): A family of enzymes (COX-1 and COX-2) that catalyse the conversion of arachidonic acid into prostanoids, including pro-inflammatory and pro-resolving mediators.

Microglia: Resident immune cells of the central nervous system that respond to injury and infection by releasing cytokines, reactive oxygen species and prostaglandins.

Prostaglandin E2 (PGE2): A key lipid mediator produced by COX enzymes that regulates inflammation, vascular permeability and neuronal signalling.

Positron Emission Tomography (PET): A non-invasive imaging technique that uses radiolabelled tracers to visualise and quantify molecular processes, such as enzyme expression, in living subjects.

References

1. m-Terphenylamines, Acting as Selective COX-1 Inhibitors, Block Microglia Inflammatory Response and Exert Neuroprotective Activity. Molecules (2023).
2. PET measurement of cyclooxygenase-2 using a novel radioligand: upregulation in primate neuroinflammation and first-in-human study. Journal of Neuroinflammation (2020).
3. Highly Selective Cyclooxygenase-1 Inhibitors P6 and Mofezolac Counteract Inflammatory State both In Vitro and In Vivo Models of Neuroinflammation. Frontiers in Neurology (2017).