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Neuronal oxidative damage from activated innate immunity is EP2 receptor-dependent
Thomas J Montine1, Dejan Milatovic, Ramesh C Gupta
1Department of Pathology, Vanderbilt University, Nashville, Tennessee, USA. tmontine@u.washington.edu
Journal of Neurochemistry
|November 9, 2002
Summary
Prostaglandin E2 (PGE2) signaling contributes to brain oxidative damage after innate immunity activation. Targeting the EP2 receptor may reduce this damage, offering a potential therapeutic strategy for brain diseases.
Area of Science:
- Neuroscience
- Immunology
- Biochemistry
Background:
- Elevated prostaglandin E2 (PGE2) and oxidative damage are linked to brain diseases involving innate immunity.
- Activation of innate immunity in the brain can lead to oxidative stress and neuronal damage.
Purpose of the Study:
- To investigate if cerebral oxidative damage from innate immune activation is mediated by PGE2 signaling.
- To explore the role of the prostaglandin E2 receptor subtype 2 (EP2) in LPS-induced oxidative damage.
Main Methods:
- Administered intracerebroventricular (icv) lipopolysaccharide (LPS) to activate innate immunity in the brain.
- Measured lipid peroxidation biomarkers: F2-isoprostanes (IsoPs) and F4-neuroprostanes (NeuroPs).
- Utilized indomethacin, ibuprofen, and EP2 receptor knockout mice to assess the involvement of PGE2 and EP2 signaling.
Main Results:
- LPS induced delayed increases in cerebral F2-IsoPs and F4-NeuroPs, suppressed by indomethacin or ibuprofen.
- Cerebral oxidative damage induced by LPS was abolished in EP2 receptor knockout mice.
- Oxidative damage from kainic acid (KA) was rapid, suppressed by NSAIDs, but independent of EP2 receptor activation.
Conclusions:
- PGE2-mediated signaling, specifically through the EP2 receptor, plays a critical role in LPS-induced cerebral oxidative damage.
- The EP2 receptor is a potential therapeutic target for mitigating oxidative damage resulting from innate immune activation in the brain.
- Reduced nitric oxide synthase (NOS) activity partially contributed to the protective effects of EP2 receptor deletion.