Abstract
Cyclooxygenase-2 (COX-2) activity has been implicated in the pathogenesis of cerebral ischemia. To determine whether COX-2 activity within the neuron itself exacerbates hypoxic neuronal injury, neuron-enriched cultures were subjected to anoxia. Treatment with COX-2 selective antagonists decreased cell death. Neurons cultured from homozygous COX-2 gene disrupted mice were resistant to hypoxia compared to those of heterozygotes. Infection of primary neurons with AAV expressing COX-2 exacerbated cell death compared to neurons infected with enhanced green fluorescent protein (EGFP) control vector. Addition of PGE2, PGD2 or PGF2α to the medium exacerbated injury, suggesting that the deleterious effects of COX-2 overexpression in hypoxia could be mediated by direct receptor mediated effects of prostaglandins. Overexpression of COX-2 did not increase expression of cyclin D1 or phosphoretinoblastoma protein (pRb), or cleavage of caspase 3 suggesting that this cell cycle mechanism does not mediate COX-2 toxicity in this model.
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This work was supported by National Institutes of Health, National Institute of Neurological Diseases and Stroke Grant No R01-NS37459 (SHG), the VA Merit Review Program (SHG) and the National Institutes of Health, National Institute of Child Health and Human Development Grant No. KO8-HD40848 (RWH), and the Competitive Medical Research Fund of the University of Pittsburgh Medical Center Health System (RWH).
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Li, W., Wu, S., Hickey, R.W. et al. Neuronal Cyclooxygenase-2 Activity and Prostaglandins PGE2, PGD2, and PGF2α Exacerbate Hypoxic Neuronal Injury in Neuron-enriched Primary Culture. Neurochem Res 33, 490–499 (2008). https://doi.org/10.1007/s11064-007-9462-2
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DOI: https://doi.org/10.1007/s11064-007-9462-2