Spinal NF-kB activation induces COX-2 upregulation and contributes to inflammatory pain hypersensitivity

The European Journal of Neuroscience
Kyung-Min LeeHee-Jung Cho

Abstract

Cyclooxygenase-2 (COX-2) is a major contributor to the elevation of spinal prostaglandin E2, which augments the processing of nociceptive stimuli following peripheral inflammation, and dynorphin has been shown to have an important role in acute and chronic pain states. Moreover, the transcription factor, nuclear factor-kappa B (NF-kB), regulates the expressions of both COX-2 and dynorphin. To elucidate the role of spinal NF-kB in the induction of inflammatory pain hypersensitivity, we examined whether activated NF-kB affects pain behavior and the expressions of the mRNAs of COX-2 and prodynorphin following peripheral inflammation. Intrathecal pretreatment with different NF-kB inhibitors, namely, NF-kB decoy or pyrrolidine dithiocarbamate, significantly reduced mechanical allodynia and thermal hyperalgesia following unilateral hindpaw inflammation evoked by complete Freund's adjuvant (CFA). These NF-kB inhibitors also suppressed the activation of spinal NF-kB and the subsequent remarkable elevation of spinal COX-2 mRNA, but not that of prodynorphin mRNA. In addition, the activation of spinal NF-kB following CFA injection was inhibited by intrathecal pretreatments with interleukin-1 beta receptor antagonist or caspase-1 inhibitor...Continue Reading

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