Abstract
Cyclooxygenase-2 (COX-2) is considered to play a major role in inflammation processes by catalyzing the production of prostaglandins (PGs). Using in situ hybridization histochemistry we studied the localization of COS-1 and COX-2 mRNA in the spinal cord and dorsal root ganglia (DRGs) after peripheral inflammation or after axotomy in the rat. No COX-2 mRNA signals were detected in the spinal cord under normal conditions, but strong expression was seen bilaterally in non-neuronal cells within the grey and white matter and along the leptomeninges and blood vessels 6 h after unilateral carrageenan injection into the hind paw, but not after peripheral nerve injury. The results suggest that COX-2 expressed in non-neuronal cells contributes to PG production in and around the spinal cord under peripheral inflammatory processes.
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