Up‐regulation of cyclooxygenase‐2 mRNA in the rat spinal cord following peripheral inflammation

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Abstract
Prostaglandins (PG) have been described as mediators in spinal nociceptive processing after peripheral inflammation. Enzymes essential for PG biosynthesis, cyclooxygenase isozymes COX‐1 and COX‐2, have not yet been investigated in the spinal cord. In two studies on rats with adjuvant‐induced peripheral inflammation levels of mRNA expression of both COX isoforms were analyzed in the lumbar section of the spinal cord using reverse transcription‐polymerase chain reaction (RT‐PCR) technique. We could show that mRNA of both COX isoforms is expressed constitutively in the spinal cord with COX‐2 as the predominant isoform. Six hours after induction of peripheral inflammation, levels of COX‐2 mRNA expression were raised significantly in respect to untreated control rats and returned to baseline within 3 days after induction of inflammation. COX‐2 might therefore be regarded as the COX isozyme responsible for spinal PG release in nociceptive processing under a peripheral inflammatory stimulus.