Abstract
Prostaglandins (PG's), produced from arachidonic acid metabolism, are potent mediators of inflammation. Nonsteroidal anti-inflammatory (NSAIDs) exert their effects by inhibition of prostaglandin endoperoxide synthase (PGHS) enzyme, which catalyses the first committed step in arachidonic acid metabolism. Two isoforms of PGHS are known: PGHS-1, constitutively expressed in most tissues, and is responsible for physiological production of PG's. The second isoform, PGHS-2, is induced by cytokines, mitogens and endotoxins in inflammatory cells, and appears to be responsible for the elevated production of PG's during inflammation. With the recent discovery of the inducible PGHS (PGHS-2), the medicinal chemist now possesses a novel target for designing therapeutic agents that could provide suitable anti-inflammatory activity without the ulcerogenic and renal side effects associated with currently available NSAIDs, all of which inhibit both PGHS-1 and PGHS-2.
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