Abstract
There are two isozymes of prostaglandin endoperoxide (PGH) synthase (cyclooxygenase) called PGH synthase (PGHS)-1 and -2 or COX I and II. Both isozymes are able to catalyze the conversion of arachidonic acid to PGH2, the committed step in the formation of prostaglandins and thromboxane. PGHS-1 is present in virtually all mammalian tissues and organs (although not necessarily in all cells within an organ). In contrast, PGHS-2 is detectable by northern blotting only in a few tissues including prostate and brain. PGHS-2 has been detected in association with differentiation and cell turnover in cultured mammalian cells. The expression of this enzyme can be induced by several different cytokines and by phorbol esters. In particular, increases in PGHS-2 expression can be observed in activated macrophages. Although PGHS-1 (PGHS-1) has long been thought to be the site of action of non-steroidal anti-inflammatory drugs (NSAIDs), the discovery of a second isozyme (PGHS-2) and its potential association with inflammation has suggested that this latter enzyme may actually be the principal therapeutic target of NSAIDs. Using cDNAs for murine PGHS-1 and PGHS-2, we have expressed these two enzymes in vitro in cos-1 cells and compared the relative sensitivities of these enzymes to a series of common NSAIDs. Our results have established that murine PGHS-1 and -2 are pharmacologically distinct.
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Smith, W.L., Meade, E.A., Dewitt, D.L. (1997). Interaction of PGH Synthase Isozymes-1 and -2 with Nonsteroidal Anti-Inflammatory Drugs. In: Honn, K.V., Nigam, S., Marnett, L.J. (eds) Eicosanoids and Other Bioactive Lipids in Cancer, Inflammation, and Radiation Injury 2. Advances in Experimental Medicine and Biology, vol 400. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5325-0_28
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DOI: https://doi.org/10.1007/978-1-4615-5325-0_28
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