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Department of Biochemistry, A. B. Hancock Jr. Memorial Laboratory for Cancer Research, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA
Prostaglandins and NO. are important mediators of inflammation and other physiological and pathophysiological processes. Continuous production of these molecules in chronic inflammatory conditions has been linked to development of autoimmune disorders, coronary artery disease, and cancer. There is mounting evidence for a biological relationship between prostanoid biosynthesis and NO. biosynthesis. Upon stimulation, many cells express high levels of nitric oxide synthase (NOS) and prostaglandin endoperoxide synthase (PGHS). There are reports of stimulation of prostaglandin biosynthesis in these cells by direct interaction between NO. and PGHS, but this is not universally observed. Clarification of the role of NO. in PGHS catalysis has been attempted by examining NO. interactions with purified PGHS, including binding to its heme prosthetic group, cysteines, and tyrosyl radicals. However, a clear picture of the mechanism of PGHS stimulation by NO. has not yet emerged. Available studies suggest that NO. may only be a precursor to the molecule that interacts with PGHS. Peroxynitrite (from O2.-+NO.) reacts directly with PGHS to activate prostaglandin synthesis. Furthermore, removal of O2.- from RAW 267.4 cells that produce NO. and PGHS inhibits prostaglandin biosynthesis to the same extent as NOS inhibitors. This interaction between reactive nitrogen species and PGHS may provide new approaches to the control of inflammation in acute and chronic settings.—Goodwin, D. C., Landino, L. M., Marnett, L. J. Effects of nitric oxide and nitric oxide-derived species on prostaglandin endoperoxide synthase and prostaglandin biosynthesis.
Key Words: PGHS • NOS • NO. • interferon • peroxynitrite
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