Prostaglandin biosynthesis can be triggered by lipid peroxides

ME Hemler, HW Cook, WEM Lands - Archives of biochemistry and …, 1979 - Elsevier
ME Hemler, HW Cook, WEM Lands
Archives of biochemistry and biophysics, 1979Elsevier
Studies of ferriheme cyclooxygenase, using two different assay systems, show that a variety
of peroxides can trigger a rapid acceleration of cyclooxygenase activity to produce
prostaglandins. Lipid hydroperoxides formed by lipoxygenase were the most potent
activators tested, followed by prostaglandin G 2, which was slightly less potent. Peroxides
nonspeciflcally generated during arachidonate autoxidation were as potent as the
enzymatically formed lipid peroxides. These findings have important implications for cell …
Abstract
Studies of ferriheme cyclooxygenase, using two different assay systems, show that a variety of peroxides can trigger a rapid acceleration of cyclooxygenase activity to produce prostaglandins. Lipid hydroperoxides formed by lipoxygenase were the most potent activators tested, followed by prostaglandin G2, which was slightly less potent. Peroxides nonspeciflcally generated during arachidonate autoxidation were as potent as the enzymatically formed lipid peroxides. These findings have important implications for cell function since any process which generates peroxides may activate the cyclooxygenase. Thus the balance between formation and removal of cellular lipid peroxides sets a peroxide tone that can regulate the rate of prostaglandin formation in cells.
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