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The effects of linoleate hydroperoxide on respiration and oxidative phosphorylation of rat liver mitochondria.

Linoleate hydropepoxide, purified by silica gel chromatography and at concentrations 70-100 nmol/mg mitochondrial protein, activated state 4 respiration and Mg-ATPase activity of mitochondria to levels of 80% and 25%, respectively, of those induced by 300 microM DNP, and completely inhibited oxidative phosphorylation. These effects are the same as those caused by linoleate, but the hydroperoxide caused more rapid degeneration of the activated respiration of mitochondria than linoleate. Further addition of the hydroperoxide induced oligomycin-insensitive Mg-ATPase to a level 3 times that obtained with DNP, accompanied by clearing of the mitochondrial suspension and release of malate dehydrogenase from the matrix. The extent of the effects caused by the methyl ester of linoleate hydroperoxide was much less than by the free acid.