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Rat peritoneal macrophages, which were induced by intraperitoneal injection of vitamin E for 6 successive days, contained 387.6 to 569.0 ng alpha-tocopherol/10(6) cells and produced 0.9 to 1.5 nmol O2-/min/10(6) cells following stimulation by phorbol myristate acetate (PMA). On the other hand, control macrophages contained 1.7 ng alpha-tocopherol/10(6) cells and produced 3.9 to 4.5 nmol O2-/min/10(6) cells. The particulate fraction of macrophages from vitamin E-treated rats contained 285.2 to 294.4 ng alpha-tocopherol/10(6) cells and showed scarcely any protein kinase C activity, whereas the specific activity of control rats showed 323 to 357 pmol/min/mg protein. From these results, we concluded that vitamin E seems to decrease O2- production from macrophages stimulated with PMA through inhibition of protein kinase C.
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