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1. The movement of the cytoplasmic granules in the leucocidin-treated leucocyte is prevented in the presence of N-ethylmaleimide or menadione. This effect follows a change of state in the cytoplasm. It may not be due to reaction with SH groups. When granule movement is prevented in this way the subsequent addition of Ca(2+) and ATP does not induce the secretion of the proteins of the granules. 2. Menadione or iodoacetate stimulates some effects of suboptimum amounts of leucocidin. This effect probably follows a reaction with SH groups. 3. Flavine mononucleotide inhibits some effects of suboptimum amounts of leucocidin. 4. Leucocidin decreases the stimulation of glucose oxidation due to menadione but increases that due to flavine mononucleotide. Leucocidin decreases the adsorption of menadione by leucocytes but increases that of flavine mononucleotide. 5. The redox state of the nicotinamide-adenine nucleotide coenzymes is not altered during leucocidin action and flavine mononucleotide and menadione do not undergo significant continuous oxidation and reduction when added to the leucocyte.

The modification of the cytotoxic effect of leucocidin by N-Ethylmaleimide, Flavine Mononucleotide and Menadione