herbimycin and cystathionine-ketimine

The effects of d-cystathionine ketimine (D-CK) and l-cystathionine ketimine (L-CK) on the stimulus-induced superoxide generation by human neutrophils were compared. When the cells were preincubated with D-CK, the superoxide generation induced by arachidonic acid (AA), phorbol 12-myristate 13-acetate (PMA), and N-formyl-methionyl-leucyl-phenylalanine (fMLP) were enhanced, showing a dependence on D-CK concentration. The rate of enhancement by D-CK was AA > PMA > fMLP. On the contrary, L-CK largely enhanced the fMLP-induced superoxide generation, whereas it showed no effect on those induced by AA and PMA. The superoxide generations induced by AA and PMA in the D-CK-treated cells were suppressed by staurosporine, while those in the L-CK-treated cells were not affected. Genistein suppressed the fMLP-induced superoxide generation in the L-CK-treated cells more efficiently than that in the D-CK-treated cells. D-CK enhanced seryl phosphorylation of 16. 5-kDa protein in human neutrophils, while L-CK enhanced tyrosyl phosphorylation of 45-kDa protein.

Topics: 1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; Arachidonic Acid; Benzoquinones; Cystathionine; Enzyme Inhibitors; Genistein; Humans; Lactams, Macrocyclic; N-Formylmethionine Leucyl-Phenylalanine; Neutrophil Activation; Neutrophils; Phosphorylation; Protein-Tyrosine Kinases; Quinones; Rifabutin; Serine; Staurosporine; Stereoisomerism; Superoxides; Tetradecanoylphorbol Acetate; Tyrosine