Activation of O2−‐generating oxidase in an heterologous cell‐free system derived from Epstein‐Barr‐virus‐transformed human B lymphocytes and bovine neutrophils

作者: Laurence COHEN-TANUGI , Francoise MOREL , Marie-Claire PILLOUD-DAGHER , Jean Marie SEIGNEURIN , Patrice FRANCOIS

DOI: 10.1111/J.1432-1033.1991.TB16419.X

关键词:

摘要: Epstein-Barr-virus-transformed human B lymphocytes (EBV lymphocytes) stimulated by 4β-phorbol 12-myristate 13-acetate exhibit an NADPH-dependent oxidase activity capable of generating the superoxide anion O2−, similar to, but less efficient than that activated neutrophils. A cell-free system activation consisting a membrane fraction and cytosol from EBV lymphocyte homogenate supplemented with guanosine 5′-[γ-thio]triphosphate (GTP[S]), arachidonic acid Mg2+ was found to be competent in production assessed superoxide-dismutase-sensitive reduction cytochrome c presence NADPH. However, slow largely insensitive both dismutase, iodonium biphenyl, powerful inhibitor markedly faster eduction NADPh obtained heterologous bovine neutrophil membranes, GTP[S], Mg2+; this system, totally inhibited dismutase biphenyl. These results show contain substantial amount cytosolic factors activation, limiting for O2− are components complex. The membranes provided rapid convenient method diagnose defects autosomal forms chronic granulomatous disease. In addition, it might useful tool explore mechanism action activation.

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