Changing the Conformation State of Cytochrome b 558 Initiates NADPH Oxidase Activation

Involvement of Activation of Nadph Oxidase

ABSTRACT Zinc is employed as a supplement; however, zinc-related nephropathy is not generally known. In this study, we investigatecl zinc-induced renal cell iajury using a pig kidney-derived cultured renal epithelial cell line, LLC-PKI, with proximal kidney tubule-like features, and examined the involvement of free radicals and extracellular signal-regu]ated kinase (ERK) in the cell injury. The...

Molecular Interface of S100A8 with Cytochrome b558 and NADPH Oxidase Activation

S100A8 and S100A9 are two calcium binding Myeloid Related Proteins, and important mediators of inflammatory diseases. They were recently introduced as partners for phagocyte NADPH oxidase regulation. However, the precise mechanism of their interaction remains elusive. We had for aim (i) to evaluate the impact of S100 proteins on NADPH oxidase activity; (ii) to characterize molecular interaction...

Mitochondrial regulation of caspase activation by cytochrome oxidase and tetramethylphenylenediamine via cytosolic cytochrome c redox state.

Cytochrome c release from mitochondria induces caspase activation in cytosols; however, it is unclear whether the redox state of cytosolic cytochrome c can regulate caspase activation. By using cytosol isolated from mammalian cells, we find that oxidation of cytochrome c by added cytochrome oxidase stimulates caspase activation, whereas reduction of cytochrome c by added tetramethylphenylenedia...

During Phagocytosis NADPH Oxidase Activation and Assembly

Chronic granulomatous disease due to granulocytes with abnormal NADPH oxidase activity and deficient cytochrome-b.

A patient with an X-linked genetic disease resembling chronic granulomatous disease (CGD) but differing in several aspects from previously studied cases is described. The oxidase enzyme of the patient's granulocytes was normally activated, but had reduced activity as shown by an increased Michaelis constant and decreased maximum velocity of NADPH-dependent superoxide production. Cytochrome-b wa...