A Fluorescently Tagged C-Terminal Fragment of p47phoxDetects NADPH Oxidase Dynamics during Phagocytosis

A fluorescently tagged C-terminal fragment of p47phox detects NADPH oxidase dynamics during phagocytosis.

The assembly of cytosolic p47(phox) and p67(phox) with flavocytochrome b(558) at the membrane is crucial for activating the leukocyte NADPH oxidase that generates superoxide for microbial killing. p47(phox) and p67(phox) are linked via a high-affinity, tail-to-tail interaction involving a proline-rich region (PRR) and a C-terminal SH3 domain (SH3b), respectively, in their C-termini. This intera...

During Phagocytosis NADPH Oxidase Activation and Assembly

phagocytosis, and NADPH oxidase

The contributing role of environmental factors to the development of Parkinson’s disease has become increasingly evident. We report that mesencephalic neuron-glia cultures treated with diesel exhaust particles (DEP; 0.22 μM) (5–50 μg/ml) resulted in a dose-dependent decrease in dopaminergic (DA) neurons, as determined by DA-uptake assay and tyrosine-hydroxylase immunocytochemistry (ICC). The se...

Regulation of the C. elegans NADPH Oxidase

Reactive oxygen species are derived from oxygen and produced during microbial infections of mammals. NADPH oxidases, such as DUOX, catalyze the first step in ROS synthesis, forming superoxide and subsequently hydrogen peroxide. C. elegans expresses a DUOX enzyme encoded by the gene bli-3. It is believed that DUOX may be involved in host defenses in C. elegans against S. cerevisiae. Its activity...

The phosphoinositide-binding protein p40phox activates the NADPH oxidase during FcγIIA receptor–induced phagocytosis

Superoxide produced by the phagocyte reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase is essential for host defense. Enzyme activation requires translocation of p67(phox), p47(phox), and Rac-GTP to flavocytochrome b558 in phagocyte membranes. To examine the regulation of phagocytosis-induced superoxide production, flavocytochrome b558, p47(phox), p67(phox), and the FcgammaIIA...