Cytochrome b-245 beta chain and NADPH oxidase 1 complex (NOX1/2)

The NADPH oxidase 1/2 complex refers to the enzymatic systems centered on the NOX1 and NOX2 (encoded by the CYBB gene) catalytic subunits, which are responsible for the deliberate production of reactive oxygen species (ROS). NOX2, also known as gp91phox, is the primary oxidase in phagocytes and is essential for the innate immune response, where it generates a 'respiratory burst' to destroy ingested pathogens [UniProt P04839, PubMed: 15459670]. NOX1 is predominantly expressed in the colon and vascular smooth muscle, playing a key role in cell signaling, blood pressure regulation, and inflammatory responses [UniProt Q9Y2E6, PubMed: 17145365]. Pathological overactivation of these complexes is implicated in a wide range of conditions, including atherosclerosis, hypertension, neurodegenerative diseases, and chronic inflammation, making them attractive therapeutic targets [PubMed: 25568011]. However, drug development is challenged by the need for isoform selectivity; for instance, complete inhibition of NOX2 can lead to immunodeficiency similar to Chronic Granulomatous Disease, while NOX1 inhibition is being explored for its potential to treat fibrotic and cardiovascular disorders [PubMed: 15459670, PubMed: 25568011].

Other names

CYBBgp91phoxNOX2NOX1Cytochrome b-245 beta chainNADPH oxidase 1Phagocyte NADPH oxidasep91-PHOX

Inhibition of the NADPH oxidase enzyme complex, specifically targeting the NOX1 and NOX2 catalytic subunits to prevent the transfer of electrons from NADPH to molecular oxygen, thereby reducing the generation of superoxide anions and downstream reactive oxygen species (ROS).