Nicotinamide adenine dinucleotide phosphate oxidase complex (NOX2) (NOX2)

The neutrophil superoxide anion generation pathway is a fundamental mechanism of the innate immune system, primarily executed by the Nicotinamide adenine dinucleotide phosphate (NADPH) oxidase complex, specifically the NOX2 isoform (UniProt: P04839). This enzyme complex is composed of membrane-bound subunits, including Cytochrome b-245 heavy chain (gp91phox) and light chain (p22phox), and several cytosolic regulatory subunits such as p47phox, p67phox, and p40phox (PubMed: 22226317). Upon activation by inflammatory stimuli, these components assemble at the membrane to transfer electrons from NADPH to molecular oxygen, producing superoxide anions (O2•−) in a process known as the respiratory burst (PubMed: 15013790). This pathway is essential for the destruction of phagocytosed pathogens, and its genetic deficiency leads to Chronic Granulomatous Disease (CGD), characterized by severe recurrent infections (StatPearls: NBK537072). Conversely, excessive superoxide production is a major driver of oxidative stress and tissue damage in chronic inflammatory diseases, cardiovascular disorders, and neurodegeneration (PubMed: 28249116). Therapeutic targeting of this pathway involves small molecule inhibitors like GSK2795039, which aim to reduce pathological ROS levels while ideally preserving sufficient immune function (PubChem: CID 118971114).

Other names

Neutrophil NADPH oxidaseRespiratory burst oxidasegp91phox complexCytochrome b-245Neutrophil superoxide anion generation pathway

Inhibition of the NADPH oxidase complex to prevent the transfer of electrons from NADPH to molecular oxygen, or prevention of the assembly of cytosolic regulatory subunits with the membrane-bound cytochrome b-245 complex (PubMed: 28249116).