NOX1

NOX1 encodes a member of the NADPH oxidase family that catalyzes oxygen reduction and generates reactive oxygen species, including superoxide or hydrogen peroxide[1]. Mechanistically, NOX1 drives redox-dependent signaling in vascular smooth muscle cells, where NOX1 supports nonstimulated and angiotensin II-stimulated superoxide production, while NOX4 mainly supports basal H2O2 production[2]. In colonic biology, NOX1 links microbiota-responsive TLR input to EGFR redox activation and potentiates colonic stem cell proliferation[3]. In colon cancer models, NOX1 supports the proliferative phenotype of colon cancer cells through reactive oxygen species-dependent signal transduction[4]. In cancer stem-like models, NOX1-derived ROS activates mTORC1 through S100A9 oxidation in VPS41-/VPS39-positive lysosomes, promoting colon cancer progression[5]. Compared with related isoforms, NOX1 is experimentally distinguished from NOX4 by stronger association with superoxide production and mitogenic signaling, whereas NOX4 can act through H2O2-linked basal signaling[2][6]. For experimental applications, GKT137831/setanaxib functions as a dual NOX1/NOX4 inhibitor in disease models, including diabetic microvascular and macrovascular injury[7]. NOX1-selective inhibitor development also supports colon and stomach cancer cell proliferation studies[8].
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