Mechanisms for activation and signaling of NADPH oxidase 1 involved in cell proliferation

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We established the method for production of Noxa1, an essential activating factor for Nox1 using E. coli. We also succeeded to express and purifyβPix andβ-actin, which may influence the activation of Nox1. We examined the cell-free activation of Nox1 using Caco-2 plasma membrane as an enzyme source. We also clarified the kinetic properties of Noxa1 in a pure cell-free activation system containing Nox2 purified from porcine neutrophils. The model cell system of Nox1 was established using HEK293 cells transfected with Nox1 cDNA as well as cDNAs for Noxa1 and Noxo1. The effect ofβPix, a putative GEF for Rac, on the activation of Nox enzymes was examined in cell and cell-free system.