Role of PLD−PKCζ signaling axis in p47phox phosphorylation for activation of NADPH oxidase by angiotensin II in pulmonary artery smooth muscle cells

We sought to determine the mechanism by which angiotensin II (ANGII) stimulates NADPH oxidase‐mediated superoxide (O2.−) production in bovine pulmonary artery smooth muscle cells (BPASMCs). ANGII‐induced increase in phospholipase D (PLD) and NADPH oxidase activities were inhibited upon pretreatment of the cells with chemical and genetic inhibitors of PLD2, but not PLD1. Immunoblot study revealed that ANGII treatment of the cells markedly increases protein kinase C‐α (PKC‐α), ‐δ, ‐ε, and ‐ζ levels in the cell membrane. Pretreatment of the cells with chemical and genetic inhibitors of PKC‐ζ, but not PKC‐α, ‐δ, and ‐ε, attenuated ANGII‐induced increase in NADPH oxidase activity without a discernible change in PLD activity. Transfection of the cells with p47phox small interfering RNA inhibited ANGII‐induced increase in NADPH oxidase activity without a significant change in PLD activity. Pretreatment of the cells with the chemical and genetic inhibitors of PLD2 and PKC‐ζ inhibited ANGII‐induced p47phox phosphorylation and subsequently translocation from cytosol to the cell membrane, and also inhibited its association with p22phox (a component of membrane‐associated NADPH oxidase). Overall, PLD−PKCζ−p47phox signaling axis plays a crucial role in ANGII‐induced increase in NADPH oxidase‐mediated O2.− production in the cells.

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