NADPH oxidase (NOX)-derived reactive oxygen species (ROS) are implicated in the pathophysiology of hypertension in chronic kidney disease patients. Genetic deletion of NOX activator 1 (Noxa1) subunit of NOX1 decreases ROS under pathophysiological conditions. Here, we investigated the role of NOXA1-dependent NOX1 activity in the pathogenesis of angiotensin II (Ang II)-induced hypertension (AIH) and possible involvement of abnormal renal function.
Results:
NOXA1 is present in epithelial cells of Henle's thick ascending limb and distal nephron. Telemetry showed lower basal systolic blood pressure (BP) in Noxa1−/−versus wild-type mice. Ang II infusion for 1 and 14 days increased NOXA1/NOX1 expression and ROS in kidney of male but not female wild-type mice. Mean BP increased 30 mmHg in wild-type males, with smaller increases in Noxa1-deficient males and wild-type or Noxa1−/− females. In response to an acute salt load, Na+ excretion was similar in wild-type and Noxa1−/− mice before and 14 days after Ang II infusion. However, Na+ excretion was delayed after 1–2 days of Ang II in male wild-type versus Noxa1−/− mice. Ang II increased epithelial Na+ channel (ENaC) levels and activation in the collecting duct principal epithelial cells of wild-type but not Noxa1−/− mice. Aldosterone induced ROS levels and Noxa1 and Scnn1a expression and ENaC activity in a mouse renal epithelial cell line, responses abolished by Noxa1 small-interfering RNA.
Innovation and Conclusion:
Ang II activation of renal NOXA1/NOX1-dependent ROS enhances tubular ENaC expression and Na+ reabsorption, leading to increased BP. Attenuation of AIH in females is attributed to weaker NOXA1/NOX1-dependent ROS signaling and efficient natriuresis. Antioxid. Redox Signal. 36, 550–566.
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