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In the kidney, a high salt intake favors oxidative stress and hypoxia and causes the development of fibrosis. Both atrial natriuretic peptide (ANP) and hypoxia inducible factor (HIF-1 α ) exert cytoprotective effects. We tested the hypothesis that renal expression of ANP and HIF-1 α  is involved in a mechanism responding to the oxidative stress produced in the kidneys of rats chronically fed a high sodium diet. Sprague-Dawley rats were fed with a normal salt (0.4% NaCl) (NS) or a high salt (8% NaCl) (HS) diet for 3 weeks, with or without the administration of tempol (T), an inhibitor of oxidative stress, in the drinking water. We measured the mean arterial pressure (MAP), glomerular filtration rate (GFR), and urinary sodium excretion (UV Na ). We evaluated the expression of ANP, HIF-1 α , and transforming growth factor (TGF- β 1) in renal tissues by western blot and immunohistochemistry. The animals fed a high salt diet showed increased MAP and UV Na  levels and enhanced renal immunostaining of ANP, HIF-1 α , and TGF- β 1. The administration of tempol together with the sodium overload increased the natriuresis further and prevented the elevation of blood pressure and the increased expression of ANP, TGF- β 1, and HIF-1 α  compared to their control. These findings suggest that HIF-1 α  and ANP, synthesized by the kidney, are involved in an adaptive mechanism in response to a sodium overload to prevent or attenuate the deleterious effects of the oxidative stress and the hypoxia on the development of fibrosis.

biomed research international

Renal Overexpression of Atrial Natriuretic Peptide and Hypoxia Inducible Factor-1<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi mathvariant="bold-italic">α</mml:mi></mml:mrow></mml:math>as Adaptive Response to a High Salt Diet

Renal Overexpression of Atrial Natriuretic Peptide and Hypoxia Inducible Factor-1αas Adaptive Response to a High Salt Diet