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- W1987344408 abstract "Cx40-deficient mice (Cx40–/–) are hypertensive due to increased renin secretion. We evaluated the renal expression of neuronal nitric oxide synthase (nNOS) and cyclooxygenases COX-1 and COX-2, three macula densa enzymes. The levels of nNOS were increased in kidneys of Cx40–/– mice, as well as in those of wild-type (WT) mice subjected to the two-kidney one-clip model of hypertension. In contrast, the levels of COX-2 expression were only increased in the hypoperfused kidney of Cx40–/– mice. Treatment with indomethacin lowered blood pressure and renin mRNA in Cx40–/– mice without affecting renin levels, indicating that changes in COX-2 do not cause the altered secretion of renin. Suppression of NOS activity by NG-nitro-L-arginine methyl ester (L-NAME) decreased renin levels in Cx40–/– animals, indicating that NO regulates renin expression in the absence of Cx40. Treatment with candesartan normalized blood pressure in Cx40–/– mice, and decreased the levels of both COX-2 and nNOS. After a treatment combining candesartan and L-NAME, the blood pressure of Cx40–/– mice was higher than that of WT mice, showing that NO may counterbalance the vasoconstrictor effects of angiotensin II in Cx40–/– mice. These data document that renal COX-2 and nNOS are differentially regulated due to the elevation of renin-dependent blood pressure in mice lacking Cx40." @default.
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- W1987344408 date "2009-01-01" @default.
- W1987344408 modified "2023-10-18" @default.
- W1987344408 title "Increased Expression of Renal Cyclooxygenase-2 and Neuronal Nitric Oxide Synthase in Hypertensive Cx40-Deficient Mice" @default.
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- W1987344408 doi "https://doi.org/10.1159/000156704" @default.
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