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• W2024142910 abstract "This study is aimed to explore whether gender plays a role in the generation of nitric oxide (NO) and superoxide anion (O(2)(-)) in microvessels of hypertensive rats (SHR), as well as the potential mechanisms involved in these effects.NO generation in mesenteric arterioles was evaluated by measuring NO synthase (NOS) activity and protein expression. Oxidative stress was studied in vivo in mesenteric arterioles from male and female SHR by hydroethidine microfluorography. Although we did not observe any sex-related differences in NO generation, we found that hydroethitine oxidation is markedly increased (30.9+/-2.4%) in male compared to female (12.3+/-2.5%; p<0.05), demonstrating a gender difference in O(2)(-) production. The treatment of mesenteries with DPI (NAD(P)H-oxidase inhibitor) and treatment of SHR with losartan [Angiotensin-II type 1 (AT-1) receptor antagonist] markedly reduced O(2)(-) production in male, while produced a minor effect in female, suggesting that overexpression/activity of AT-1 receptor and NAD(P)H-oxidase contribute for the sexual dimorphism in superoxide generation. Immunoblot analyses provide evidences of overexpression of the NAD(P)H-oxidase components p22(phox), gp91(phox), p47(phox) and p67(phox) in arterioles from male in comparison to female. Losartan treatment inhibited the overexpression of these subunits in male, without affecting the responses in female.Taken together, our findings demonstrate that male SHR presents higher superoxide anion concentration under basal condition than does female. An AT-1-dependent overexpression of the NAD(P)H-oxidase components may account for the sexual dimorphism in oxidative stress, and may play an important role in the noted gender differences on incidence of cardiovascular disease." @default.
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• W2024142910 date "2004-01-01" @default.
• W2024142910 modified "2023-10-18" @default.
• W2024142910 title "Gender differences in superoxide generation in microvessels of hypertensive rats: role of NAD(P)H-oxidase" @default.
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• W2024142910 doi "https://doi.org/10.1016/j.cardiores.2003.10.010" @default.
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