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• W2138769105 abstract "Introduction Diabetes‐induced erectile dysfunction involves elevated arginase (Arg) activity and expression. Because nitric oxide (NO) synthase and Arg share and compete for their substrate L‐arginine, NO production is likely linked to regulation of Arg. Arg is highly expressed and implicated in erectile dysfunction. Aim It was hypothesized that Arg‐II isoform deletion enhances relaxation function of corpora cavernosal (CC) smooth muscle in a streptozotocin (STZ) diabetic model. Methods Eight weeks after STZ‐induced diabetes, vascular functional studies, Arg activity assay, and protein expression levels of Arg and constitutive NOS (using Western blots) were assessed in CC tissues from nondiabetic wild type (WT), diabetic (D) WT (WT + D), Arg‐II knockout (KO), and Arg‐II KO+D mice (N = 8–10 per group). Main Outcome Measures Inhibition or lack of arginase results in facilitation of CC relaxation in diabetic CC. Results Strips of CC from Arg‐II KO mice exhibited an enhanced maximum endothelium‐dependent relaxation (from 70 + 3% to 84 + 4%) and increased nitrergic relaxation (by 55%, 71%, 42%, 42%, and 24% for 1, 2, 4, 8 and 16 Hz, respectively) compared with WT mice. WT + D mice showed a significant reduction of endothelium‐dependent maximum relaxation (44 + 8%), but this impairment of relaxation was significantly prevented in Arg‐II KO+D mice (69 + 4%). Sympathetic‐mediated and alpha‐adrenergic agent‐induced contractile responses also were increased in CC strips from D compared with non‐D controls. Contractile responses were significantly lower in Arg‐II KO control and D versus the WT groups. WT + D mice increased Arg activity (1.5‐fold) and Arg‐II protein expression and decreased total and phospho‐eNOS at Ser‐1177, and nNOS levels. These alterations were not seen in Arg‐II KO mice. Additionally, the Arg inhibitor BEC (50 µM) enhanced nitrergic and endothelium‐dependent relaxation in CC of WT + D mice. Conclusion These studies show for the first time that Arg‐II deletion improves CC relaxation in type 1 diabetes. Toque HA, Tostes RC, Yao L, Xu Z‐M, Webb RC, Caldwell RB, and Caldwell RW. Arginase II deletion increases corpora cavernosa relaxation in diabetic mice." @default.
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• W2138769105 date "2011-03-01" @default.
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• W2138769105 title "Arginase II Deletion Increases Corpora Cavernosa Relaxation in Diabetic Mice" @default.
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• W2138769105 doi "https://doi.org/10.1111/j.1743-6109.2010.02098.x" @default.
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