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• W2077837963 abstract "Aging is associated with erectile dysfunction (ED) attributed to reduced nitric oxide synthase (NOS) activity and nitric oxide bioavailability. However, the mechanism for this effect has not been fully investigated. We evaluated (i) whether age-related ED involves dysregulation of endothelial NOS (eNOS) phosphorylation; and (ii) whether vascular endothelial growth factor (VEGF) exerts erectile effects and operates via eNOS phosphorylation in aged rats.Male Fischer 344 young (4-month-old) and aged (19-month-old) rats were used. Electrical stimulation of the cavernous nerve (CNS) was performed to generate penile erection. Erectile response in the presence of rhVEGF165 was evaluated by intracavernosal pressure monitoring 25 minutes after intracavernosal injection of VEGF. Penes were excised at baseline, with or without rhVEGF treatment, and after CNS for Western immunoblot of phospho-eNOS (Ser-1177 and Thr-495), phospho-Akt, and eNOS.Erectile response was significantly reduced in aged rats compared with young rats. Phospho-eNOS (Ser-1177) and phospho-Akt were significantly reduced, while phospho-eNOS (Thr-495) was significantly increased, in the aged penis at baseline and after CNS. rhVEGF significantly improved erection and reversed downregulated Ser-1177, but not upregulated Thr-495 phosphorylation, on eNOS in aged penes. eNOS protein was significantly increased in aged penes.Age-related ED is associated with eNOS inactivation through a decrease in phosphorylation of its positive regulatory site (Ser-1177) and an increase in phosphorylation of its negative regulatory site (Thr-495) in the penis. Altered phosphorylation/constitutive activation of eNOS by fluid shear stress may be a major determinant of compromised vascular homeostasis of the aged penis. The finding that VEGF rapidly induces erection and partly corrects alterations in eNOS phosphorylation in the aged rat penis suggests impaired eNOS activation by deficient endogenous VEGF and supports the potential for growth factor therapy in the treatment of age-related ED." @default.
• W2077837963 created "2016-06-24" @default.
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• W2077837963 date "2005-05-01" @default.
• W2077837963 modified "2023-09-29" @default.
• W2077837963 title "Age‐Related Changes in Phosphorylation of Endothelial Nitric Oxide Synthase in the Rat Penis" @default.
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• W2077837963 doi "https://doi.org/10.1111/j.1743-6109.2005.20349.x" @default.
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