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• W2040335051 abstract "Summary Erectile dysfunction (ED) is very prevalent in the older population, although the ageing‐related mechanisms involved in the development of ED are poorly understood. We propose that age‐induced differences in nerve‐ and endothelium‐mediated smooth muscle contractility in the corpus cavernosum (CC) could be found between a senescent‐accelerated mouse prone (SAMP8) and senescent‐accelerated mouse resistant (SAMR1) strains. We analysed the changes in muscle tension induced by electrical field stimulation (EFS) or agonist addition ‘in vitro’, assessing nerve density (adrenergic, cholinergic and nitrergic), the expression of endothelial nitric oxide synthase ( eNOS ), cGMP accumulation and the distribution of interstitial cells (ICs) by immunofluorescence. We observed no change in both the nerve‐dependent adrenergic excitatory contractility at physiological levels of stimulation and in the nitrergic inhibitory response in SAMP8 animals. Unlike cholinergic innervation, the density of adrenergic and nitrergic nerves increased in SAMP8 mice. In contrast, smooth muscle sensitivity to exogenous noradrenaline (NA) was slightly reduced, whereas cGMP accumulation in response to EFS and DEA/NO, and relaxations to DEA/NO and sildenafil, were not modified. No changes in the expression of eNOS and in the distribution of vimentin‐positive ICs were detected in the aged animals. The ACh induced atropine‐sensitive biphasic endothelium‐dependent responses involved relaxation at low concentrations that turned into contractions at the highest doses. CC relaxation was mainly because of the production of NO together with some relaxant prostanoid, which did not change in SAMP8 animals. In contrast, the contractile component was considerably higher in the aged animals and it was completely inhibited by indomethacin. In conclusion, a clear imbalance towards enhanced production of contractile prostanoids from the endothelium may contribute to ED in the elderly. On the basis of these data, we propose the senescence‐accelerated mouse model as a reliable tool to analyse the basic ageing mechanisms of the CC." @default.
• W2040335051 created "2016-06-24" @default.
• W2040335051 creator A5040052199 @default.
• W2040335051 creator A5045335274 @default.
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• W2040335051 date "2014-04-16" @default.
• W2040335051 modified "2023-10-06" @default.
• W2040335051 title "Changes in nerve- and endothelium-mediated contractile tone of the corpus cavernosum in a mouse model of pre-mature ageing" @default.
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• W2040335051 doi "https://doi.org/10.1111/j.2047-2927.2014.00213.x" @default.
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