Functional and structural changes in internal pudendal arteries underlie erectile dysfunction induced by androgen deprivation

Carneiro, F. S., Alves-Lopes, R. , Neves, K. B. , Silva, M. A.B., Olivon, V. C., Ruginsk, S. G., Antunes-Rodrigues, J., Ramalho, L. N.Z. and Tostes, R. C. (2017) Functional and structural changes in internal pudendal arteries underlie erectile dysfunction induced by androgen deprivation. Asian Journal of Andrology, 19(5), pp. 526-532. (doi:10.4103/1008-682X.173935) (PMID:27391248) (PMCID:PMC5566844)

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Abstract

Androgen deficiency is strongly associated with erectile dysfunction (ED). Inadequate penile arterial blood flow is one of the major causes of ED. The blood flow to the corpus cavernosum is mainly derived from the internal pudendal arteries (IPAs); however, no study has evaluated the effects of androgen deprivation on IPA's function. We hypothesized that castration impairs IPAs reactivity and structure, contributing to ED. In our study, Wistar male rats, 8-week-old, were castrated and studied 30 days after orchiectomy. Functional and structural properties of rat IPAs were determined using wire and pressure myograph systems, respectively. Protein expression was determined by Western blot and immunohistochemistry. Plasma testosterone levels were determined using the IMMULITE 1000 Immunoassay System. Castrated rats exhibited impaired erectile function, represented by decreased intracavernosal pressure/mean arterial pressure ratio. IPAs from castrated rats exhibited decreased phenylephrine- and electrical field stimulation (EFS)-induced contraction and decreased acetylcholine- and EFS-induced vasodilatation. IPAs from castrated rats exhibited decreased internal diameter, external diameter, thickness of the arterial wall, and cross-sectional area. Castration decreased nNOS and α-actin expression and increased collagen expression, p38 (Thr180/Tyr182) phosphorylation, as well as caspase 3 cleavage. In conclusion, androgen deficiency is associated with impairment of IPA reactivity and structure and increased apoptosis signaling markers. Our findings suggest that androgen deficiency-induced vascular dysfunction is an event involving hypotrophic vascular remodeling of IPAs.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lopes, Dr Rheure and Neves, Dr Karla Bianca
Authors: Carneiro, F. S., Alves-Lopes, R., Neves, K. B., Silva, M. A.B., Olivon, V. C., Ruginsk, S. G., Antunes-Rodrigues, J., Ramalho, L. N.Z., and Tostes, R. C.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:Asian Journal of Andrology
Publisher:Medknow Publications
ISSN:1008-682X
ISSN (Online):1745-7262
Published Online:05 July 2016
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Asian Journal of Andrology 19(5):526-532
Publisher Policy:Reproduced under a Creative Commons License

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