title: Histopathological changes and nitric oxide synthase activity in corpus cavernosum from rats with neurogenic erectile dysfunction.
abstract: OBJECTIVE
  To investigate changes in histology and nitric oxide synthase (NOS) activity in cavernosal tissues from rats with neurogenic erectile dysfunction induced experimentally.
  
  
  METHODS
  Twenty-four adult male Sprague-Dawley rats were divided equally into three groups and underwent a sham operation (control, group 1), unilateral (group 2) or bilateral (group 3) cavernosal nerve resection. Three months later they were killed and the cavernosal tissues analysed histologically by light and transmission electron microscopy, with NOS activity detected using an NADPH-diaphorase staining technique.
  
  
  RESULTS
  On light and electron microscopy, while penile nerves and cavernosal smooth muscle cells had a normal morphological appearance in the eight control rats, there were degenerative changes of the myelinated penile nerves and axonal fibrosis in groups 2 and 3. However, these changes were not significant. Using NADPH-diaphorase staining, NOS activity was detected in all three groups in endothelial cells and cavernosal structures. However, the staining was more intense in endothelial cells and cavernosal muscles of rats in group 2 than in the other groups.
  
  
  CONCLUSIONS
  NOS activity was increased in the cavernosal tissue after cavernosal denervation, but the pharmacological action of nitric oxide may be impaired.
authors.affiliation: 1st Urology Clinic, Ankara Numune Hospital, Ankara.
authors.forename: M M
authors.initials: MM
authors.lastname: Basar
authors.forename: M
authors.initials: M
authors.lastname: Yildiz
authors.forename: F
authors.initials: F
authors.lastname: Söylemezoglu
authors.forename: H S
authors.initials: HS
authors.lastname: Sürücü
authors.forename: H
authors.initials: H
authors.lastname: Basar
authors.forename: H
authors.initials: H
authors.lastname: Akan
authors.forename: R
authors.initials: R
authors.lastname: Basar
mesh_terms: D000818:Animals; D007172:Erectile Dysfunction / Q000201:enzymology* / Q000473:pathology; D007150:Immunohistochemistry; D008297:Male; D019001:Nitric Oxide Synthase / Q000378:metabolism*; D010413:Penis / Q000201:enzymology* / Q000294:innervation / Q000473:pathology; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D019001:Nitric Oxide Synthase