title: Effect of testosterone and frequent low-dose sildenafil/tadalafil on cavernous tissue oxidative stress of aged diabetic rats.
abstract: This study aimed to assess the effect of testosterone (T) administration and chronic low-dose sildenafil/tadalafil on cavernous tissue oxidative stress (OS) of aged diabetic rats. In all, 140 Sprague-Dawley aged rats were subdivided into the following: controls; streptozotocin (STZ)-induced diabetic rats; diabetic rats injected with T every 4 weeks; diabetic rats on sildenafil orally daily; diabetic rats on T and daily sildenafil; diabetic rats on tadalafil orally every other day; diabetic rats on T and tadalafil; diabetic rats on alternate sildenafil/tadalafil; and diabetic rats on alternate sildenafil/tadalafil with T. After 12 weeks, the rats were euthanised where in dissected cavernous tissues malondialdehyde (MAD), glutathione peroxidase (GPx) and cGMP (cyclic guanosine monophosphate) were estimated. Compared with controls, aged diabetic rats demonstrated significant increase in cavernous tissue MDA and significant decrease in GPx and cGMP where diabetic rats injected with T had marked improvement of these parameters. Diabetic rats on sildenafil, tadalafil or alternate sildenafil/tadalafil demonstrated significant increased cavernous tissue GPx, cGMP and decreased cavernous MDA that was further improved when supplemented with T. It is concluded that frequent low-dose use of sildenafil and/or tadalafil supplemented with T has a marked impact on ameliorating cavernous OS in aged diabetic rats.
authors.affiliation: Department of Andrology and Sexology, Cairo University, Cairo, Egypt. taymour1155@link.net
authors.forename: T
authors.initials: T
authors.lastname: Mostafa
authors.forename: L
authors.initials: L
authors.lastname: Rashed
authors.forename: K
authors.initials: K
authors.lastname: Kotb
authors.forename: M
authors.initials: M
authors.lastname: Taymour
mesh_terms: D000375:Aging / Q000378:metabolism; D000818:Animals; D002243:Carbolines / Q000008:administration & dosage*; D006152:Cyclic GMP / Q000378:metabolism; D003921:Diabetes Mellitus, Experimental / Q000150:complications / Q000188:drug therapy / Q000378:metabolism*; D007172:Erectile Dysfunction / Q000188:drug therapy / Q000209:etiology / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects; D010410:Penile Erection / Q000187:drug effects; D010413:Penis / Q000187:drug effects* / Q000378:metabolism*; D010879:Piperazines / Q000008:administration & dosage*; D011687:Purines / Q000008:administration & dosage; D051381:Rats; D017207:Rats, Sprague-Dawley; D000068677:Sildenafil Citrate; D013450:Sulfones / Q000008:administration & dosage*; D000068581:Tadalafil; D013739:Testosterone / Q000008:administration & dosage*; D014665:Vasodilator Agents / Q000008:administration & dosage
chemical_list: D002243:Carbolines; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D013739:Testosterone; D008315:Malondialdehyde; D000068581:Tadalafil; D000068677:Sildenafil Citrate; D005979:Glutathione Peroxidase; D006152:Cyclic GMP