title: Efficacy of DA-8159, a new PDE5 inhibitor, for inducing penile erection in rabbits with acute spinal cord injury.
abstract: DA-8159 is a pyrazolopyrimidinone derivative which exhibits potent and selective phosphodiesterase type 5 (PDE5) inhibition. The aim of this study was to investigate the effects of DA-8159 on inducing a penile erection in rabbits with an acute spinal cord injury (ASCI). DA-8159 was given either orally (1, 3, or 10 mg/kg) or intravenously (0.1 or 0.3 mg/kg) to conscious male albino rabbits with a surgical transection of the spinal cord at the L2-L4 lumbar vertebra or ischemic-reperfusion SCI rabbits. Erection was evaluated in a time-course manner by measuring the length of the uncovered penile mucosa. DA-8159 induced a dose-dependent erection in both transection and ischemic-reperfusion ASCI rabbits. The efficacy of DA-8159 was potentiated by an intravenous injection of sodium nitroprusside, a nitric oxide donor. Potentiation of the effect by nitric oxide donor implies that DA-8159 can enhance the erectile activity during sexual arousal. These results suggest that DA-8159 may be useful for treating erectile dysfunction in patients with an SCI.
authors.affiliation: Department of Veterinary Public Health, College of Veterinary Medicine, Seoul National University, Seoul, Korea.
authors.forename: B O
authors.initials: BO
authors.lastname: Ahn
authors.forename: K K
authors.initials: KK
authors.lastname: Kang
authors.forename: G J
authors.initials: GJ
authors.lastname: Ahn
authors.forename: J W
authors.initials: JW
authors.lastname: Kwon
authors.forename: W B
authors.initials: WB
authors.lastname: Kim
authors.forename: K-S
authors.initials: KS
authors.lastname: Kang
authors.forename: Y-S
authors.initials: YS
authors.lastname: Lee
mesh_terms: D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000037:antagonists & inhibitors*; D000208:Acute Disease; D000818:Animals; D019540:Area Under Curve; D054706:Cyclic Nucleotide Phosphodiesterases, Type 5; D004195:Disease Models, Animal; D007172:Erectile Dysfunction / Q000188:drug therapy* / Q000209:etiology; D008297:Male; D010410:Penile Erection / Q000187:drug effects* / Q000502:physiology; D011743:Pyrimidines / Q000494:pharmacology*; D011817:Rabbits; D015427:Reperfusion Injury / Q000188:drug therapy; D013116:Spinal Cord / Q000473:pathology; D013119:Spinal Cord Injuries / Q000150:complications* / Q000473:pathology; D013449:Sulfonamides; D000096926:Benzenesulfonamides
chemical_list: D015106:3',5'-Cyclic-GMP Phosphodiesterases; D054706:Cyclic Nucleotide Phosphodiesterases, Type 5; D011743:Pyrimidines; D013449:Sulfonamides; C419664:udenafil; D000096926:Benzenesulfonamides