Y-27632 improves the erectile dysfunction with ageing in SD rats through adjusting the imbalance between nNo and the Rho-kinase pathways.
We investigated whether the effect of Y-27632 to improve the erectile function in SD rats was associated with the degree of the imbalance between nNOS and the Rho-kinase pathways. Western blot analysis was used to evaluate nNOS and Rho-kinase protein expression in 10 young and 10 old SD rats. Imbalance value between nNOS and Rho-kinase protein levels was obtained by subtracting nNOS from Rho-kinase. A 5-V stimulus was given in SD rats before and after the administration of 200 nmol kg(-1) of Y-27632 intracavernosally and ICP/MAP was recorded. The improvement of erectile function induced by Y-27632 was expressed as the margin of ICP/MAP after and before the administration of Y-27632. In young rat group, the contents of nNOS and Rho-kinase protein were 1.7 +/- 0.15 and 1.8 +/- 0.14 respectively. In old rat group, the nNOS protein decreased to 1 +/- 0.15, and in contrast, the Rho-kinase protein increased to 2.6 +/- 0.2. The imbalance value between nNOS and Rho-kinase was 0.2986 +/- 0.1109 and 1.5961 +/- 0.1206 in young and old rat groups. The improvement of erectile function induced by Y-27632 was 0.0500 +/- 0.0294 and 0.3420 +/- 0.660 in young and old rat groups. In all rats, the correlation coefficient between the imbalance value of nNOS and Rho-kinase and the improvement of erectile function was 0.649, P < 0.01. In conclusion, this study suggested that impaired erectile function with ageing in SD rats be associated with the imbalance between nNO and Rho-kinase activity and Y-27632 could improve the erectile function in old SD rats through adjusting this imbalance.
Department of Urology, Second Hospital and Qilu Hospital, Shandong University School of Medicine, Jinan, China.
B H
BH
Gao
S T
ST
Zhao
F W
FW
Meng
B K
BK
Shi
Y Q
YQ
Liu
Z S
ZS
Xu
D000375:Aging; D000577:Amides / Q000494:pharmacology*; D000818:Animals; D007172:Erectile Dysfunction / Q000188:drug therapy; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism*; D008297:Male; D008958:Models, Molecular; D052248:Nitric Oxide Synthase Type I / Q000378:metabolism*; D010410:Penile Erection / Q000187:drug effects*; D010413:Penis / Q000201:enzymology; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D011725:Pyridines / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D054460:rho-Associated Kinases
D000577:Amides; D047908:Intracellular Signaling Peptides and Proteins; D011725:Pyridines; C108830:Y 27632; D052248:Nitric Oxide Synthase Type I; D017346:Protein Serine-Threonine Kinases; D054460:rho-Associated Kinases