Rho/rho-kinase signalling in chronically alcohol-fed mice

• Published in: Turkish journal of medical sciences Vol. 47; no. 2; pp. 668 - 674
• Main Authors: Kubat, Havva, Yurtsever, Ahmet Sencer, Büyükafşar, Kansu
• Format: Journal Article
• Language: English
• Published: Turkey 01-01-2017
• Subjects: Alcoholism; Animals; Disease Models, Animal; Ethanol - pharmacology; Male; Mice; Mice, Inbred BALB C; Muscle, Smooth - drug effects; Penile Erection - drug effects; Penis - chemistry; Penis - drug effects; Penis - metabolism; Penis - physiology; rho GTP-Binding Proteins - metabolism; rho-Associated Kinases - metabolism; Signal Transduction - drug effects; Vasoconstrictor Agents - pharmacology; Vasodilator Agents - pharmacology
• ISSN: 1300-0144; 1303-6165
• DOI: 10.3906/sag-1512-161

The effects of chronic ethanol consumption on male sexual function are debateable, and its effects on the Rho/Rho-kinase pathway are unknown. Therefore, we investigated smooth muscle reactivity and Rho/Rho-kinase signalling in the corpus cavernosum of ethanol-fed mice.
Ethanol was added to drinking water at 5% concentration in the first 2 days with 5% increment every subsequent 2 days, up to a final concentration of 20% for 45 days. Corpora cavernosa were isolated and a cumulative dose-response curve to phenylephrine was obtained. Acetylcholine (10-6 M), electrical field stimulation (EFS, 40 V, 8-16 Hz) and Y-27632 (10
-10
M)-induced relaxations were compared in the control and ethanol groups.
Blood ethanol levels in the control and ethanol-treated mice were 1.5 ± 0.3 mg/dL and 37.4 ± 4.1 mg/dL (P < 0.001), respectively. Phenylephrine-induced contractile responses were potentiated in the ethanol group, with pD
values of 4.92 ± 0.18 and 5.71 ± 0.21 (P < 0.01) in the corpus cavernosum obtained from control and alcohol-fed mice, respectively. The relaxant responses to acetylcholine and EFS, but not Y-27632, were significantly augmented in the corpus cavernosum obtained from ethanol-treated mice. However, expression and activation of Rho-kinase remained unchanged in the alcohol group.
Ethanol drinking may increase sensitivity to both vasoconstrictors and vasodilators in the mouse corpus cavernosum without any alteration in Rho/Rho-kinase signalling.