[Relaxant effect of ethanol on isolated rabbit corpus cavernosum and its mechanism].
OBJECTIVE
To study the relaxant effect of ethanol on the isolated rabbit corpus cavernosum and its possible mechanism.


METHODS
The tension of isolated smooth muscle strips was recorded by the platform physiological graphed, and the concentrations of cAMP and cGMP in the rabbit corpus cavernosum were measured by 125I radioimmunoassay.


RESULTS
The 1.25% (V/V) ethanol significantly augmented the corporal relaxation induced by isoprenaline (10(-9) - 10(-5) mol/L). Ethanol-induced relaxation was inhibited by 100 micromol/L and 300 micromol/L SQ22536 (an adenylate cyclase inhibitor). Emax was depressed from (105.12 +/- 3.39) % to (97.00 +/- 2.57) % in the presence of 100 micromol/L SQ22536 or (91.09 +/- 2.42) % in the presence of 300 micromol/L SQ22536. EC50 was increased from (1.18 +/- 0.09)% (V/V) to (1.36 +/- 0.10) % in the presence of 100 micromol/L SQ22536 (P < 0.05) or (1.68 +/- 0.13) % (in the presence of 300 micromol/L SQ22536) (P < 0.05) respectively. Ethanol significantly elevated the level of cAMP but not that of cGMP in the isolated rabbit corpus cavernosum, and it also significantly enhanced the activity of the adenylate cyclase (AC) extracted from the rabbit corpus cavernosum in a dose-dependent manner.


CONCLUSIONS
Ethanol has a relaxant effect on the isolated rabbit corpus cavernosum, which may be associated with the cAMP signaling pathway.
Yang
Liu
L
Department of Pharmacology, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, Hubei 430030, China.
Tang
Qiang
Q
Hu
Ben-Rong
BR
Xiang
Ji-Zhou
JZ
D000818:Animals; D002492:Central Nervous System Depressants / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism; D000431:Ethanol / Q000494:pharmacology*; D066298:In Vitro Techniques; D008297:Male; D009126:Muscle Relaxation / Q000187:drug effects*; D010410:Penile Erection / Q000187:drug effects / Q000502:physiology; D010413:Penis / Q000187:drug effects* / Q000502:physiology; D011817:Rabbits; D015398:Signal Transduction / Q000187:drug effects
D002492:Central Nervous System Depressants; D000431:Ethanol; D000242:Cyclic AMP