Investigation of the mechanism of decreased sensitivity of the rat seminal vesicle to norepinephrine by lithium.
Li+ is reported to reduce sensitivity of alpha-adrenergic receptors to NE. The present investigation was designed to investigate the mechanism of this decreased sensitivity on the rat isolated seminal vesicle. In innervated preparations, 1.35 X 10(-3) M Li+ (i) shifted the concentration-response curves of NE, methoxamine, ACh and BaCl2 to the right and reduced their maximum responses; (ii) antagonized the leftward shift and the enhancement of maximum responses to NE by cocaine (2.9 X 10(-4) M), and (iii) reduced only the maximum responses to KCl. In denervated preparations, 1.35 X 10 (-3) M Li+ shifted the concentration response curve of NE to the left without any change in the maximum responses. The antagonistic effects of Li+ on maximal responses to NE, ACh and KCl observed in innervated preparations were significantly increased in Ca++-free medium. Li+ (1.35 X 10(-3) M) increased NE uptake by the seminal vesicle significantly. It is concluded that decreased sensitivity of the seminal vesicle to NE by Li+ could be due to an increase in the uptake of NE and to a nonspecific postsynaptic spasmolytic action.
D000109:Acetylcholine / Q000037:antagonists & inhibitors; D000818:Animals; D001464:Barium / Q000037:antagonists & inhibitors; D002118:Calcium / Q000494:pharmacology; D003714:Denervation; D004305:Dose-Response Relationship, Drug; D008094:Lithium / Q000378:metabolism / Q000494:pharmacology*; D008297:Male; D008729:Methoxamine / Q000037:antagonists & inhibitors; D009638:Norepinephrine / Q000037:antagonists & inhibitors* / Q000378:metabolism; D051381:Rats; D011942:Receptors, Adrenergic, alpha / Q000187:drug effects; D012669:Seminal Vesicles / Q000294:innervation* / Q000378:metabolism; D012965:Sodium Chloride / Q000037:antagonists & inhibitors
D011942:Receptors, Adrenergic, alpha; D001464:Barium; D012965:Sodium Chloride; D008094:Lithium; D008729:Methoxamine; D000109:Acetylcholine; D002118:Calcium; D009638:Norepinephrine