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  • Title: The effect of vasoactive intestinal polypeptide (VIP) on the canine gallbladder motility.
    Author: Kalfin R, Milenov K.
    Journal: Comp Biochem Physiol C Comp Pharmacol Toxicol; 1991; 100(3):513-7. PubMed ID: 1687549.
    Abstract:
    1. VIP at doses of 10(-9) to 10(-8) M was ineffective and at doses of 5 x 10(-8) to 10(-7) M exerted a slight inhibitory effect on the tone of the canine gallbladder muscle strip. However, VIP (0.1-1 micrograms/kg) injected intravenously (i.v.) in conscious dogs dose-dependently decreased the gallbladder pressure. 2. VIP did not influence significantly the acetylcholine (ACh)- or carbachol- induced contractions of canine gallbladder under in vitro or in vivo conditions, but it decreased the electrically-induced, atropine-sensitive contractions of gallbladder muscle strips. 3. VIP (5 x 10(-9) to 5 x 10(-8) M) did not influence significantly the dose-response curve for cholecystokinin octapeptide (CCK OP) of canine and guinea-pig gallbladder muscle strips. VIP injected i.v. (0.1-0.5 micrograms/kg) in conscious dogs greatly decreased the CCK OP-induced gallbladder pressure.
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