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Journal of Pharmacology and Experimental Therapeutics

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Abstract

Relationship of serotonin-3 receptor antagonist activity to gastric emptying and motor-stimulating actions of prokinetic drugs in dogs.

G W Gullikson, R F Loeffler and M A Viriña
Journal of Pharmacology and Experimental Therapeutics July 1991, 258 (1) 103-110;
G W Gullikson
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R F Loeffler
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M A Viriña
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Abstract

Drugs that enhance gastrointestinal motility include the benzamide drugs metoclopramide, cisapride and renzapride (BRL-24924). Because these agents also are serotonin-3 (5-HT3) receptor antagonists, which can promote gastric emptying in some species, the motor-stimulating properties of benzamide agents may be due to this mechanism. Metoclopramide (0.3-3.0 mg/kg i.v.), cisapride (0.03-1.0 mg/kg i.v.) and BRL-24924 (0.01-0.1 mg/kg i.v.) were evaluated for their relative motility-stimulating and 5-HT3 receptor antagonist activities in conscious dogs and were compared with selective 5-HT3 antagonist antiemetic compounds ICS-205-930, (3 alpha-tropanyl)1-H-indole-3-carboxylic acid ester and granisetron (BRL-43694). Gastric antral contractions and intestinal myoelectric motility were determined in response to drugs, as were their effects on solid and liquid emptying in a gamma scintigraphic model of gastroparesis. 5-HT3 receptor antagonist potency was examined by deriving ED50 values for inhibition of cisplatin emesis. All drugs were 5-HT3 antagonists as they blocked cisplatin emesis with relative potencies of BRL-43694 = ICS-205-930 greater than BRL-24924 greater than cisapride = metoclopramide. The order of potency for stimulating fasted dog antral contractile activity, however, was BRL-24924 = cisapride greater than metoclopramide greater than ICS-205-930 = BRL-43694. Maximally effective doses of BRL-24924 (0.1 mg/kg i.v.) and cisapride (0.67 mg/kg i.v.) in the antrum also stimulated intestinal myoelectrical activity, whereas ICS-205-930 (0.5 and 2.0 mg/kg i.v.) was not active.(ABSTRACT TRUNCATED AT 250 WORDS)

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Journal of Pharmacology and Experimental Therapeutics
Vol. 258, Issue 1
1 Jul 1991
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Abstract

Relationship of serotonin-3 receptor antagonist activity to gastric emptying and motor-stimulating actions of prokinetic drugs in dogs.

G W Gullikson, R F Loeffler and M A Viriña
Journal of Pharmacology and Experimental Therapeutics July 1, 1991, 258 (1) 103-110;

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Abstract

Relationship of serotonin-3 receptor antagonist activity to gastric emptying and motor-stimulating actions of prokinetic drugs in dogs.

G W Gullikson, R F Loeffler and M A Viriña
Journal of Pharmacology and Experimental Therapeutics July 1, 1991, 258 (1) 103-110;
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