Effects of avitriptan, a new 5-HT1B/1D receptor agonist, in experimental models predictive of antimigraine activity and coronary side-effect potential |
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Authors: | P R Saxena Peter De Vries W Wang Jan P C Heiligers Antoinette MaassenVanDenBrink Willem A Bax Frank D Yocca |
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Institution: | (1) Department of Pharmacology, Dutch Migraine Research Group and Cardiovascular Research Institute „COEUR”, Faculty of Medicine and Health Sciences, Erasmus University Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands, NL;(2) CNS Drug Discovery Division, Bristol-Myers Squibb Pharmaceutical Research Institute, Wallingford, Connecticut, USA, US |
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Abstract: | Several acutely acting antimigraine drugs, including ergotamine and sumatriptan, have the ability to constrict porcine arteriovenous
anastomoses as well as the human isolated coronary artery. These two experimental models seem to serve as indicators, respectively,
for the therapeutic and coronary side-effect potential of the compounds. Using these two models, we have now investigated
the effects of avitriptan (BMS-180048; 3-3-4-(5-methoxy-4-pyrimidinyl)-1-piperazinyl]propyl]-N-methyl-1H-indole-5-methanesulfonamide monofumarate), a new 5-HT1B/1D receptor agonist. In anaesthetized pigs, avitriptan (10, 30, 100 and 300 μg·kg–1) decreased the total carotid blood flow by exclusively decreasing arteriovenous anastomotic blood flow; capillary blood flow
was increased. The mean ± SEM i.v. dose of avitriptan eliciting a 50% decrease (ED50) in the porcine carotid arteriovenous anastomotic blood flow was calculated to be 76 ± 23 μg·kg–1 (132 ± 40 nmol·kg–1) and the highest dose (300 μg·kg–1) produced a 72 ± 4% reduction. In recent comparative experiments (DeVries et al. 1996), the mean ± SEM ED50 (i.v.) of sumatriptan in decreasing carotid arteriovenous anastomotic blood flow was 63 ± 17 μg·kg–1 (158 ± 43 nmol·kg–1), with a reduction of 76 ± 4% by 300 μg·kg–1, i.v. Both avitriptan (pD2: 7.39 ± 0.09; Emax: 13.0 ± 4.5% of the contraction to 100 mM K+) and sumatriptan (pD2: 6.33 ± 0.09; Emax: 15.5 ± 2.3% of the contraction to 100 mM K+) contracted the human isolated coronary artery. The above results suggest that avitriptan should be able to abort migraine
headaches in patients, but may exhibit sumatriptan-like effects on coronary arteries. Initial clinical studies have demonstrated
the therapeutic action of the drug in acute migraine.
Received: 23 August 1996 / Accepted: 19 October 1996 |
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Keywords: | Antimigraine drugs Arteriovenous anastomoses Avitriptan BMS-180048 Carotid artery Human Human coronary artery Migraine Pig Sumatriptan |
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