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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effects of the new thromboxane A2 antagonist vapiprost on isolated canine blood vessels.

Effects of the new thromboxane A2 antagonist vapiprost (SN-309, GR-32191B, CAS 85505-64-2) on isolated canine blood vessels were investigated. U46619 ((15S)-hydroxy-11a, 9a-(epoxymethano) prosta-5Z, 13E-dienoic acid) 10(-10)-10(-6) mol/l, a thromboxane A2 analogue, produced concentration-dependent contractions of oblong or ring preparations isolated from basilar, coronary, mesenteric and femoral arteries. Vapiprost 10(-8) and 10(-7) mol/l significantly and concentration-dependently shifted the concentration-contraction curves for U46619 of these arteries to the right. The pA2 values were 8.80 +/- 0.09 in basilar arteries, 8.67 +/- 0.12 in coronary arteries, 8.86 +/- 0.05 in mesenteric arteries and 9.01 +/- 0.07 in femoral arteries. On the other hand, oblong or ring preparations of basilar, coronary, mesenteric and femoral arteries showed sustained contractile responses to KCl 3 x 10(-2) mol/l, U46619 10(-7) mol/l or prostaglandin (PG) F2 alpha 10(-5) mol/l. Norepinephrine (NE) 3 x 10(-5) mol/l also produced sustained contractions in mesenteric and femoral arterial preparations, but not in basilar and coronary arterial preparations. Vapiprost 10(-10)-3 x 10(-6) mol/l relaxed these four arterial preparations constricted with U46619 10(-7) mol/l and PGF 2 alpha 10(-5) mol/l in a concentration-dependent fashion, but hardly affected them constricted with KCl 3 x 10(-2) mol/l. NE 3 x 10(-5) mol/l-induced contractures of mesenteric and femoral arterial preparations were not influenced by any concentrations of vapiprost. Results indicate that vapiprost has an antagonistic action on a so-called TP-receptor and/or a vasoconstrictive prostaglandin(s)-receptor and thus produces vasorelaxation.[1]


  1. Effects of the new thromboxane A2 antagonist vapiprost on isolated canine blood vessels. Matsuzaki, T., Noguchi, K., Nakasone, J., Uezu, K., Higuchi, M., Sakanashi, M. Arzneimittel-Forschung. (1992) [Pubmed]
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