Abstract
1. The effects of viprostol, prostaglandin E2 (PGE2) and nitroglycerin were studied in basilar artery, small mesenteric artery and the vein parallel to it as well as thoracic aorta of the rat. 2. In KCl-contracted basilar artery, viprostol produced a concentration-related biphasic response, contraction at concentrations less than 3 X 10(-6) M and relaxation at concentrations greater than 3 X 10(-6) M. PGE2 produced a concentration-related contraction while nitroglycerin produced a concentration-related relaxation. 3. In KCl-contracted small mesenteric artery, viprostol produced a biphasic response which was similar to that in the basilar artery. PGE2 produced a contraction and nitroglycerin produced relaxation in a concentration-dependent manner. 4. In KCl-contracted small mesenteric vein, in contrast to basilar and mesenteric artery, viprostol produced only a concentration-related relaxation in the range of 1 X 10(-6) to 1 X 10(-4) M. PGE2 produced a contraction and nitroglycerin produced a concentration-related relaxation. 5. In KCl-contracted thoracic aorta, PGE2 produced a biphasic response, relaxation at concentrations less than 3 X 10(-7) M and a concentration-related contraction at concentrations greater than 3 X 10(-7) M. Viprostol only produced a concentration-related contraction at concentrations greater than 1 X 10(-6) M, which was significantly less in magnitude than the contraction produced by PGE2. Nitroglycerin produced a concentration-related relaxation as seen in the small vessels. 6. In conclusion, the present data demonstrate that viprostol is a vasorelaxant agent which effectively dilates KCl-contracted basilar, small mesenteric artery and vein, but not the thoracic aorta of rat.(ABSTRACT TRUNCATED AT 250 WORDS)
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Selected References
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- Cervoni P., Chan P. S., Lai F. M., Birnbaum J. E. CL 115,347 (DHV-PGE2 ME): a new orally and topically active prostaglandin antihypertensive agent. Fed Proc. 1983 Feb;42(2):157–161. [PubMed] [Google Scholar]
- Högestätt E. D., Andersson K. E., Edvinsson L. Mechanical properties of rat cerebral arteries as studied by a sensitive device for recording of mechanical activity in isolated small blood vessels. Acta Physiol Scand. 1983 Jan;117(1):49–61. doi: 10.1111/j.1748-1716.1983.tb07178.x. [DOI] [PubMed] [Google Scholar]
- Levy J. V. Studies on the contractile effects of prostaglandins on aortic strip preparations from spontaneously hypertensive rats. Res Commun Chem Pathol Pharmacol. 1973 Sep;6(2):365–381. [PubMed] [Google Scholar]
- Strong C. G., Bohr D. F. Effects of prostaglandins E1, E2, A1, and F1-alpha on isolated vascular smooth muscle. Am J Physiol. 1967 Sep;213(3):725–733. doi: 10.1152/ajplegacy.1967.213.3.725. [DOI] [PubMed] [Google Scholar]
- Tsukada T., Rubio R., Berne R. M. Pharmacological differentiation between large and small coronary vessels. Arch Int Pharmacodyn Ther. 1984 Aug;270(2):255–267. [PubMed] [Google Scholar]