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Effects of Cilostazol on Human Venous Smooth Muscle

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Annals of Vascular Surgery

Abstract

In this study, we evaluated the effect of therapeutic doses of cilostazol on human venous smooth muscle. Saphenous vein rings (two to four per patient sample) were suspended in tissue baths for isometric tension recordings. At the beginning of the experiment, optimal tension for isometric contraction was achieved for each ring in a stepwise fashion in the presence of norepinephrine (10−2 M). Norepinepherine was then added cumulatively in half-molar increments and isometric tension developed by the rings was measured, thereby obtaining a dose-response curve. Following washout and reequilibration, the rings were precontracted with a 30-50% submaximal dose of norepinepherine determined from the dose-response curve and allowed to contract until a stable plateau was reached. Cilostazol was then added in a cumulative manner (680-2,720 μg/L), and the tension generated was recorded. A total of 76 venous rings were tested, and all relaxed in the presence of cilostazol. The amount of relaxation increased as the concentration of cilostazol increased. Relaxation of 15 ± 1.9% (mean ± SEM) at low cilostazol doses (680 μg/L) to 37±3% at high cilostazol doses (2,720 μg/L) was demonstrated. A second finding of this study was demonstrated when the patient samples were divided according to the presence or absence of risk factors for arteriosclerosis. The specific risk factors examined included diabetes mellitus, smoking, hypercholesterolemia, and hypertension. The presence or absence of hypertension (n = 52) or hypercholesterolemia (n = 18) did not affect the amount of relaxation of the venous rings. Smokers (n = 46) had less relaxation 16 ± 2.4% (680 μg/L) to 41 ± 3.6% (2,720 μg/L) compared to nonsmokers (n = 53) who relaxed 22 ± 3.5% (680 μg/L) to 48 ± 5.7% (2720 μg/L). This did not reach statistical significance at any concentration cilostazol (p = 0.11-0.18). Diabetics (n = 53) did have statistically significantly less relaxation at every concentration of cilostazol compared to nondiabetics (n = 11, p < 0.05). All venous rings relaxed in the presence of cilostazol. Veins of nondiabetics relaxed statistically significantly more than those of diabetics. Smokers had less relaxation than non-smokers, but this was not statistically significant. We are the first to demonstrate that human venous smooth muscle cells undergo relaxation when exposed to therapeutic concentrations of cilostazol.

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Authors and Affiliations

  1. Vascular Surgery Department, Harper University Hospital, Wayne State University, Detroit, MI, USA

    Russell W. Becker DO, Eriks Lusis MD, Richard L. Sohn & Ronald A. Kline MD

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  1. Russell W. Becker DO
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  2. Eriks Lusis MD
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  3. Richard L. Sohn
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  4. Ronald A. Kline MD
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Correspondence to Russell W. Becker DO.

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Becker, R.W., Lusis, E., Sohn, R.L. et al. Effects of Cilostazol on Human Venous Smooth Muscle. Ann Vasc Surg 19, 393–397 (2005). https://doi.org/10.1007/s10016-005-0012-6

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