Abstract
The effect of the synthetic estradiol, 17α-ethinylestradiol, and three progestogens on calcium influx was investigated in cell cultures of human aortic smooth muscle. Neither the synthetic estrogen nor the progestogens levonorgestrel, 3-keto-desogestrel, and gestodene showed, in the concentration range of 10 −9 to 10 −6 M, a significant effect on calcium influx both alone or in equimolar estrogen-gestagen combinations. The results indicate that these substances, commonly used in contraceptive pills, do not change vasotonus interfering with calcium homeostasis.
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