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- W1993505738 abstract "1. The effect of zeranol (3-100 microM) on rat uterus contractions induced by KCl (60 mM) and CaCl2 (30 microM-10 mM) has been assayed. 2. Zeranol relaxed the tonic contraction induced by KCl in a concentration-dependent manner (IC50 15.62 +/- 2.66 microM). CaCl2 (0.1-10 mM) did not counteract the relaxing effect of zeranol. 3. CaCl2 (30 microM -10 mM) produced a concentration-dependent contraction of rauuterus in medium lacking calcium plus KCl (60 mM) (EC50 0.34 +/- 0.03 mM). Zeranol (8 microM) displaced the CaCl2 concentration-response curve to the right and increased the EC50 to 1.27 +/- 0.57 mM (P < 0.05) without modifying the Emax. 4. The antiestrogen tamoxifen (1 microM) and the inhibitor of cAMP-dependent protein kinase TPCK (3 microM) did not modify the effect of zeranol. However, the inhibitors of transcription (actinomycin D, 4 microM), protein synthesis (cycloheximide, 100 microM), and ornithine-decarboxilase (alpha-difluoromethyl-ornithine, 10 mM)) antagonized the effect of zeranol, increasing the IC50 to 50.2 +/- 6.2 microM, 122 +/- 6.9 microM, and 23.51 +/- 1.14 microM, respectively. 5. Our results suggest that the relaxing effect of zeranol on rat uterus smooth muscle is produced by mechanisms unrelated to cAMP and estrogen receptors, but involves transcriptional effects and polyamine synthesis." @default.
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- W1993505738 date "1997-04-01" @default.
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- W1993505738 title "Transcriptional mechanisms involved in the relaxant effect of zeranol on isolated rat uterus" @default.
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- W1993505738 doi "https://doi.org/10.1016/s0306-3623(96)00282-0" @default.
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