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Phasic contractions were evoked in Mg-free Krebs solution by electrical stimulation in the longitudinal myometrial strip taken from estrogen-treated rats, and the application of 30 microM dibutyryl cyclic AMP (db cAMP) for 15 min depressed the amplitude of contraction to 81 +/- 18% (+/- SD, n = 23) of the control. The contractile depression caused by db cAMP was not significantly altered by pretreatment with either 1 mM Mg (40 min) or 100 mU porcine relaxin (15 min) alone; however it was markedly enhanced to 22 +/- 30% (n = 7) of the control response by the combined pretreatment with Mg and relaxin. The enhancement lasted for longer than 2 h thereafter in Mg-free Krebs solution. It was discussed that some memory factor was induced by relaxin in the presence of 1 mM Mg to respond strongly to db cAMP.

the japanese journal of physiology

Pretreatment with Porcine Relaxin and Mg Ions Enhances Inhibitory Effects of Dibutyryl Cyclic AMP in Longitudinal Muscle of Estrogen-Treated Rat Myometrium.