Effects of ovarian hormone tratment on Ca2+-induced contractions and Ca2+-antagonism in the depolarized rat myometrium
Acta physiol. pharmacol. ther. latinoam
;
46(1): 41-7, 1996. tab
Article
in English
| LILACS
| ID: lil-168105
RESUMO
The effects of estrogen (E), progesterone (P) and estrogen plus progesterone (E+P) treatment on Cainduced contraction in the KCL-depolarized uterine muscle, and the influences on the Ca2+ antagonism induced by reserpine and verapamil "in vivo" were studied. Uterine muscles from rats in estrus were taken as controls. Uteri from spayed untreated rats showed the same sensivity to Ca2+ as those from estrus rats, but castration decreased maximal contractile tension to Ca2+ and Ca2+ thereshold. P tratment failed to modified the effects of castration on the responses to Ca2+. E or E+P treatments decreased the sensitivity to Ca2+ but only E+P increased slope values and maximal contractile tension. E and E+P increased the potency of verapamil Ca2+ antagonism but none the treatments modified reserpine direct inhibitory effects. The results obtained suggest that alterations on uterine contractility by hormone treatment are the result of complex interactions between both genomic effects on the contractile process as well as nongenomic direct actions of the hormones on Ca2+ membrane permeability.
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LILACS (Americas)
Main subject:
Progesterone
/
Uterine Contraction
/
Calcium
/
Estradiol
/
Myometrium
Type of study:
Diagnostic study
Limits:
Animals
Language:
English
Journal:
Acta physiol. pharmacol. ther. latinoam
Journal subject:
Pharmacology
/
Physiology
/
Therapeutics
Year:
1996
Type:
Article
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