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THE ACTION OF BRADYKININ AND OXYTOCIN ON THE ISOLATED WHOLE UTERUS AND MYOMETRIUM OF THE RAT IN OESTRUS
Author(s) -
WHALLEY E.T.
Publication year - 1978
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1978.tb08636.x
Subject(s) - bradykinin , oxytocin , myometrium , uterus , estrous cycle , endocrinology , medicine , chemistry , receptor
1 A technique is described for obtaining a myometrial preparation devoid of endometrium, from the uterus of the rat in oestrus. 2 Acetylcholine and prostaglandin F 2α (PGF 2α ) produced concentration‐effect curves with the same maximal tensions and slope on the whole uterus and myometrial preparations. Concentration‐effect curves to bradykinin and oxytocin on the myometrial preparation were altered, resulting in a shift to the right and a decreased maximum response compared with those produced by the whole uterus. 3 Indomethacin produced greater antagonism of the responses of the whole uterus to bradykinin and oxytocin than to acetylcholine and PGF 2at , whereas responses of the myometrium to all four agonists were similarly depressed. 4 Responses of the myometrial preparation to a range of concentrations of bradykinin and oxytocin were significantly enhanced by prior sensitization of the myometrium to PGF 2flt . This significant enhancing effect of PGF 2flt was only seen with the threshold dose of acetylcholine. 5 It appears that the mechanism of action of bradykinin and oxytocin on the rat uterus involves both a direct action and an indirect action. The indirect action possibly involves release of prostaglandins) from the endometrium.