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  • Title: Immunohistochemical demonstration of relaxin in the genital tract of pregnant and nonpregnant women.
    Author: Yki-Järvinen H, Wahlström T, Seppälä M.
    Journal: J Clin Endocrinol Metab; 1983 Sep; 57(3):451-4. PubMed ID: 6348059.
    Abstract:
    The biotin-avidin immunoperoxidase staining method and antisera against highly purified porcine relaxin were used to localize relaxin in the genital tract of pregnant and nonpregnant women. Formalin-fixed tissue specimens from normal placenta, decidua, myometrium, vagina, corpus luteum, and Fallopian tubes were studied. In pregnant women, relaxin was found in the placental syncytiotrophoblast, decidua, and corpus luteum. In nonpregnant women, relaxin was identified in the corpus luteum and endometrium in the secretory, but not in the proliferative, phase. Myometrium, cervix, vagina, and Fallopian tubes were negative for relaxin. This is the first report describing relaxin in the nonpregnant corpus luteum, and we also confirm results of an early disputed study claiming that endometrium in the secretory phase contains relaxin. The origin and biological role of human endometrial relaxin remain to be studied.
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