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  • Title: Expression of prolactin and its receptor in the baboon uterus during the menstrual cycle and pregnancy.
    Author: Frasor J, Gaspar CA, Donnelly KM, Gibori G, Fazleabas AT.
    Journal: J Clin Endocrinol Metab; 1999 Sep; 84(9):3344-50. PubMed ID: 10487709.
    Abstract:
    PRL is known to be a major secretory product of the human decidua. However, the physiological role of decidual PRL during the menstrual cycle and pregnancy has not been fully defined, primarily due to the lack of an appropriate nonhuman primate model for in vivo studies. Therefore, this initial study examined the expression of PRL and its receptor in the baboon uterus during the cycle and pregnancy. PRL and PRL receptor messenger ribonucleic acid expression were detected by semiquantitative RT-PCR, and protein was localized by immunocytochemistry. PRL was shown to be expressed in myometrial smooth muscle during the follicular phase by both RT-PCR and immunocytochemistry. Expression of PRL messenger ribonucleic acid and protein was first observed in the epithelial cells of the deep basal glands during the late luteal phase. With the onset of pregnancy, PRL expression increased steadily and was evident primarily in the decidual tissue. In contrast to PRL, its receptor was expressed at constant levels in both the myometrium and endometrium during the cycle. An increase in receptor expression was evident in both the decidua and placenta throughout pregnancy. In summary, these results demonstrate that the baboon uterus is a site of both PRL production and action during the cycle and pregnancy. These studies establish the baboon as a nonhuman primate model to investigate the potential roles of PRL in implantation and maintenance of pregnancy.
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