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Localization and Temporal Expression of Prolactin Receptor in Human Endometrium

Department of Obstetrics and Gynecology, University of Edinburgh, and the Medical Research Council Reproductive Biology Unit, Center for Reproductive Biology (J.B., H.N.J., A.S.M.), Edinburgh, Scotland EH3 9EW

Address all correspondence and requests for reprints to: Dr. Rebecca L. Jones, Department of Obstetrics and Gynecology, Center for Reproductive Biology, 37 Chalmers Street, Edinburgh, Scotland EH3 9EW.

Extrapituitary PRL is synthesized by the decidualized endometrial stromal cells from the mid to late secretory phase in the nonpregnant cycle and throughout pregnancy. The function of PRL in the uterus is unknown, but the temporal expression indicates a role in implantation and placentation. PRL is a powerful immunoregulatory agent, and thus, a role in modulating endometrial leukocytes may be envisaged. To investigate the site of action of PRL, immunohistochemistry was conducted to localize the PRL receptor (PRL-R). In addition, ribonucleic acid was extracted and reverse transcriptase-PCR for PRL-R was conducted. PRL-R protein was immunolocalized to the glandular epithelium and a subset of stromal cells from the mid to late secretory phase of the menstrual cycle and in early decidua. PRL-R transcripts were also detected from the late secretory phase and first trimester decidua. These findings indicate that the receptor is expressed in a temporal pattern similar to that of PRL. PRL-R expression in the glandular epithelium is consistent with a role in regulating glandular activity. Furthermore, immunoreactivity for PRL-R in a subset of stromal cells may be evidence for paracrine interactions between decidualized cells or an immunoregulatory role for PRL.

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