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The Journal of Clinical Endocrinology & Metabolism Vol. 82, No. 7 2192-2197
Copyright © 1997 by The Endocrine Society

Experimental Studies

Epidermal Growth Factor and Sex Steroids Dynamically Regulate a Marker of Endometrial Receptivity in Ishikawa Cells1

Stephen G. Somkuti2, Lingwen Yuan, Marc A. Fritz and Bruce A. Lessey

Department of Obstetrics and Gynecology, Division of Human Reproduction and Infertility, University of North Carolina, Chapel Hill, North Carolina 27599-7570

Address all correspondence and requests for reprints to: Dr. Bruce A. Lessey, Department of Obstetrics and Gynecology, CB #7570, Old Clinic Building, University of North Carolina, Chapel Hill, North Carolina 27599-7570.

The factors regulating human endometrial receptivity remain poorly understood. The {alpha}vß3 integrin cell adhesion molecule appears to be regulated in the human endometrium, appearing on postovulatory days 5–6, corresponding to the time of initial embryo attachment. This integrin has been extensively studied as a potential marker of endometrial receptivity and is aberrantly expressed in the endometrial epithelium of some infertile women. Ishikawa cells are a well differentiated endometrial adenocarcinoma cell line that maintain functional estrogen and progesterone receptors and are a useful model to study steroid-mediated events in human endometrial epithelium. This cell line expresses most of the normal endometrial epithelial integrins, including the {alpha}vß3 vitronectin receptor. The regulation of this integrin was studied with fluorescence immunocytochemistry, flow cytometry, and Northern blot analysis. Estrogen with or without progesterone treatment down-regulates {alpha}vß3 in this cell line. Several growth factors, including epidermal growth factor and the closely related transforming growth factor-{alpha} significantly increase the expression of this integrin. We conclude that endometrial differentiation is influenced by both steroid hormones and growth factors. The {alpha}vß3 integrin appears to be an excellent marker to study the molecular events leading to the establishment of uterine receptivity and successful implantation.




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