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Expression of Trophinin, Tastin, and Bystin by Trophoblast and Endometrial Cells in Human Placenta¹

^a The Burnham Institute, La Jolla, California 92037 ^b Central Clinical Laboratories, Shinshu University Hospital, Matsumoto, Japan ^c Department of Pathology, Johns Hopkins Hospital, Baltimore, Maryland 12187 ^d Department of Gynecology and Obstetrics, Keio University School of Medicine, Tokyo, Japan

Trophinin, tastin, and bystin comprise a complex mediating a unique homophilic cell adhesion between trophoblast and endometrial epithelial cells at their respective apical cell surfaces. In this study, we prepared mouse monoclonal antibodies specific to each of these molecules. The expression of these molecules in the human placenta was examined immunohistochemically using the antibodies. In placenta from the 6th week of pregnancy, trophinin and bystin were found in the cytoplasm of the syncytiotrophoblast in the chorionic villi, and in endometrial decidual cells at the utero placental interface. Tastin was exclusively present on the apical side of the syncytiotrophoblast. Tissue sections were also examined by in situ hybridization using RNA probes specific to each of these molecules. This analysis showed that trophoblast and endometrial epithelial cells at the utero placental interface express trophinin, tastin, and bystin. In wk 10 placenta, trophinin and bystin were found in the intravillous cytotrophoblast, while tastin was not found in the villi. After wk 10, levels of all three proteins decreased and then disappeared from placental villi.

¹ This study was supported by NIH RO1 HD34108, the Mizutani Foundation 960073, and Kyowa Medex.

² Correspondence: Michiko N. Fukuda, The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037. FAX: 619 646 3193; michiko{at}ljcrf.edu

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