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Antiproliferative Effect of Interferon- in Human Endometrial Epithelial Cells in Vitro: Potential Local Growth Modulatory Role in Endometrium^*

Department of Pathology, City Hospital Center (S.S.T.) Elmhurst, New York 11373
Mount Sinai School of Medicine, City University of New York (S.S.T) New York, New York 11373
The Department of Obstetrics and Gynecohgy, Milton S. Hershey Medical Center, Pennsylvania State University (P.G.S.) Hershey, Pennsylvania, 17033
The Department of Medical Oncology, University of Texas, M. D. Anderson Hospital and Tumor Institute (P.N.R.) Houston, Texas 77030

Address all correspondence and requests for reprints to: S. S. Tabibzadeh, M.D., Department of Pathology, City Hospital Center, 79-01 Broadway, Elmhurst, New York 11373.

We previously reported that recombinant interferon- (IFN-) induces HLA-DR (human lymphocyte antigen) molecules of the major histocompatibility complex in human endometrial epithelial cells in vitro. We now report that IFN- inhibits the proliferation of human endometrial epithelial cells and a human endometrial carcinoma cell line (EnCalOlAE). Human endometrial epithelial cells expressed HLA-DR molecules and underwent morphological changes when exposed to IFN. Furthermore, the proliferation of these cells, as evidenced by nuclear labeling of bromodeoxyuridine (an analog of thymidine that is incorporated into cells in S phase), was markedly reduced, in a dose-dependent manner, by IFN-. IFN- induced HLA-DR expression, morphological changes, shedding from the substratum, and cell death in EnCalOlAE cells. In addition, cell number and the numbers of bromodeoxyuridine-, Ki-67 (a nuclear marker of proliferation)-, and MPM-2 (a marker of mitotic cells)-positive cells were markedly lower in the EnCalOlAE cultures treated with IFN- than those in control cultures. The cytostatic and HLA-DR-inducing effects of IFN- could be abrogated by neutralization with a polyclonal antibody, and IFN- 7 effects were reversible within days after its withdrawal. These findings indicate that IFN- inhibits proliferation of human endometrial epithelial cells and suggest that this factor may locally regulate the proliferation of these epithelial cells in vivo.

^* This work was supported in part by Grant P01-CA-40011.

Received December 1, 1987.

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