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It has been demonstrated that human endometrial stromal cells (ESC) produce a variety of chemokines in vivo and in vitro. To evaluate the expression of epithelial neutrophil-activating peptide 78 (ENA-78) in the endometrium, concentrations of ENA-78 in cyclic endometrial tissues were measured using enzyme-linked immunosorbent assay. The expression of ENA-78 was also detected in cyclic endometrium by immunohistochemistry. Endometrial tissues in the secretory phase contained higher amounts of ENA-78 protein than did those in the proliferative phase. Immunofluorescence staining revealed that ENA-78 protein was localized mainly in the stroma of endometrium. In addition, to evaluate the involvement of inflammatory mediators and ovarian steroid hormones in the production of ENA-78 by ESC was evaluated by in-vitro studies. Unstimulated ESC constitutively secreted ENA-78. Progesterone, lipopolysaccharide, tumour necrosis factor-alpha, and interleukin-1beta significantly stimulated the expression of ENA-78 by ESC. It is suggested that the production of ENA-78 by ESC is regulated by progesterone as well as by the inflammatory mediators. The modulation of ENA-78 concentration in the local environment by these mediators may contribute to the normal and pathological processes of human reproduction through regulation of leukocyte trafficking into the endometrium.

Expression of epithelial neutrophil-activating peptide 78 in cultured human endometrial stromal cells