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Selected functions of uterine endometrium of ovulatory women before and during pregnancy appear to be modulated by cytokines and other paracrine-acting factors. Some of these functions are regulated, in turn, by cyclic changes in ovarian steroid secretion or by pregnancy-induced endocrine and paracrine factors. The recruitment of specific types and numbers of bone marrow-derived cells into the endometrium occurs in a predictable manner with hormonal changes of the ovarian cycle, during the process of endometrial decidualization, at the time of blastocyst implantation, and during pregnancy, parturition, and the puerperium. As part of an investigation of the regulation of the leukocyte population of endometrium/decidua, this study was conducted to evaluate further the regulation of interleukin-8 (IL-8) gene expression by transforming growth factor-beta (TGF beta). IL-8 is a neutrophil chemoattractant/activating and T cell chemotactic factor as well as a chemotactic factor for fibroblasts. IL-8 is produced by mesenchymal cells of many tissues, including human endometrial stromal cells in culture. The level of IL-8 messenger ribonucleic acid (mRNA) in endometrial stromal cells and the accumulation of immunoreactive IL-8 in medium are increased by TGF beta 1 treatment of these cells. This response to TGF beta 1 is attributable primarily to an increase in the stability of IL-8 mRNA through a process that is dependent on protein synthesis. Transcription of the IL-8 gene in endometrial stromal cells is not increased, but, rather, is slightly decreased, by treatment with TGF beta 1. The findings of this study indicate that TGF beta may act in endometrial stroma to modulate the stability of IL-8 mRNA.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

Modulation of the levels of interleukin-8 messenger ribonucleic acid and interleukin-8 protein synthesis in human endometrial stromal cells by transforming growth factor-beta 1.