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Interleukin-11 (IL-11) is crucial in the decidualization response of the uterine stroma to the implanting blastocyst in the mouse. This study examined the localization and expression of IL-11 in human endometrium throughout the menstrual cycle and of prolactin and leukaemia inhibitory factor (LIF) in secretory phase endometrium. The mRNA expression of IL-11 receptor alpha and the signalling component, gp130, in endometrial tissue were also determined. Immunoreactive IL-11 was highest in the secretory phase and present in decidualized stromal cells, glandular epithelial cells, endothelial and smooth muscle cells, and the mRNA expression was verified by in-situ hybridization. Decidual cells showed the most intense staining. IL-11 receptor alpha and gp130 mRNA were detected throughout the cycle with minimal variation. Expression of IL-11 mRNA and protein preceded that of prolactin. While immunoreactive prolactin was found in stromal, decidual and glandular epithelial cells, prolactin mRNA was confined to decidual cells. In contrast, endometrial LIF expression preceded IL-11 but was largely confined to the glandular epithelium. The sequence of appearance of LIF, IL-11 and prolactin suggests a synchronized role for each in the differentiation of the endometrium. The cyclical changes and cell type specific expression of IL-11 suggests a potential role in the decidualization of stromal cells.

molecular human reproduction

Expression of interleukin-11 during the human menstrual cycle: coincidence with stromal cell decidualization and relationship to leukaemia inhibitory factor and prolactin