4.7 Article

Endometrial Dysbiosis Is Related to Inflammatory Factors in Women with Repeated Implantation Failure: A Pilot Study

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JOURNAL OF CLINICAL MEDICINE
卷 11, 期 9, 页码 -

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MDPI
DOI: 10.3390/jcm11092481

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endometrial microbiota; dysbiosis; inflammation; in vitro fertilization; repeated implantation failure

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This cohort study outlines the relationship between endometrial microbiota, inflammation, and in vitro fertilization (IVF) outcomes. Endometrial dysbiosis was found to be associated with inflammation-related changes in the endometrium, which may impair the process of embryo implantation. Assessing uterine microbiota is crucial for patients undergoing IVF treatment.
An abnormal endometrial microbiota has been suggested to impair the process of embryo implantation, thus leading to repeated implantation failure (RIF) in women undergoing in vitro fertilization (IVF). However, the molecular mechanisms linking uterine microbiota and IVF out-comes are still an open question. The aim of this cohort study was to outline the relationship between endometrial microbiota, inflammation and IVF outcomes. To this purpose, endometrial microbiota and selected components of the cytokine network were analyzed in women presenting RIF and divided between eubiosis and dysbiosis groups, according to the percentage of endometrial lactobacilli (>= 90% or <90%, respectively). The Dysbiosis group presented significantly higher tissue concentrations of the inflammatory markers (IL-6, IL-1 beta, HIF-1 alpha and COX-2) and significantly lower levels of the anti-inflammatory/well-being factors, IL-10 and IGF-1, with respect to women with eubiosis. Moreover, the Lactobacillus percentage was negatively related to the concentrations of the inflammatory molecules and positively related to IL-10/IGF-1. Interestingly, the number of IVF attempts was directly related to the levels of the inflammatory factors COX-2, IL-1 beta and HIF-1 alpha in the eubiosis group. Overall, endometrial dysbiosis was demonstrated to be associated with inflammation-related endometrial changes affecting the process of embryo implantation, underlining the importance of assessing uterine microbiota in patients undergoing IVF.

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