Investigating Aging-Related Endometrial Dysfunction Using Endometrial Organoids

Abstract

Ageing of the endometrium is a critical factor that affects reproductive health, yet its intricate mechanisms remain poorly explored. In this study, we performed transcriptome profiling and experimental verification of endometrium and endometrial organoids from young and advanced age females, to elucidate the underlying mechanisms and to explore novel treatment strategies for endometrial ageing. First, we found that age-associated decline in endometrial functions including fibrosis and diminished receptivity, already exists in reproductive age. Subsequently, based on RNA-seq analysis, we identified several changes in molecular processes affected by age, including fibrosis, imbalanced inflammatory status including Th1 bias in secretory phase, cellular senescence and abnormal signalling transduction in key pathways, with all processes been further validated by molecular experiments. Finally, we uncovered for the first time that PI3K-AKT-FOXO1 signalling pathway is overactivated in ageing endometrium and is closely correlated with fibrosis and impaired receptivity characteristics of ageing endometrium. Blocking or activation of PI3K by LY294002 or 740Y-P could attenuate the effect of ageing or accelerate dysfunction of endometrial organoids. This discovery is expected to bring new breakthroughs for understanding the pathophysiological processes associated with endometrial ageing, as well as treatment strategies to improve reproductive outcomes in women of advanced reproductive age.

Keywords

endometrial ageing / fibrosis / inflammation / organoids / PI3K/AKT/FOXO1 / receptivity

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