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The role of epithelial Progesterone Receptor Isoforms in embryo implantation [ChIPseq-PGR-H3K27AC]

ABSTRACT: RNA-seq analysis of uterine luminal epithelium at D4.5 indicates that epithelial PGRA and PGRB shares conseved pathways. Constitutive epithelial PGRA and PGRB disrupts the embryo implantation both through the suppressed FOXO1 signaling by excluding FOXO1 from the nuclear at the uterine epithelium. There are three layers of regulation. Firstly, PGRA and PGRB diminishes Lif transcription in uterine glands by blocking ESR1 binding at the Lif promoter at D3.5 which is critical for the FOXO1 nuclear expression at D4.5 through LIF/pSTAT3/FOXO1. Secondly, PGRA and PGRB directly suppres Foxo1 transcription at the uterine epithelium probably through direct binding at Foxo1 promoter. Thirdly, PGRA and PGRB promotes the Sgk1 transcription, the kinases that phosphorylate FOXO1 to translocate it into cytoplasma for degradation.

ORGANISM(S): Mus musculus

PROVIDER: GSE178538 | GEO | 2021/12/02

REPOSITORIES: GEO

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Project description:Embryo implantation into a receptive endometrium is tightly regulated by a variety of maternal factors, including cytokines, growth factors and transcription factors. Previous studies identified the leukaemia inhibitory factor (LIF), produced in uterine glands, as an essential factor for implantation. It was shown that LIF acts via its cell surface receptor to activate the transcription factor STAT3 in the uterine epithelial cells. However, the mechanisms via which STAT3 promotes uterine receptivity remain unknown. To address the molecular pathways regulated by STAT3 in the uterus, we created mice in which Stat3 gene is conditionally inactivated in uterine epithelium. These mutant mice are infertile due to implantation failure and exhibit a lack of embryo attachment to the luminal epithelium. Gene expression profiling of the epithelial tissue impaired in STAT3 activation revealed dysregulated expression of specific components of junctional complexes, including E-cadherin, M-NM-2-catenin, and claudins, which critically regulate epithelial cell polarity and embryo attachment. Additionally, mice lacking functional epithelial STAT3 showed markedly reduced stromal proliferation and differentiation, indicating that this transcription factor controls stromal function via a paracrine mechanism. The stromal defect arose from a drastic reduction in the production of several members of the epidermal growth factor (EGF) family in luminal epithelium of mutant uteri and consequent lack of activation of EGF receptor signaling and mitotic activity in the stromal cells. Collectively, our results uncovered intricate signaling networks operating downstream of STAT3 in uterine epithelium that regulate epithelial cell polarity, and stromal proliferation and differentiation, which are critical determinants of successful implantation. To identify the downstream targets of STAT3 in mouse uterine epithelial cells during pregnancy, we performed gene expression profling of mouse uterine epithelial cells on day 4 of pregnancy between Stat3 flox control and SW d/d mice. This led to the identification of several junctional molecules (Claudins and Catenins) that are negatively regulated by STAT3 at the time of implantation. Mouse uteirne epithelial cells were isolated from control and knockout mice on the morning of day 4 of pregnancy. (n=3 for each sample), pooled total RNA from these cells was then hybridized to high density affymetrix microarrays according to the Affymetrix protocol (Mouse Genome 430A 2.0 Array) .

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The role of epithelial Progesterone Receptor Isoforms in embryo implantation [ChIPseq-PGR-H3K27AC]

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