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EP001: The interferon transcriptome in uterine NK cells is upregulated during the second trimester of pregnancy allowing extravillous trophoblast invasion

ABSTRACT: Uterine Natural Killer (uNK) cells regulate essential developmental processes at the maternal-fetal interface during early pregnancy. Uterine NK cell functions are tightly regulated during early placentation to stimulate trophoblast invasion and remodel uterine spiral arteries. Access to human 1st and 2nd trimester uterine tissues allowed us to investigate the transcriptional changes in uNK cells during the early stages of early human pregnancy. Microarray analysis identified 97 upregulated genes in 2nd compared to 1st trimester purified uNK cells of which the majority (61%) clustered as interferon-stimulated-genes (ISG), with ISG15 and ISG20 being upregulated profoundly. Type I interferons (IFNα/β), but not type II interferon (IFNɣ) increased expression of the identified interferon target genes ISG15 and ISG20 in uNK cells in vitro. Moreover, the cytokine-like protein ISG15 stimulated in vitro trophoblast invasion. Second trimester uNK cells promoted trophoblast invasion in vitro, whereas both 1st and 2nd trimester uNK cells stimulated endothelial tube formation. IFNα but not IFNβ stimulation of 1st trimester uNK cells enhanced their capacity to promote trophoblast invasion. In conclusion, the uNK cell interferon transcriptome is upregulated during the 2nd trimester allowing uNK cells to promote trophoblast invasion. Type I interferon signaling regulates uNK cell-induced trophoblast invasion via induction of effector molecules like ISG15. First trimester uNK cells can be induced to act like second trimester uNK cells by IFNα with respect to promotion of trophoblast invasion. Key words: Gene expression profiling ■ uterine natural killer cells ■ extravillous trophoblast invasion ■ interferon alpha ■ ISG15

ORGANISM(S): Homo sapiens

PROVIDER: GSE64898 | GEO | 2020/01/30

REPOSITORIES: GEO

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Project description:Invasion of cytotrophoblasts into uterine tissues is essential for placental development. To identify molecules regulating trophoblast invasion, mRNA signatures of purified villous (CTB, poor invasiveness) and extravillous (EVT, high invasiveness) trophoblasts isolated from first trimester human placentae and villous explant cultures, respectively, were compared using GeneChip analyses yielding 991 invasion/migration related transcripts. Several genes involved in physiological and pathologic cell invasion, including ADAM-12,-19,-28 as well as Spondin-2, were upregulated in EVT. Pathway prediction analyses identified several functional modules associated with either the invasive or the non-invasive trophoblast phenotype. One of the genes which were downregulated in the invasive mRNA pool, heme oxygenase-1 (HO-1), was selected for functional analyses. Real-time PCR analyses, Western blottting, and immunofluorescene of first trimester placentae and differentiating villous explant cultures demonstrated downregulation of HO-1 in invasive EVT as compared to CTB. Modulation of HO-1 expression in loss-of as well as gain-of function cell models (BeWo and HTR8/SVneo, respectively) demonstrated an inverse relationship of HO-1 expression with trophoblast migration in transwell and wound healing assays. Importantly, HO-1 expression led to an increase in protein levels and activity of the nuclear hormone receptor PPARgamma. Pharmacological inhibition of PPARgamma abrogated the inhibitory effects of HO-1 on trophoblast migration. Collectively, our results demonstrate that gene expression profiling of EVT and CTB can be used to unravel novel regulators of cell invasion. Accordingly, we identify heme oxygenase-1 as a negative regulator of trophoblast motility acting via upregulation of PPARgamma. Experiment Overall Design: To identify genes potentially regulating cell invasion trophoblast cells of early human gestation with distinct invasive properties were profiled. Experiment Overall Design: Distinct gene expression signatures of highly invasive EVT (n = 6) and poorly invasive CTB (n = 5) of different first trimester placentae using Affymetrix U133A GeneChips interrogating >20,000 genes were determined.

Project description:The endometrium contains a distinct population of immune cells consisting of 70% natural killer (NK) cells that undergo cyclic changes during the menstrual cycle. However, how these uterine NK (uNK) cells interact with uterine stromal cells (SC) remains unclear. We therefore investigated the paracrine effect of medium conditioned by uNK cells on the gene expression profile of endometrial SC in-vitro using a cDNA Microarray. Our results, verified by real-time PCR and ELISA, reveal that soluble factors from uNK cells substantially alter endometrial SC gene expression. The largest group of up-regulated genes found were chemokines and cytokines, including IL-15 and IL-15RÎ±. The latter could produce a niche for uNK cells allowing proliferation within and recruitment into the uterus, as seen in bone marrow. In addition, the most abundantly up-regulated genes, including IL-8, CCL8 and CXCL1 have also been shown to be stimulated by contact of SC with trophoblast, suggesting that uNK cells work synergistically to support the initial trophoblast migration during implantation. Overall this study demonstrates for the first time the paracrine communication between uNK cells and uterine SC, and adds to the understanding of how the uterine immune system contributes to the changes seen within the cycling endometrium. Keywords: Response of endometrial stromal cells to uNK conditioned medium This study was designed to identify the response of non-decidualised stromal cells from the endometrium, to soluble factors secreted by uterine NK cells. Endometrial stromal cells were isolated from 7 patients and treated with control medium or medium conditioned by uterine Nk cells. THE 'REF' COLUMN ON EACH ARRAY IS THE SIGNAL PRODUCED BY A COMMON REFERNCE RNA SAMPLE THAT WAS LABELLED AS A SINGLE BATCH SAMPLE AND HYBRIDISED TO ALL THE ARRAYS- IT IS A 'COMMON REFERENCE'. THE 'TEST' SAMPLE COMPRISES EACH INDIVIDUAL SAMPLE OF CELLS TREATED AS DESCRIBED IN THE SERIES SUBMISSION. FOR EXAMPLE; SAMPLE Y1 (gsm2435820) IS RNA FROM PATIENT 1 TREATED WITH CONTROL MEDIUM, SAMPLE G1 (GSM245371) IS RNA FROM PATIENT 1 TREATED WITH NK CONDITIONED MEDIUM THESE TWO SAMPLES THEREFORE FORM A PAIR- IE CELLS FROM THE SAME PATIENT TREATED WITH CONTROL OR NK-CONDITIONED MIDIUM. Y2,G2 ARE FROM PATIENT 2, ETC

Project description:Prior to pregnancy, hormonal changes lead to cellular adaptations in the endometrium allowing for embryo implantation. Critical for successful pregnancy establishment, innate immune cells constitute a significant proportion of uterine cells prior to arrival of the embryo and throughout the first trimester in humans and animal models. Abnormal uterine immune cell function during implantation is believed to play a role in multiple adverse pregnancy outcomes. Current work in humans has focused on uterine immune cells present after pregnancy establishment, and limited in vitro models exist to explore unique functions of these cells. With single-cell RNA-sequencing (scRNAseq), we comprehensively compared the human uterine immune landscape of the endometrium during the window of implantation and the decidua during the first trimester of pregnancy. We uncovered global and cell-type-specific gene signatures for each timepoint. Immune cells in the endometrium prior to implantation expressed genes associated with immune metabolism, division, and activation. In contrast, we observed widespread interferon signaling during the first trimester of pregnancy. We also provide evidence of specific inflammatory pathways enriched in pre- and post-implantation macrophages and natural killer (NK) cells in the uterine lining. Using our novel implantation-on-a-chip (IOC) to model human implantation ex vivo, we demonstrate for the first time that uterine macrophages strongly promote invasion of extravillous trophoblasts (EVTs), a process essential for pregnancy establishment. Pre- and post-implantation uterine macrophages promoted EVT invasion to a similar degree as pre- and post-implantation NK cells on the IOC. This work provides a foundation for further investigation of the individual roles of uterine immune cell subtypes present prior to embryo implantation and during early pregnancy, which will be critical for our understanding of pregnancy complications associated with abnormal trophoblast invasion and placentation.

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EP001: The interferon transcriptome in uterine NK cells is upregulated during the second trimester of pregnancy allowing extravillous trophoblast invasion

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