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TFEB safeguards trophoblast syncytialization in humans and mice (mouse RNA-Seq)

ABSTRACT: Nutrient sensing and adaptation in the placenta are essential for pregnancy viability and proper fetal growth. Our recent research demonstrates that the placenta adapts to nutrient insufficiency through mTOR inhibition-mediated trophoblast differentiation toward syncytiotrophoblasts (STBs), a highly specialized multinucleated trophoblast subtype directing extensive maternal-fetal interactions. However, the underlying mechanism remains elusive. Here, we unravel the indispensable role of the mTORC1 downstream transcriptional factor TFEB in STB formation both in vitro and in vivo. Endogenous TFEB deficiency significantly impaired STB differentiation in trophoblast cells and placenta organoids. Mechanistically, TFEB conferred direct transcriptional regulation of the fusogen ERVFRD-1 in human trophoblasts and thereby profoundly promoted STB formation, independent of its canonical function as a master regulator of the autophagy-lysosomal pathway. In line with the in vitro findings, systemic or trophoblast-specific deletion of Tfeb compromised STB formation and placental vascular construction, leading to severe embryonic lethality. Moreover, TFEB directs the trophoblast syncytialization response driven by mTORC1 signaling. Importantly, TFEB expression positively correlates with the reinforced trophoblast syncytialization in human fetal growth restriction (FGR) placentas exhibiting suppressed mTORC1 activity. Our findings substantiate that the TFEB-fusogen axis ensures proper STB formation during placenta development and under nutrient stress, shedding light on TFEB as a mechanistic link between nutrient-sensing machinery and trophoblast differentiation.

ORGANISM(S): Mus musculus

PROVIDER: GSE252252 | GEO | 2024/06/16

REPOSITORIES: GEO

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Project description:Trophoblast is the primary epithelial cell type in the placenta, a transient organ required for proper fetal growth and development. We have identified a CDX2+/p63+ cytotrophoblast (CTB) subpopulation in the early post-implantation human placenta, which is significantly reduced later in gestation. CTB differentiate into different trophoblast subtypes, which are responsible for gas/nutrient exchange (syncytiotrophoblast/STB) and invasion and maternal vascular remodeling (extravillous trophoblast/EVT). Study of early human placental development is severely hampered by lack of a representative trophoblast stem cell (TSC) model, with the capacity for self-renewal and the ability to differentiate into both STB and EVT. We describe a reproducible protocol, using defined media containing BMP4, by which human embryonic stem cells (hESC) can be differentiated into CDX2+/p63+ CTB-like cells. These cells can be replated to further differentiate into STB- and EVT-like cells, based on marker expression, hormone secretion and invasive ability. Differentiation of hPSC-derived CTB in hypoxia leads to reduced hCG secretion and STB-associated gene expression, instead inducing EVT differentiation in a hypoxia-inducible factor-dependent manner. Human embryonic stem cells (hESC) (WA09/H9) were maintained on Geltrex-coated plates (BD Biosciences ) in StemPro (Thermo Fisher) + bFGF (12 ng/ml). Undifferentiated hESC (D-2) were switched to minimal media (EMIM (Erb et al., 2011) containing KO DMEM/F12 (Gibco), 1% Insulin-Transferrin-Selenium Mix (Sigma-Aldrich), 1% NEAA (Gibco), 2mM L-Glutamine (Corning), 0.1mM 2-mercaptoethanol (Gibo), and 2% BSA (Gemini Bio Products)) for 2 days then treated with BMP4 (StemRD, 10ng/ml) for 3 days in minimal media+BMP4 (D3). At D3, cells were replated onto Geltrex in Feeder Conditioned Media +BMP4 and cultured in normoxia (20% O2) or hypoxia (2% O2) for 2 days (D3+2) to assess the effect of hypoxia. Cells were infected with lentiviral shRNA for shScramble (control) or shARNT, the beta subunit of the Hypoxia Inducible Factor (HIF) complex to assess the effect of ARNT knockdown. Each sample includes biological triplicates.

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TFEB safeguards trophoblast syncytialization in humans and mice (mouse RNA-Seq)

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