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Isl1 identifies the extraembryonic mesodermal / allantois progenitors and required for placenta morphogenesis and vasculature formation [RNA-Seq]

ABSTRACT: The transcription factor Isl1 is expressed in the progenitors of the Ex-Mes and allantois, however its role in the placentation remains unclear. Our studies showed that deletion of Isl1 causes defects in allantois growth, chorioallantoic fusion and placenta vessel morphogenesis. RNA-seq analyses have revealed that Isl1 regulates the expression of genes important for Ex-Mes multipotency, differentiation and diversification. Isl1 promotes allantoic endothelial but inhibits mesenchymal cell differentiation. Isl1 plays an important role in regulating multiple genetic and epigenetic pathways of vascular morphogenesis. Allantoic signals regulated by Isl1 in turn mediate the inductive interactions between the allantois and chorion critical for chorionic epithelium differentiation, villous formation, and labyrinth angiogenesis. In conclusion, our study provides an integrated insight into the mechanisms underlying placental lineage differentiation, diversification, and vascular formation, highlighting the necessity of Isl1 for early placenta morphogenesis. Our study suggests the potential utility of Isl1 in regenerative medicine application using the stem cells derived from the placenta, umbilical cord and amnionic membrane.

ORGANISM(S): Mus musculus

PROVIDER: GSE247182 | GEO | 2024/09/13

REPOSITORIES: GEO

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Project description:Visceral fat (VF) and subcutaneous fat (SF) are developmentally different tissues with different gene expression. Islet-1 (ISL1), a LIM-homeobox transcription factor with important developmental and regulatory function in islet, neural, and cardiac tissue, is virtually absent in SF but substantially expressed in the stromovascular [preadipocyte containing] fraction of VF; expression correlates negatively with adiposity in rodents and man. ISL1 expression is transiently increased in 3T3-L1 preadipocytes during early differentiation, suggesting a functional role. To examine the role of ISL1 in adipogenesis, we tested whether retroviral overexpression of ISL1 in 3T3-L1 preadipocytes affected their ability to differentiate into mature adipocytes. Terminal differentiation was assessed by Oil Red O [lipid droplet] staining and by immunoblot detection of adipocyte marker proteins, including aP2 and GLUT4. ISL1 significantly inhibited lipid droplet formation, reduced lipid accumulation (about 80% inhibition, p<0.05), and substantially inhibited aP2 and GLUT4 expression. ISL1 did not inhibit expression of C/EBPb and C/EBPd after induction of differentiation, but reduced PPARg and C/EBPa by >50% at both mRNA and protein level. In addition, the PPARg agonist, rosiglitazone, substantially rescued ISL1 inhibited adipogenesis in the absence of exogenous PPARg, and fully rescued in the presence of exogenous PPARg. In summary, ISL1 overexpression inhibited fat droplet formation, lipid accumulation, and adipocyte-specific gene expression; there was accompanying inhibition of C/EBPa, PPARg and downstream gene expression. We conclude that ISL1 overexpression inhibited adipocyte differentiation by inhibition of PPARg regulated gene expression. As abdominal obesity strongly correlates with insulin resistance, and cardiovascular risk, ISL1 up-regulation may impact abdominal obesity and its concomitant metabolic derangements. Total cellular RNA was isolated from 3T3-L1 cells expressing Flag-ISL1 or not at 48 h following treatment with differentiation cocktail. Individual RNA from biological triplicates was used for microarray analysis.

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Isl1 identifies the extraembryonic mesodermal / allantois progenitors and required for placenta morphogenesis and vasculature formation [RNA-Seq]

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