Dataset Information

Endocardial Tie2 orchestrates cardiac trabeculation via sequestering FOXO1 within the cytoplasm and stimulating versican cleavage

ABSTRACT: Abnormal cardiac trabeculation often leads to congenital heart disease (CHD). TIE2-ANG1 signaling is a key regulator of endocardial growth during trabeculation. However, little is known about the underlying mechanisms. Here we demonstrate that loss of endocardial Tie2 via Nfatc1Cre resulted in increased nuclear localization of Forkhead box O1 (FOXO1), reduced phosphorylation of AKT (the direct regulator of FOXO1) and reduced expression of several proliferation promoting genes in endocardial cells (EdCs). The cardiac defects seen in endocardial Tie2-deficient hearts were phenocopied by forced activation of FOXO1 within the endocardium and partially rescued by loss of FoxO1. Conversely, excessive PI3K signaling (the direct regulator of phosphorylation of AKT) in EdCs caused cardiac hypotrabeculation. Further, we identify that endocardial loss of Tie2 resulted in impaired cleavage of versican, which was associated with enhanced expression of ADAMTS endogenous inhibitor TIMP3 in Tie2-cko EdCs. Thus, our results suggest that TIE2 signaling in the early embryonic endocardium promotes endocardial growth via sequestering FOXO1 within the cytoplasm and modulates cardiomyocyte proliferation via stimulating versican cleavage to orchestrate myocardial trabeculation, providing insights into the pathogenesis of CHD.

ORGANISM(S): Mus musculus

PROVIDER: GSE334972 | GEO | 2026/06/30

REPOSITORIES: GEO

ACCESS DATA

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Project description:Ventricular chambers are essential for the rhythmic contraction and relaxation that occurs in every hearbeat throughout life. Congenital abnormalities in ventricular chamber formation cause severe human heart defects. How the early trabecular meshwork of myocardial fibres forms and subsequently develops into mature chambers is still poorly understood. Here we show that Notch signalling first connects chamber endocardium and myocardium to sustain trabeculation and later coordinates ventricular patterning and compaction with coronary vessel development to give rise to the mature chamber via a temporal sequence of ligand signalling determined by the glycosyltransferase Manic Fringe (Mfng). The early endocardial expression of Mfng favours Dll4-Notch1 signalling, Which induces trabeculation in the developing ventricle.Ventricular maturation and compaction in turn require Mfng and Dll4 downregulation in the endocardium, Which allows myocardial Jag1- And Jag2- Signalling to Notch1 in this tissue.Timely and spatial perturbation of this signalling equilibrium severely disrupts heart chamber formation. Our results open a new research avenue into the pathogenesis of cardiomyopathies. Dll4 and Notch1 conditional KOs using Nfact1 and/or Tie2 driven Cre expression: RNA was isolated from pooled whole hearts of 8 (Nfact1) or 9 (Tie2) E9.5 embryos per replicate. Dll4flox;Nfatc1-Cre and WT siblings (4 KO and 4 WT replicates), Notch1flox;Nfatc1-Cre and WT siblings (3 KO and 2 WT replicates), Dll4flox;Tie2-Cre and WT siblings (3 KO and 3 WT replicates). Jag1, Jag2 and Jag1Jag2 conditional KOs using cTnT driven Cre expression: RNA was isolated from pooled heart ventricles of 4 E15.5 embryos per replicate. Jag1flox;cTnT-Cre and WT siblings (3 KO and 3 WT replicates), Jag2flox;cTnT-Cre and WT siblings (3 KO and 2 WT replicates). Jag1flox;jag2flox;cTnT-Cre and WT siblings (3 KO and 2 WT replicates). MFng Gain Of Function using Tie2 driven Cre expression: RNA was isolated from pooled heart ventricles of 4 E15.5 embryos per replicate. MFng;Tie2-Cre and WT siblings (4 GOF and 4 WT replicates). For Dll4, Noth1 and Jag1 KOs, libraries were prepared using the standard Illumina TrueSeq RNASeq library preparation kit and sequenced in a GAIIx Illumina sequencer using a 75bp single end elongation protocol. For Jag2 and Jag1Jag2 KOs and MFng GOF libraries were prepared prepared using the NEBNext Ultra RNA Library Prep Kit for Illumina and sequenced in a HiSeq2500 Illumina sequencer using a 61bp single end elongation protocol

Dataset Information

Endocardial Tie2 orchestrates cardiac trabeculation via sequestering FOXO1 within the cytoplasm and stimulating versican cleavage

Dataset's files

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets