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Cell-autonomous retinoic acid receptor signaling alters enteric nervous system development with stage-specific effects in mice

ABSTRACT: Purpose: Determine how blocking retinoic acid receptor (RAR) signaling within enteric neural crest-derived cells (ENCDC) from E11.5 stomach or E13.5 colon alters mRNA abundance. These ENCDC become the enteric nervous system. Methods: Enteric nervous system precursors were isolated from mouse E11.5 stomach or E13.5 colon using fluorescence activated cell sorting to purify TdTomato or EYFP expressing cells respectively from fetal bowel. The RarαDN allele encodes a potent RAR dominant negative protein that is expressed after CRE-mediated DNA recombination. Tamoxifen-activated CRE-ERT2 was expressed from the Ret locus for E13.5 colon studies and mice were tamoxifen treated at E10.5 prior to cell sorting. The Wnt1Cre allele was employed for E11.5 stomach studies. RNA-SEQ was performed in quadruplicate using Illumina HiSeq 4000. Sequence reads that passed quality filters were aligned to remove repeat sequences and ribosomal RNA reads and then processed using RNA-Seq unified mapper (RUM) package. RUM files were visualized in the TessLA browser for subsequent analyses. Results: Transcriptional profiling shows RarαDN differentially impacts gene expression in E11.5 stomach and E13.5 colon enteric neural crest-derived cells (ENCDC) that become the enteric nervous system. Conclusions: Blocking of RAR signaling in ENCDC causes dramatic changes in gene expression during early development in a stage-specific manner.

ORGANISM(S): Mus musculus

PROVIDER: GSE165344 | GEO | 2021/02/04

REPOSITORIES: GEO

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Project description:During embryonic development, the first hematopoietic stem cells (HSCs) arise from a transient population of endothelial cells lining the ventral surface of the dorsal aorta, via a process of endothelial to hematopoietic transition (EHT) at embryonic day (E) 10.5. This region contains resident PDGFRA+ stromal cells (PSCs), but their identity and role in HSC generation in the AGM are not well understood. Using a library of compound transgenic mice, we identified a population of PDGFRA+/Nestin-GFP (N-GFP)-/PDGFRB-/CD31- cells with PSC activity in the E10.5 and E11.5 mouse AGM. Freshly isolated PSCs were adept at forming blood vessels with CD31+ luminal endothelium enveloped by PDGFRB+ pericytes, when transplanted subcutaneously into mice. Conditional ablation of PDGFRA+ or Nestin+ cells led to either complete or partial loss of PSCs respectively, with severe loss of endothelial and pericyte-like cells, and concomitant loss of blood formation in the AGM. Lineage tracing studies using tamoxifen induction in PDGFRACreERT2/R26eYFP embryos showed that stromal, sub-endothelial, endothelial and long-term repopulating hematopoietic stem cells (LT-HSCs) cells in the E11.5 AGM were progeny of PDGFRA cells. Using transgenic reporter mice, we showed that MesP1 (mesoderm) derived PDGFRA+ cells dominated the sub-endothelial and deeper ventral stroma in the AGM at E10.5 and E11.5 but were replaced by Wnt1 (neural crest) derived cells at E13.5. Re-aggregation of E11.5 Mesp1 derived PSC cells with E13.5 aortic or adult cardiac non-hemogenic endothelial cells resulted in the generation of endothelial cell derived LT-HSCs. RNA-sequencing analysis of non-hemogenic E13.5 endothelial cells showed up-regulation of EHT genes, WNT, BMP and Notch cell signalling pathways when re-aggregated with E11.5 Mesp1 derived PSCs. LT-HSC generation from these re-aggregates was suppressed by dose-dependent inhibition of PDGF-AA/PDGFRA signalling. Taken together, we report that PSC populations in the AGM are temporally dynamic, and that MesP1-derived PSCs regulate hemogenic potential of the endothelium and that this cooperativity is dependent on PDGF-AA/PDGFRA signalling. This submission represents the RNAseq component of the study.

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Cell-autonomous retinoic acid receptor signaling alters enteric nervous system development with stage-specific effects in mice

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