FZD5 is an essential regulator of intestinal crypt homeostasis and surrogate Wnt agonist response
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ABSTRACT:
PROVIDER: PRJNA975582 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR24710742.fastq.gz | Fastqsanger.gz | |||
| SRR24710743.fastq.gz | Fastqsanger.gz | |||
| SRR24710744.fastq.gz | Fastqsanger.gz | |||
| SRR24710745.fastq.gz | Fastqsanger.gz |
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Project description:The rapid regeneration of the small intestinal epithelium is sustained by crypt intestinal stem cells (ISCs). Wnt/b-catenin signaling is essential for intestinal crypt homeostasis and maintenance of Lgr5+ ISC, and yet no single or combinatorial knockout of Frizzled (FZD) genes, representing Wnt receptors, has phenocopied the severe intestinal epithelial effects of Wnt signaling blockade. The elusive identification of specific Frizzled (Fzd) receptor(s) underlying homeostatic proliferation and ISC function would greatly inform therapeutic mucosal repair strategies. In prior pharmacologic studies, bioengineered antagonists that block Wnt binding to both FZD5 and FZD8 receptors induced lethal crypt and villus loss, implicating FZD5 and/or FZD8 as essential for ISCs maintenance. Here, the potential function of Fzd5 in during intestinal homeostasis was examined by epithelial-specific Fzd5 ko, which rapidly elicited lethal pan-intestinal crypt and villus loss, and by Lgr5-specific Fzd5 cKO, which strongly reduced Lgr5+ ISC while inducing their premature differentiation. In parallel, Fzd5 cKO potently repressed Wnt target gene expression, with phenotypic rescue by constitutive activation of b-catenin in vivo and confirmation upon in vitro organoid culture. Fzd5 cKO but not Fzd8 cKO in organoids ablated responsiveness to dual specificity bioengineered FZD5/FZD8-selective Wnt surrogate agonists, which reversed DSS-induced colitis phenotypes in both wild-type and Fzd8 cKO mice. Overall, our results implicate the FZD5 receptor as an essential regulator of crypt homeostasis, Lgr5+ ISCs and intestinal response to bioengineered Wnt surrogate agonists.
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Project description:We previously showed that the combination of markers LNGFR+ and THY-1+ can be used selectively to isolate human mesenchymal stem cells (hMSCs) in bone marrow and several tissues. However, the molecular mechanisms regulating stemness of hMSCs remain to be elucidated. In this study, we found that Frizzled 5 (FZD5) and Receptor tyrosine kinase-like orphan receptor 2 (ROR2) were highly enriched in LNGFR+THY-1+ derived clones that retain a high potential for proliferation (rapidly expanding clones; RECs). WNT5A, the ligand of FZD5, causes FZD5 and ROR2 to co-localize and activates non-canonical Wnt pathway in RECs. Moreover, FZD5 knockdown attenuated proliferation and caused senescence. In contrast, FZD5 overexpression delayed senescence. These results indicate that intrinsic activation of non-canonical Wnt signaling via FZD5 and ROR2 modulates stemness and senescence of RECs. Thus, control of non-canonical Wnt signaling would enable us to regulate hMSC quality and to enhance the efficacy of cell-replacement therapy using hMSCs.
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Project description:Current ventral midbrain dopaminergic progenitor differentiation protocols utilize small molecule inhibitors targeting Glycogen synthase kinase-3 (GSK3) to activate Wnt signaling, a step required for the anterior-posterior patterning of the nervous system and acquisition of the midbrain fate. However, GSK3a and GSK3β are pleiotropic kinases involved in multiple signaling pathways and their inhibition is a known trigger of neurogenesis. We predicted that direct activation of specific Wnt receptors naturally involved during neural patterning would allow for a more precise spatiotemporal control of Wnt/β-catenin signaling and mimic endogenous cell-cell communication mechanisms to improve hPSC differentiation. Here, we characterized the expression of FZD receptors at the surface of neural progenitor cells with different regional identity. Our data shows that FZD5 expression is uniquely upregulated in anterior neural progenitors and is rapidly downregulated as cells adopt a posterior fate. This spatial regulation of Frizzled cell surface expression constitutes a novel regulatory mechanism adjusting the levels of β-catenin signaling along the anterior-posterior axis and possibly contribute to midbrain-hindbrain boundary formation. Using a tetravalent antibody that selectively triggers FZD5 and LRP6 clustering to activate Wnt/β-catenin signaling, we show that the resulting midbrain-patterned neural progenitors exhibit a gene expression program more closely aligned with the anatomical origin of dopaminergic neurons and could hence represent a more efficient source for cell transplant therapies.
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Project description:Current ventral midbrain dopaminergic progenitor differentiation protocols utilize small molecule inhibitors targeting Glycogen synthase kinase-3 (GSK3) to activate Wnt signaling, a step required for the anterior-posterior patterning of the nervous system and acquisition of the midbrain fate. However, GSK3a and GSK3β are pleiotropic kinases involved in multiple signaling pathways and their inhibition is a known trigger of neurogenesis. We predicted that direct activation of specific Wnt receptors naturally involved during neural patterning would allow for a more precise spatiotemporal control of Wnt/β-catenin signaling and mimic endogenous cell-cell communication mechanisms to improve hPSC differentiation. Here, we characterized the expression of FZD receptors at the surface of neural progenitor cells with different regional identity. Our data shows that FZD5 expression is uniquely upregulated in anterior neural progenitors and is rapidly downregulated as cells adopt a posterior fate. This spatial regulation of Frizzled cell surface expression constitutes a novel regulatory mechanism adjusting the levels of β-catenin signaling along the anterior-posterior axis and possibly contribute to midbrain-hindbrain boundary formation. Using a tetravalent antibody that selectively triggers FZD5 and LRP6 clustering to activate Wnt/β-catenin signaling, we show that the resulting midbrain-patterned neural progenitors exhibit a gene expression program more closely aligned with the anatomical origin of dopaminergic neurons and could hence represent a more efficient source for cell transplant therapies.
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Project description:Wnt regulates various cell responses. In dental pulp cells, Wnt signaling control cell proliferation, apoptosis, migration and differentiation. Here, the differential gene expression of human dental pulp stem cells treated with Wnt ligands or Wnt agonist was examined using a high throughput RNA sequencing technique. Results demonstrated that Wnt ligands or Wnt agonist altered numerous gene expression in human dental pulp stem cells.
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Project description:The adult stem cell marker Lgr5 and its close relative Lgr4 are often co-expressed in Wnt-driven proliferative compartments. Conditional deletion of the two genes in the gut impairs expression of Wnt target genes and results in rapid demise of intestinal crypts, thus phenocopying the effects of Wnt pathway inhibition. By mass-spectrometry, we find that Lgr4 and Lgr5 associate with the endogenous Wnt co-receptors Frizzled-5/7 and Lrp5/6 in HEK293 cells and in colorectal cancer cells. We also find that soluble Rspondin1, a Wnt pathway agonist, specifically binds to endogenous Lgr4 on HEK293 cells. In these cells, soluble Rspondin1 potently enhances canonical Wnt signals initiated by Wnt3A. Removal of Lgr4 does not affect Wnt3A-induced signals, but abrogates the Rspondin1-mediated enhancement of these signals, a phenomenon rescued by re-expression of Lgr4, -5 or -6. Rspondin1 and can be rescued by Wnt pathway activation. Lgr4/5/6 are facultative Wnt receptor components that mediate Wnt signal enhancement by soluble Rspondin proteins. We used two different experimental setups to show that concomitant deletion of Lgr4 and Lgr5 affects the expression of Wnt pathway target genes. First, we determined the downregulated genes after Lgr4/5 deletion in AhCre_Lgr4fl/fl_Lgr5 fl/fl mice on day 1 post-deletion, before any histological changes are apparent in these mice (Lgr4/5 gene signature). Next, we acutely withheld the Wnt agonist Rspondin1 from in vitro crypt organoid cultures and performed differential gene expression before, and 1 day after withdrawal (Rspondin1 withdrawal signature). For better comparison we also deleted the Lgr4 and Lgr5 in vitro in organoids isolated from VillinCre_Lgr4fl/fl_Lgr5 fl/fl mice, and performed microarrays 1 day after deletion in vitro. Furthermore, we used published expression data from Apcfl/fl mice (Apc deletion signature). Deletion of Apc results in the immediate upregulation of Wnt pathway target genes. Comparison of the Lgr4/5 gene signature to both the Rspondin1 withdrawal signature and the Apc deletion signatures using Gene Set Enrichment Analysis (GSEA) showed that the genes deregulated after simultaneous deletion of Lgr4 and -5 are in the majority under the control of the Wnt pathway.
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