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Induced overexpression of Pdx1 and Ngn3 in a mouse ES cell-derived endoderm population induces pancreatic differentiation

ABSTRACT: Induced overexpression of Pdx1 in activin-induced endoderm population resulted in the upregulation of pancreas-related genes such as insulin 1 and 2 at day 20. To enhance the developmental progression from the pancreatic bud to the formation of the endocrine lineages, we next expressed neurogenin3 (Ngn3) together with Pdx-1. Induced overexpression of Pdx1 together with Ngn3 dramatically increased Insulin 1 mRNA by day 9 differentiation. The levels of insulin 1 mRNA present in the induced EBs represented approximately 100 % of that found in insulinoma cell line, betaTC6. We also confirmed insulin and C-peptide staining by immunohistochemistry. These cells process and secrete insulin and respond to various insulin secretagogues. These inductive effects were restricted to c-kit+ endoderm enriched EB-derived populations suggesting that Pdx1/Ngn3 functions at the level of pancreatic specification of endoderm in this model. Microarray analysis showed that Pdx1/Ngn3 regulated the expression of a broad spectrum of pancreatic endocrine cell-related genes.

ORGANISM(S): Mus musculus

PROVIDER: GSE23752 | GEO | 2010/08/24

SECONDARY ACCESSION(S): PRJNA130741

REPOSITORIES: GEO

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Induced overexpression of Pdx1 and Ngn3 in a mouse ES cell-derived endoderm population induces pancreatic differentiation

Project description:Induced overexpression of Pdx1 in activin-induced endoderm population resulted in the upregulation of pancreas-related genes such as insulin 1 and 2 at day 20. To enhance the developmental progression from the pancreatic bud to the formation of the endocrine lineages, we next expressed neurogenin3 (Ngn3) together with Pdx-1. Induced overexpression of Pdx1 together with Ngn3 dramatically increased Insulin 1 mRNA by day 9 differentiation. The levels of insulin 1 mRNA present in the induced EBs represented approximately 100 % of that found in insulinoma cell line, betaTC6. We also confirmed insulin and C-peptide staining by immunohistochemistry. These cells process and secrete insulin and respond to various insulin secretagogues. These inductive effects were restricted to c-kit+ endoderm enriched EB-derived populations suggesting that Pdx1/Ngn3 functions at the level of pancreatic specification of endoderm in this model. Microarray analysis showed that Pdx1/Ngn3 regulated the expression of a broad spectrum of pancreatic endocrine cell-related genes. On day 4 of a multiday differentiation protocol, EBs were dissociated and cultured in serum-free growth medium supplemented with differentiation facots, with or without Dox (1 ug/ml). On day 6, EBs were replated on gelatin in 12-well low-cluster dishes (Nunc) to obtain non-adherent floating EBs with or without Dox (1 ug/ml) and cultured out to day 13, at which time RNA was harvested for microarray analysis.

2010-08-24 | E-GEOD-23752 | biostudies-arrayexpress

Role of Neurogenin3 phosphorylation in the reprogramming of pancreatic organoids into endocrine cells

Project description:During pancreatic development, Neurogenin3 (Ngn3) promotes the differentiation of endocrine cells, including insulin-producing β-cells. Our previous work has shown that Ngn3 phosphorylation on multiple serine-proline (SP) sites increases protein stability and endocrine differentiation (Azzarelli et al., DevCell 2017). Here, we aim to exploit our recent data to investigate whether manipulation of Ngn3 phosphostatus might improve in vitro generation of β-cells for replacement therapies in diabetes. A potential source of β-cells comes from fate conversion of exocrine pancreatic cells into the endocrine lineage, by overexpression of 3 transcription factors, Ngn3, Pdx1 and MafA. Using this approach we show that pancreatic ductal cells grown in vitro as 3D organoids can be reprogrammed to express insulin. The efficiency can be strongly enhanced by substituting wild type Ngn3 with a the un(der)phosphorylated and more active Ngn3 form (6S-A Ngn3). Here we perform transcriptomic analysis of a low number of pancreatic organoid cells expressing wild type or phosphomutant Ngn3, alone or in various combination Pdx1 and/or MafA. The analysis revealed endocrine differentiation and in particular β-like cell gene expression in the conditions where Ngn3 was in combination with both Pdx1 and MafA.

2018-12-26 | GSE114838 | GEO

Transcription profiling of mouse Ngn3 expressing cells and endocrine pancreatic cells from wild type and Ngn3 mutant animals at day 15 of embryonic development

Project description:The basic helix-loop-helix transcription factor Neurogenin3 (Ngn3/Neurog3) is expressed in endocrine progenitor cells in the embryonic mouse pancreas. Ngn3 controls endocrine cell fate decisions. Ngn3 deficient mice do not develop any pancreatic endocrine cells, including insulin producing beta cells, and die postnatally from diabetes. Therefore, the characterization of gene expression in Ngn3-expressing cells and their progeny is of particular interest for the development of novel strategies for cell replacement therapies in type-1 diabetes. Here we describe two studies. In the first study (8 assays) we used mice where the EYFP (Enhanced Yellow fluorescent Protein) is expressed under the control of Ngn3 regulatory elements (knock add on strategy). EYFP-positive, Ngn3-expressing cells, were FACS sorted from embryonic pancreas at day 15.5 (E15.5), as well as EYFP-negative cells. In the second study (6 assays) we compared wild-type and Ngn3 mutant pancreas at E15.5. All samples were hybridized to Affymetrix GeneChip Mouse Genome 430.2.0 array.

2009-12-03 | E-CBIL-48 | biostudies-arrayexpress

Transcription profiling of mouse Ngn3-expressing pancreatic cells in a time series through embryonic development and adult islet cells

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2007-12-15 | E-CBIL-40 | biostudies-arrayexpress

Identifying new interactors of NGN3 through IP-MS

Project description:NGN3 is a transcription factor whose transient expression during pancreatic development is vital for the generation of endocrine pancreatic cells, including beta cells. NGN3 stabilisation has been shown to induce exocrine-to-endocrine cell plasticity in the murine pancreas, making it a viable target for therapies aiming to replenish beta cells after immune-mediated destruction in type 1 diabetes patients. Here, we set out to identify new interactors of NGN3 that could play a role in its post-translational regulation. We transfected HEK293A cells with HA-tagged NGN3 and carried out immunoprecipitation of the HA-tag, followed by analysis of co-immunoprecipitated interactors via LC-MS/MS.

2023-03-27 | PXD033691 | Pride

Expression data from Xenopus endoderm at stage 15 following four hours of Ngn3-GR overexpression

2012-04-01 | GSE29017 | GEO

Expression data from Xenopus endoderm at stage 15 following four hours of Ngn3-GR overexpression

Project description:Ngn3 is a master regulator of pancreatic endocrine development. It is necessary for the creation of all endocrine cells in mice. Little is known about the genes that act downstream of the transcription factor Ngn3 in pancreas endocrine development to specify each of the endocrine lineages. As a consequence, little is known about the genes involved in early development and the specification of the beta cell. We used microarrays to identify Ngn3 downstream genes that are involved in early and ectopic beta cell development in Xenopus laevis. We overexpressed Ngn3 in the Xenopus early endoderm and analyzed the genes that are upregulated four hours after. Xenopus laevis embryos were injected with Ngn3-GR mRNA at the eight-cell stage in the two dorsal vegetal blastomeres. Embryos at stage 12 were either treated with dexamethasone (+DEX) for four hours or no DEX (-DEX). The endoderm was dissected at stage 15. We looked for genes upregulated in the +DEX samples compared to the -DEX samples.

2012-03-31 | E-GEOD-29017 | biostudies-arrayexpress

Transcriptional program for induced delta cell on day10

Project description:Direct lineage conversion of adult cells is a promising approach for regenerative medicine. A major challenge of lineage conversion is to generate specific subtypes of cells, closely related cells with distinct properties. The pancreatic islets contain three major hormone-secreting endocrine subtypes: insulin+ β-cells, glucagon+ α-cells, and somatostatin+ δ-cells. We previously reported that a combination of three transcription factors, Ngn3, Mafa, and Pdx1, directly reprogram pancreatic acinar cells to β-cells. We now show that acinar cells can be converted to δ-like and α-like cells by Ngn3 and Ngn3+Mafa respectively. Thus, three major islet endocrine subtypes can be derived by acinar reprogramming. Ngn3 promotes establishment of a generic endocrine state in acinar cells at the onset of reprogramming in addition to promoting δ-specification. Mafa and Pdx1 suppress δ-specification in α- and β-cell formation. These studies identify a set of defined factors whose combinatorial actions reprogram acinar cells to distinct islet endocrine subtypes in vivo. induced beta cells samples at day 10 collected for the microarray

2013-11-20 | E-GEOD-52522 | biostudies-arrayexpress

Plasticity of adult human pancreatic duct cells by neurogenin3-mediated reprogramming

Project description:Aims/hypothesis: Duct cells isolated from adult human pancreas can be reprogrammed to express islet beta cell genes by adenoviral transduction of the developmental transcription factor neurogenin3 (Ngn3). In this study we aimed to fully characterize the extent of this reprogramming and intended to improve it. Methods: The extent of the Ngn3-mediated duct-to-endocrine cell reprogramming was measured employing genome wide mRNA profiling. By modulation of the Delta-Notch signaling or addition of pancreatic endocrine transcription factors Myt1, MafA and Pdx1 we intended to improve the reprogramming. Results: Ngn3 stimulates duct cells to express a focused set of genes that are abundant in islet endocrine cells and/or neural tissues. This neuro-endocrine shift, however, covers a minor fraction (5%) of the estimated genome-wide transcriptome difference between duct and islet endocrine cells. Interestingly, transduction of exogenous Ngn3 activates endogenous Ngn3 suggesting auto-activation of this gene. Furthermore, pancreatic endocrine reprogramming of human duct cells can be moderately enhanced by inhibition of Delta-Notch signaling as well as by co-expressing the transcription factor Myt1, but not MafA and Pdx1. Conclusions/interpretation: The results provide further insight into the plasticity of adult human duct cells and suggest measurable routes to enhance Ngn3-mediated in vitro reprogramming protocols for regenerative beta cell therapy in diabetes. We used Affymetrix HG133A and HG133B to get a comprehensive view on the reprogramming potential in vitro of human pancreatic duct cell cultures (n=3-4) at 3 and 14/20 days after ectopic adenoviral expression of murine neurogenin 3 as compared to GFP-expressing control vectors.

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Transcriptional program for induced delta cell on day10

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