scholarly journals Regulation of Pancreatic Juxtaductal Endocrine Cell Formation by FoxO1

2009 ◽  
Vol 29 (16) ◽  
pp. 4417-4430 ◽  
Author(s):  
Tadahiro Kitamura ◽  
Yukari Ido Kitamura ◽  
Masaki Kobayashi ◽  
Osamu Kikuchi ◽  
Tsutomu Sasaki ◽  
...  
Keyword(s):  
Progenitor Cells ◽  
Endocrine Cell ◽  
Cell Formation ◽  
Diabetic Patients ◽  
Loss Of Function ◽  
Β Cells ◽  
Pancreatic Cell ◽  
Pancreatic Progenitor ◽  
Endocrine Differentiation ◽  
Pancreatic Progenitor Cells

ABSTRACT An understanding of the mechanisms that govern pancreatic endocrine cell ontogeny may offer strategies for their somatic replacement in diabetic patients. During embryogenesis, transcription factor FoxO1 is expressed in pancreatic progenitor cells. Subsequently, it becomes restricted to β cells and to a rare population of insulin-negative juxtaductal cells (FoxO1+ Ins−). It is unclear whether FoxO1+ Ins− cells give rise to endocrine cells. To address this question, we first evaluated FoxO1's role in pancreas development using gain- and loss-of-function alleles in mice. Premature FoxO1 activation in pancreatic progenitors promoted α-cell formation but curtailed exocrine development. Conversely, FoxO1 ablation in pancreatic progenitor cells, but not in committed endocrine progenitors or terminally differentiated β cells, selectively increased juxtaductal β cells. As these data indicate an involvement of FoxO1 in pancreatic lineage determination, FoxO1+ Ins− cells were clonally isolated and assayed for their capacity to undergo endocrine differentiation. Upon FoxO1 activation, FoxO1+ Ins− cultures converted into glucagon-producing cells. We conclude that FoxO1+ Ins− juxtaductal cells represent a hitherto-unrecognized pancreatic cell population with in vitro capability of endocrine differentiation.

scholarly journals MFng Is Dispensable for Mouse Pancreas Development and Function

2009 ◽  
Vol 29 (8) ◽  
pp. 2129-2138 ◽  
Author(s):  
Per Svensson ◽  
Ingela Bergqvist ◽  
Stefan Norlin ◽  
Helena Edlund
Keyword(s):  
Cell Differentiation ◽  
Notch Signaling ◽  
Pancreas Development ◽  
Loss Of Function ◽  
Pancreatic Cell ◽  
Targeted Deletion ◽  
Mouse Pancreas ◽  
Pancreatic Progenitor ◽  
Pancreatic Progenitor Cells ◽  
And Function

ABSTRACT Notch signaling regulates pancreatic cell differentiation, and mutations of various Notch signaling components result in perturbed pancreas development. Members of the Fringe family of β1,3-N-acetylglucosaminyltransferases, Manic Fringe (MFng), Lunatic Fringe (LFng), and Radical Fringe (RFng), modulate Notch signaling, and MFng has been suggested to regulate pancreatic endocrine cell differentiation. We have characterized the expression of the three mouse Fringe genes in the developing mouse pancreas between embryonic days 9 and 14 and show that the expression of MFng colocalized with the proendocrine transcription factor Ngn3. In contrast, the expression of LFng colocalized with the exocrine marker Ptf1a, whereas RFng was not expressed. Moreover, we show that expression of MFng is lost in Ngn3 mutant mice, providing evidence that MFng is genetically downstream of Ngn3. Gain- and loss-of-function analyses of MFng by the generation of mice that overexpress MFng in early pancreatic progenitor cells and mice with a targeted deletion of MFng provide, however, evidence that MFng is dispensable for pancreas development and function, since no pancreatic defects in these mice were observed.

scholarly journals Isolation of Pancreatic Progenitor Cells with the Surface Marker of Hematopoietic Stem Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Fengxia Ma ◽  
Fang Chen ◽  
Ying Chi ◽  
Shaoguang Yang ◽  
Shihong Lu ◽  
...  
Keyword(s):  
Stem Cells ◽  
Hematopoietic Stem Cells ◽  
Progenitor Cells ◽  
Culture System ◽  
Isolated Cells ◽  
Pancreatic Cell ◽  
Hematopoietic Stem ◽  
Pancreatic Progenitor ◽  
Pancreatic Progenitor Cells ◽  
Embryonic Pancreas

To isolate pancreatic progenitor cells with the surface markers of hematopoietic stem cells, the expression of stem cell antigen (Sca-1) and c-Kit and the coexpression of them with pancreatic duodenal homeobox-1 (PDX-1), neurogenin 3 (Ngn3), and insulin were examined in murine embryonic pancreas. Then different pancreatic cell subpopulations were isolated by magnet-activated cell sorting. Isolated cells were cultured overnight in hanging drops. When cells formed spheres, they were laid on floating filters at the air/medium interface. With this new culture system, pancreatic progenitor cells were induced to differentiate to endocrine and exocrine cells. It was shown that c-Kit and Sca-1 were expressed differently in embryonic pancreas at 12.5, 15.5, and 17.5 days of gestation. The expression of c-Kit and Sca-1 was the highest at 15.5 days of gestation. c-Kit rather than Sca-1 coexpressed with PDX-1, Ngn3, and insulin. Cells differentiated from c-Kit-positive cells contained more insulin-producing cells and secreted more insulin in response to glucose stimulation than that from c-Kit-negative cells. These results suggested that c-Kit could be used to isolate pancreatic progenitor cells and our new culture system permitted pancreatic progenitor cells to differentiate to mature endocrine cells.

scholarly journals Notch Controls Multiple Pancreatic Cell Fate Regulators Through Direct Hes1-mediated Repression

2018 ◽  
Author(s):  
Kristian H. de Lichtenberg ◽  
Philip A. Seymour ◽  
Mette C. Jørgensen ◽  
Yung-Hae Kim ◽  
Anne Grapin-Botton ◽  
...  
Keyword(s):  
Notch Signaling ◽  
Cell Fate ◽  
Target Genes ◽  
Specific Gene ◽  
Pancreatic Cell ◽  
Pancreatic Progenitor ◽  
Endocrine Differentiation ◽  
Pancreatic Progenitor Cells ◽  
Genes Encoding ◽  
Direct Target

AbstractNotch signaling and its effector Hes1 regulate multiple cell fate choices in the developing pancreas, but few direct target genes are known. Here we use transcriptome analyses combined with chromatin immunoprecipitation with next-generation sequencing (ChIP-seq) to identify direct target genes of Hes1. ChIP-seq analysis of endogenous Hes1 in 266-6 cells, a model of multipotent pancreatic progenitor cells, revealed high-confidence peaks associated with 354 genes. Among these were genes important for tip/trunk segregation such asPtf1aandNkx6-1, genes involved in endocrine differentiation such asInsm1andDll4, and genes encoding non-pancreatic basic-Helic-Loop-Helix (bHLH) factors such asNeurog2andAscl1. Surprisingly, we find that Hes1 binds a large number of loci previously reported to bind Ptf1a, including a site downstream of theNkx6-1gene. Notably, we find a number of Hes1 bound genes that are upregulated by γ-secretase inhibition in pancreas explants independently ofNeurog3function, including the tip progenitor/acinar genes;Ptf1a, Gata4, Bhlha15, andGfi1. Together, our data suggest that Notch signaling suppress the tip cell fate by Hes1-mediated repression of the tip-specific gene regulatory network module that includes transcriptional regulators such as Ptf1a, Gata4, Mist1, and Gfi1. Our data also uncover new molecular targets of Notch signaling that may be important for controlling cell fate choices in pancreas development.

scholarly journals Human Fetal Bone Marrow-Derived Mesenchymal Stem Cells Promote the Proliferation and Differentiation of Pancreatic Progenitor Cells and the Engraftment Function of Islet-Like Cell Clusters

2019 ◽  
Vol 20 (17) ◽  
pp. 4083
Author(s):  
Xing Yu Li ◽  
Shang Ying Wu ◽  
Po Sing Leung
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Mesenchymal Stem Cells ◽  
Progenitor Cells ◽  
Pancreatic Progenitor ◽  
Pancreatic Progenitor Cells ◽  
Proliferation And Differentiation ◽  
Differentiation And Proliferation

Pancreatic progenitor cells (PPCs) are the primary source for all pancreatic cells, including beta-cells, and thus the proliferation and differentiation of PPCs into islet-like cell clusters (ICCs) opens an avenue to providing transplantable islets for diabetic patients. Meanwhile, mesenchymal stem cells (MSCs) can enhance the development and function of different cell types of interest, but their role on PPCs remains unknown. We aimed to explore the mechanism-of-action whereby MSCs induce the in vitro and in vivo PPC/ICC development by means of our established co-culture system of human PPCs with human fetal bone marrow-derived MSCs. We examined the effect of MSC-conditioned medium on PPC proliferation and survival. Meanwhile, we studied the effect of MSC co-culture enhanced PPC/ICC function in vitro and in vivo co-/transplantation. Furthermore, we identified IGF1 as a critical factor responsible for the MSC effects on PPC differentiation and proliferation via IGF1-PI3K/Akt and IGF1-MEK/ERK1/2, respectively. In conclusion, our data indicate that MSCs stimulated the differentiation and proliferation of human PPCs via IGF1 signaling, and more importantly, promoted the in vivo engraftment function of ICCs. Taken together, our protocol may provide a mechanism-driven basis for the proliferation and differentiation of PPCs into clinically transplantable islets.

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