Journal ArticleDOI
The role of the transcriptional regulator Ptf1a in converting intestinal to pancreatic progenitors
Yoshiya Kawaguchi,Bonnie Cooper,Maureen Gannon,Michael Ray,Raymond J. MacDonald,Christopher V.E. Wright +5 more
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TLDR
Rec recombination-based lineage tracing in vivo is used to show that PTF1a is expressed at these early stages in the progenitors of pancreatic ducts, exocrine and endocrine cells, rather than being an exocrine-specific gene as previously described.Abstract:
Pancreas development begins with the formation of buds at specific sites in the embryonic foregut endoderm. We used recombination-based lineage tracing in vivo to show that Ptf1a (also known as PTF1-p48) is expressed at these early stages in the progenitors of pancreatic ducts, exocrine and endocrine cells, rather than being an exocrine-specific gene as previously described. Moreover, inactivation of Ptf1a switches the character of pancreatic progenitors such that their progeny proliferate in and adopt the normal fates of duodenal epithelium, including its stem-cell compartment. Consistent with the proposal that Ptf1a supports the specification of precursors of all three pancreatic cell types, transgene-based expression of Pdx1, a gene essential to pancreas formation, from Ptf1a cis-regulatory sequences restores pancreas tissue to Pdx1-null mice that otherwise lack mature exocrine and endocrine cells because of an early arrest in organogenesis. These experiments provide evidence that Ptf1a expression is specifically connected to the acquisition of pancreatic fate by undifferentiated foregut endoderm.read more
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Dissertation
Coordinating Cell Cycle Exit and Differentiation in the Mammalian Retina and its Dependence on Rb
Journal ArticleDOI
Pancreatic duct-like cell line derived from pig embryonic stem cells: expression of uroplakin genes in pig pancreatic tissue
TL;DR: The PICM-31D cell line models the mucus-secreting ductal cells of the fetal pig pancreas and expresses pancreatic ductal cell-related transcription factors, but little or no Pancreas progenitor cell markers such as PTF1A, NKX6-1, SOX2, or NGN3.
Dissertation
Maf and Mitf transcription factors regulate pancreatic endocrine cell differentiation and function
TL;DR: Given the differences in spatio-temporal expression pattern of MafA and MafB in developing and adult pancreas, it is proposed that these two factors regulate islet β-cell formation and maturation in a unique and sequential manner.
Analysis of Ras effector pathways in pancreatic cancer progression and maintenance
TL;DR: In this work, the PI3K target Pdk1 was shown to be essential for KrasG12D-driven progression of pancreatic intraepithelial neoplasia and maintenance of pancreatIC ductal adenocarcinoma in vitro and in vivo by serving an important role in controlling glucose metabolism.
Journal ArticleDOI
Enteroendocrine cell lineages that differentially control feeding and gut motility
Marito Hayashi,J A Kaye,Ella R. Douglas,Narendra Joshi,Fiona M. Gribble,Frank Reimann,Stephen D. Liberles +6 more
TL;DR: This work constructed Villin1-p2a-FlpO knock-in mice to restrict reporter expression to intestinal epithelium and through combined use of Cre and Flp alleles, effectively targeted major transcriptome-defined enteroendocrine cell lineages that produce serotonin, glucagon-like peptide 1, cholecystokinin, somatostatin, or glucose insulinotropic peptide.
References
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Journal ArticleDOI
Insulin-promoter-factor 1 is required for pancreas development in mice
TL;DR: The findings show that IPF1 is needed for the formation of the pancreas and suggest that it acts to determine the fate of common pancreatic precursor cells and/ or to regulate their propagation.
Journal ArticleDOI
Differentiation of Embryonic Stem Cells to Insulin-Secreting Structures Similar to Pancreatic Islets
Nadya Lumelsky,Olivier Blondel,Olivier Blondel,Pascal Laeng,Iván Velasco,Rea Ravin,Ronald D.G. McKay +6 more
TL;DR: This work generated cells expressing insulin and other pancreatic endocrine hormones from mouse ES cells that self-assemble to form three-dimensional clusters similar in topology to normal pancreatic islets where pancreatic cell types are in close association with neurons.
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PDX-1 is required for pancreatic outgrowth and differentiation of the rostral duodenum
Martin F. Offield,T. L. Jetton,Patricia A. Labosky,Michael Ray,Roland Stein,Mark A. Magnuson,Brigid L.M. Hogan,Christopher V.E. Wright +7 more
TL;DR: The pdx-1/beta-galactosidase fusion allele is expressed in pancreatic and duodenal cells in the absence of functional PDX-1, with expression continuing into perinatal stages with similar boundaries and expression levels, and offers additional insight into the role of p dx-1 in the determination and differentiation of the posterior foregut.
Journal ArticleDOI
Direct evidence for the pancreatic lineage: NGN3+ cells are islet progenitors and are distinct from duct progenitors.
TL;DR: The results provide direct evidence that NGN3+ cells are islet progenitors during embryogenesis and in adult mice, and suggest that lineages for exocrine, endocrine islet and duct progenitor are committed at mid-gestation.