sept7b is required for the differentiation of pancreatic endocrine progenitors

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Dash , S , Hakonen , E , Ustinov , J , Otonkoski , T , Andersson , O & Lehtonen , S 2016 , ' sept7b is required for the differentiation of pancreatic endocrine progenitors ' , Scientific Reports , vol. 6 , 24992 . https://doi.org/10.1038/srep24992

Title: sept7b is required for the differentiation of pancreatic endocrine progenitors
Author: Dash, Surjya; Hakonen, Elina; Ustinov, Jarkko; Otonkoski, Timo; Andersson, Olov; Lehtonen, Sanna
Contributor: University of Helsinki, Medicum
University of Helsinki, Research Programs Unit
University of Helsinki, Research Programs Unit
University of Helsinki, Research Programs Unit
University of Helsinki, Medicum
Date: 2016-04-26
Language: eng
Number of pages: 14
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/175348
Abstract: Protection or restoration of pancreatic beta-cell mass as a therapeutic treatment for type 1 diabetes requires understanding of the mechanisms that drive the specification and development of pancreatic endocrine cells. Septins are filamentous small GTPases that function in the regulation of cell division, cytoskeletal organization and membrane remodeling, and are involved in various tissue-specific developmental processes. However, their role in pancreatic endocrine cell differentiation remains unknown. Here we show by functional manipulation techniques in transgenic zebrafish lines that suppression of sept7b, the zebrafish ortholog of human SEPT7, profoundly increases the number of endocrine progenitors but limits their differentiation, leading to reduction in beta- and alpha-cell mass. Furthermore, we discovered that shh (sonic hedgehog) expression in the endoderm, essential for the development of pancreatic progenitors of the dorsal pancreatic bud, is absent in larvae depleted of sept7b. We also discovered that sept7b is important for the differentiation of ventral pancreatic bud-derived cells: sept7b-depleted larvae exhibit downregulation of Notch receptors notch1a and notch1b and show precocious differentiation of NeuroD-positive endocrine cells in the intrapancreatic duct and gut epithelium. Collectively, this study provides a novel insight into the development of pancreatic endocrine progenitors, revealing an essential role for sept7b in endocrine progenitor differentiation.
Subject: SONIC-HEDGEHOG
PRIMARY CILIUM
ZEBRAFISH
CELLS
SPECIFICATION
GLUCAGON
SEPTINS
MOUSE
ORGANOGENESIS
MORPHOGENESIS
3111 Biomedicine
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