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- W2015874443 abstract "The TGF-β superfamily of ligands provides important signals for the development of pancreas islets. However, it is not yet known whether the TGF-β family signalling pathway is required for essential islet functions in the adult pancreas.To identify distinct roles for the downstream components of the canonical TGF-β signalling pathway, a Cre-loxP system was used to disrupt SMAD2, an intracellular transducer of TGF-β signals, in pancreatic beta cells (i.e. Smad2β knockout [KO] mice). The activity of ATP-sensitive K(+) channels (KATP channels) was recorded in mutant beta cells using patch-clamp techniques.The Smad2βKO mice exhibited defective insulin secretion in response to glucose and overt diabetes. Interestingly, disruption of SMAD2 in beta cells was associated with a striking islet hyperplasia and increased pancreatic insulin content, together with defective glucose-responsive insulin secretion. The activity of KATP channels was decreased in mutant beta cells.These results suggest that in the adult pancreas, TGF-β signalling through SMAD2 is crucial for not only the determination of beta cell mass but also the maintenance of defining features of mature pancreatic beta cells, and that this involves modulation of KATP channel activity." @default.
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- W2015874443 date "2013-09-26" @default.
- W2015874443 modified "2023-10-13" @default.
- W2015874443 title "SMAD2 disruption in mouse pancreatic beta cells leads to islet hyperplasia and impaired insulin secretion due to the attenuation of ATP-sensitive K+ channel activity" @default.
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- W2015874443 doi "https://doi.org/10.1007/s00125-013-3062-2" @default.
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