Betacellulin overexpression in transgenic mice improves glucose tolerance and enhances insulin secretion by isolated islets in vitro
| Autor: | Andreas Lechner, L van Bürck, Marlon R. Schneider, Nadja Herbach, Ruediger Wanke, Eckhard Wolf, Petra Dames, Maik Dahlhoff |
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| Rok vydání: | 2009 |
| Předmět: |
Genetically modified mouse
medicine.medical_specialty Transgene medicine.medical_treatment Apoptosis Mice Transgenic Cell Separation Biology Carbohydrate metabolism Biochemistry Islets of Langerhans Mice Endocrinology Internal medicine Insulin Secretion medicine Animals Homeostasis Insulin Transgenes Betacellulin Molecular Biology Cell Proliferation Glucose tolerance test geography geography.geographical_feature_category medicine.diagnostic_test Islet Glucose Intercellular Signaling Peptides and Proteins |
| Zdroj: | Molecular and Cellular Endocrinology. 299:188-193 |
| ISSN: | 0303-7207 |
| DOI: | 10.1016/j.mce.2008.11.022 |
| Popis: | Betacellulin (BTC), a ligand of the epidermal growth factor receptor, has been shown to promote growth and differentiation of pancreatic beta-cells and to improve glucose metabolism in experimental diabetic rodent models. We employed transgenic mice (BTC-tg) to investigate the effects of long-term BTC overabundance on islet structure and glucose metabolism. Expression of BTC is increased in transgenic islets, which show normal structure and distribution of the different endocrine cell types, without pathological alterations. BTC-tg mice exhibit lower fasted glucose levels and improved glucose tolerance associated with increased glucose-induced insulin secretion. Surprisingly, quantitative stereological analyses revealed that, in spite of increased cell proliferation, the islet and beta-cell volumes were unchanged in BTC-tg mice, suggesting enhanced cell turnover. Insulin secretion in vitro was significantly higher in transgenic islets in medium containing high glucose (11.2 or 16.7mM) as compared to control islets. Our results demonstrate that long-term BTC overabundance does not alter pancreatic islet structure and beta-cell mass, but enhances glucose-induced insulin secretion in vivo as well as in vitro. |
| Databáze: | OpenAIRE |
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