Role of BH3-Only Molecules Bim and Puma in β-Cell Death in Pdx1 Deficiency
| Autor: | Changzheng Wang, Honggang Ye, Kenneth S. Polonsky, Liqun Mao, Juan Sun, Emily H. Cheng, Decheng Ren, Graeme I. Bell |
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| Rok vydání: | 2014 |
| Předmět: |
endocrine system
Programmed cell death endocrine system diseases Endocrinology Diabetes and Metabolism Apoptosis Biology digestive system Cell Line Transcriptome Mice 03 medical and health sciences 0302 clinical medicine Downregulation and upregulation RNA interference Insulin-Secreting Cells Proto-Oncogene Proteins hemic and lymphatic diseases Puma Internal Medicine Animals RNA Messenger RNA Small Interfering 030304 developmental biology Homeodomain Proteins 0303 health sciences Bcl-2-Like Protein 11 Tumor Suppressor Proteins Lentivirus Membrane Proteins biology.organism_classification Molecular biology Up-Regulation Islet Studies Haplotypes Cell culture Gene Knockdown Techniques 030220 oncology & carcinogenesis Trans-Activators Cancer research PDX1 RNA Interference biological phenomena cell phenomena and immunity Apoptosis Regulatory Proteins |
| Zdroj: | Diabetes |
| ISSN: | 1939-327X 0012-1797 |
| Popis: | Mutations in pancreatic duodenal homeobox-1 (PDX1) are associated with diabetes in humans. Pdx1-haploinsufficient mice develop diabetes due to an increase in β-cell death leading to reduced β-cell mass. For definition of the molecular link between Pdx1 deficiency and β-cell death, Pdx1-haploinsufficient mice in which the genes for the BH3-only molecules Bim and Puma had been ablated were studied on a high-fat diet. Compared with Pdx1+/− mice, animals haploinsufficient for both Pdx1 and Bim or Puma genes showed improved glucose tolerance, enhanced β-cell mass, and reduction in the number of TUNEL-positive cells in islets. These results suggest that Bim and Puma ablation improves β-cell survival in Pdx1+/− mice. For exploration of the mechanisms responsible for these findings, Pdx1 gene expression was knocked down in mouse MIN6 insulinoma cells resulting in apoptotic cell death that was found to be associated with increased expression of BH3-only molecules Bim and Puma. If the upregulation of Bim and Puma that occurs during Pdx1 suppression was prevented, apoptotic β-cell death was reduced in vitro. These results suggest that Bim and Puma play an important role in β-cell apoptosis in Pdx1-deficient diabetes. |
| Databáze: | OpenAIRE |
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