| AICA-riboside induces apoptosis of pancreatic beta cells through stimulation of AMP-activated protein kinase. | |
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MedLine Citation:
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PMID: 12627324 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIMS/HYPOTHESIS: Prolonged exposure of beta cells to low glucose concentrations triggers their apoptosis and is known to activate AMP-activated protein kinase (AMPK) in beta cell lines. We examined whether prolonged activation of AMPK can trigger apoptosis in rodent beta cells. METHODS: Primary beta cells were FACS-purified from rats, and from wild-type and AMPK(alpha2)-deficient mice. AMPK activation in beta cells was induced by the adenosine analog AICA-riboside and detected by immunoblotting using a phosphospecific antibody. Apoptosis of rodent beta cells was monitored by FACS analysis of beta cell DNA content, by direct counting of apoptotic cells using fluorescence microscopy, or by measurement of their caspase-3 activity. RESULTS: Dose-dependent and time-dependent apoptosis of the cells, concommittant with an activation of caspase-3, were suppressed by the caspase inhibitors zVAD-fmk and zDEVD-fmk. Apoptosis induction by AICA-riboside was also prevented by adding the MAPK-inhibitor SB203580 which blocked the AICA-riboside-induced phosphorylation of AMPK. Beta cells isolated from AMPK-(alpha2)-deficient mice were resistant against AICA-riboside induced apoptosis. CONCLUSION/INTERPRETATION: Sustained activation of AMPK by AICA-riboside can trigger a caspase-dependent apoptosis of pancreatic beta cells. |
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Authors:
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B A Kefas; H Heimberg; S Vaulont; D Meisse; L Hue; D Pipeleers; M Van de Casteele |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2003-02-08 |
Journal Detail:
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Title: Diabetologia Volume: 46 ISSN: 0012-186X ISO Abbreviation: Diabetologia Publication Date: 2003 Feb |
Date Detail:
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Created Date: 2003-03-10 Completed Date: 2003-12-05 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0006777 Medline TA: Diabetologia Country: Germany |
Other Details:
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Languages: eng Pagination: 250-4 Citation Subset: IM |
Affiliation:
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Diabetes Research Center, Free Brussels University-VUB, Laarbeeklaan 103, 1090 Brussels, Belgium. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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AMP-Activated Protein Kinases Aminoimidazole Carboxamide / analogs & derivatives*, pharmacology* Animals Apoptosis* Caspase 3 Caspases / metabolism Cells, Cultured Enzyme Activation Islets of Langerhans / drug effects*, physiology* Mice Multienzyme Complexes / deficiency, metabolism* Protein-Serine-Threonine Kinases / deficiency, metabolism* Rats Ribonucleosides / pharmacology* |
| Chemical | |
Reg. No./Substance:
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0/Multienzyme Complexes; 0/Ribonucleosides; 2627-69-2/acadesine; 360-97-4/Aminoimidazole Carboxamide; EC 2.7.11.1/AMP-Activated Protein Kinases; EC 2.7.11.1/Protein-Serine-Threonine Kinases; EC 3.4.22.-/Casp3 protein, mouse; EC 3.4.22.-/Casp3 protein, rat; EC 3.4.22.-/Caspase 3; EC 3.4.22.-/Caspases |
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