AICA-riboside induces apoptosis of pancreatic beta cells through stimulation of AMP-activated protein kinase

被引:94
作者
Kefas, BA
Heimberg, H
Vaulont, S
Meisse, D
Hue, L
Pipeleers, D
Casteele, M
机构
[1] Free Univ Brussels VUB, Diabet Res Ctr, B-1090 Brussels, Belgium
[2] Univ Paris 05, CNRS, INSERM, Inst Cochin,Dept GDPM, F-75270 Paris, France
[3] Catholic Univ Louvain, Sch Med, Hormone & Metab Res Unit, B-1200 Brussels, Belgium
[4] Christian de Duve Int Inst Mol & Cellular Pathol, Brussels, Belgium
关键词
AICA-riboside; AICAR; AMP-activated protein kinase; AMPK; knockout; apoptosis; signalling; beta cell; glucose; diabetes;
D O I
10.1007/s00125-002-1030-3
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
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.
引用
收藏
页码:250 / 254
页数:5
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