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01.04.2009 | Article

Increased insulin demand promotes while pioglitazone prevents pancreatic beta cell apoptosis in Wfs1 knockout mice

verfasst von: M. Akiyama, M. Hatanaka, Y. Ohta, K. Ueda, A. Yanai, Y. Uehara, K. Tanabe, M. Tsuru, M. Miyazaki, S. Saeki, T. Saito, K. Shinoda, Y. Oka, Y. Tanizawa

Erschienen in: Diabetologia | Ausgabe 4/2009

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Abstract

Aims/hypothesis

The WFS1 gene encodes an endoplasmic reticulum (ER) membrane-embedded protein called Wolfram syndrome 1 protein, homozygous mutations of which cause selective beta cell loss in humans. The function(s) of this protein and the mechanism by which the mutations of this gene cause beta cell death are still not fully understood. We hypothesised that increased insulin demand as a result of obesity/insulin resistance causes ER stress in pancreatic beta cells, thereby promoting beta cell death.

Methods

We studied the effect of breeding Wfs1 ^−/− mice on a C57BL/6J background with mild obesity and insulin resistance, by introducing the agouti lethal yellow mutation (A ^y /a). We also treated the mice with pioglitazone.

Results

Wfs1 ^−/− mice bred on a C57BL/6J background rarely develop overt diabetes by 24 weeks of age, showing only mild beta cell loss. However, Wfs1 ^−/− A ^y /a mice developed selective beta cell loss and severe insulin-deficient diabetes as early as 8 weeks. This beta cell loss was due to apoptosis. In Wfs1 ^+/+ A ^y /a islets, levels of ER chaperone immunoglobulin-binding protein (BiP)/78 kDa glucose-regulated protein (GRP78) and phosphorylation of eukaryotic translation initiation factor 2, subunit α (eIF2α) apparently increased. Levels of both were further increased in Wfs1 ^−/− A ^y /a murine islets. Electron micrography revealed markedly dilated ERs in Wfs1 ^−/− A ^y /a murine beta cells. Interestingly, pioglitazone treatment protected beta cells from apoptosis and almost completely prevented diabetes development.

Conclusions/interpretation

Wfs1-deficient beta cells are susceptible to ER stress. Increased insulin demand prompts apoptosis in such cells in vivo. Pioglitazone, remarkably, suppresses this process and prevents diabetes. As common WFS1 gene variants have recently been shown to confer a risk of type 2 diabetes, our findings may be relevant to the gradual but progressive loss of beta cells in type 2 diabetes.

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Titel: Increased insulin demand promotes while pioglitazone prevents pancreatic beta cell apoptosis in Wfs1 knockout mice
verfasst von: M. Akiyama
M. Hatanaka
Y. Ohta
K. Ueda
A. Yanai
Y. Uehara
K. Tanabe
M. Tsuru
M. Miyazaki
S. Saeki
T. Saito
K. Shinoda
Y. Oka
Y. Tanizawa
Publikationsdatum: 01.04.2009
Verlag: Springer-Verlag
Erschienen in: Diabetologia / Ausgabe 4/2009
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-009-1270-6

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