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01.05.2008 | Article

Adiponectin induces insulin secretion in vitro and in vivo at a low glucose concentration

verfasst von: M. Okamoto, M. Ohara-Imaizumi, N. Kubota, S. Hashimoto, K. Eto, T. Kanno, T. Kubota, M. Wakui, R. Nagai, M. Noda, S. Nagamatsu, T. Kadowaki

Erschienen in: Diabetologia | Ausgabe 5/2008

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Abstract

Aims/hypothesis

A decrease in plasma adiponectin levels has been shown to contribute to the development of diabetes. However, it remains uncertain whether adiponectin plays a role in the regulation of insulin secretion. In this study, we investigated whether adiponectin may be involved in the regulation of insulin secretion in vivo and in vitro.

Methods

The effect of adiponectin on insulin secretion was measured in vitro and in vivo, along with the effects of adiponectin on ATP generation, membrane potentials, Ca²⁺ currents, cytosolic calcium concentration and state of 5′-AMP-activated protein kinase (AMPK). In addition, insulin granule transport was measured by membrane capacitance and total internal reflection fluorescence (TIRF) analysis.

Results

Adiponectin significantly stimulated insulin secretion from pancreatic islets to approximately 2.3-fold the baseline value in the presence of a glucose concentration of 5.6 mmol/l. Although adiponectin had no effect on ATP generation, membrane potentials, Ca²⁺ currents, cytosolic calcium concentrations or activation status of AMPK, it caused a significant increase of membrane capacitance to approximately 2.3-fold the baseline value. TIRF analysis revealed that adiponectin induced a significant increase in the number of fusion events in mouse pancreatic beta cells under 5.6 mmol/l glucose loading, without affecting the status of previously docked granules. Moreover, intravenous injection of adiponectin significantly increased insulin secretion to approximately 1.6-fold of baseline in C57BL/6 mice.

Conclusions/interpretation

The above results indicate that adiponectin induces insulin secretion in vitro and in vivo.

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Titel: Adiponectin induces insulin secretion in vitro and in vivo at a low glucose concentration
verfasst von: M. Okamoto
M. Ohara-Imaizumi
N. Kubota
S. Hashimoto
K. Eto
T. Kanno
T. Kubota
M. Wakui
R. Nagai
M. Noda
S. Nagamatsu
T. Kadowaki
Publikationsdatum: 01.05.2008
Verlag: Springer-Verlag
Erschienen in: Diabetologia / Ausgabe 5/2008
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-008-0944-9

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