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Diabetologia

Erschienen in:

01.11.2012 | Article

Acute exposure to resveratrol inhibits AMPK activity in human skeletal muscle cells

verfasst von: P. Skrobuk, S. von Kraemer, M. M. Semenova, A. Zitting, H. A. Koistinen

Erschienen in: Diabetologia | Ausgabe 11/2012

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Abstract

Aims/hypothesis

Recent studies have suggested resveratrol (RSV) as a new natural therapeutic agent to treat type 2 diabetes and lipid-induced insulin resistance. Here, we investigated whether RSV could reverse palmitate-induced insulin resistance in human primary muscle cells.

Methods

Myotubes obtained from six healthy men (54 ± 3 years (mean ± SE), BMI 25.0 ± 1.7 kg/m², fasting plasma glucose concentration (fP-glucose) 5.47 ± 0.09 mmol/l) were treated for 4 h with 100 μmol/l RSV and/or 0.2 mmol/l palmitate, and stimulated with or without 100 nmol/l insulin. Assays of glucose uptake, glycogen synthesis, palmitate oxidation, intracellular signalling and AMP-activated protein kinase (AMPK) activity were performed.

Results

RSV did not reverse palmitate-induced impairment of glucose metabolism. Surprisingly, RSV decreased glucose uptake and glycogen synthesis in human skeletal muscle cells. Palmitate oxidation and phosphorylation of AMPK and its downstream target acetyl-CoA carboxylase β (ACCβ) were inhibited by RSV, and RSV completely blocked the activity of AMPK isoform complexes α1/β2/γ1 and α2/β2/γ1 in in-vitro kinase activity assays. Endoplasmic reticulum (ER) stress was increased in response to RSV, as indicated by increased phosphorylation of eukaryotic initiation factor 2α (eIF2α) and increased expression of CCAAT/enhancer binding protein homologous protein (CHOP).

Conclusions/interpretation

Acute exposure to RSV inhibits AMPK activity, fatty-acid oxidation and glucose metabolism in human myotubes.

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Titel: Acute exposure to resveratrol inhibits AMPK activity in human skeletal muscle cells
verfasst von: P. Skrobuk
S. von Kraemer
M. M. Semenova
A. Zitting
H. A. Koistinen
Publikationsdatum: 01.11.2012
Verlag: Springer-Verlag
Erschienen in: Diabetologia / Ausgabe 11/2012
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-012-2691-1

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