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Diabetologia
Erschienen in: Diabetologia 5/2005

01.05.2005 | Article

Troglitazone causes acute mitochondrial membrane depolarisation and an AMPK-mediated increase in glucose phosphorylation in muscle cells

verfasst von: D. Konrad, A. Rudich, P. J. Bilan, N. Patel, C. Richardson, L. A. Witters, A. Klip

Erschienen in: Diabetologia | Ausgabe 5/2005

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Abstract

Aims/hypothesis

Troglitazone was the first thiazolidinedione (TZD) approved for clinical use, exerting hypoglycaemic effects related to its action as a ligand of the peroxisome proliferator-activated receptor γ receptor in adipocytes. However, emerging evidence suggests that mitochondrial function may be affected by troglitazone, and that skeletal muscle cells acutely respond to troglitazone by enhancing glucose uptake. The aim of the present study was to determine the cellular mechanisms by which troglitazone acutely stimulates glucose utilisation in skeletal muscle cells.

Methods

L6 cells overexpressing GLUT4myc were incubated with troglitazone. Glucose uptake, transport and phosphorylation as well as AMP-activated protein kinase (AMPK) signalling and insulin signalling were examined. Changes in mitochondrial membrane potential were measured using the J-aggregate-forming dye JC-1. AMPK signalling was interfered with using AMPK α1/α2 siRNA.

Results

Troglitazone acutely (in 10 min) reduced the mitochondrial membrane potential in L6GLUT4myc myotubes and robustly stimulated AMPK activity. Following 30 min of incubation with troglitazone or insulin, 2-deoxyglucose uptake was stimulated 1.5- and 2.1-fold respectively, and in cells treated with troglitazone, a 1.8-fold increase in the 2-deoxyglucose-6-phosphate:2-deoxyglucose ratio was observed. Moreover, contrary to insulin, troglitazone did not significantly stimulate 3-O-methylglucose uptake. Unlike insulin, troglitazone did not increase surface GLUT4myc content and did not increase IRS1-associated phosphatidylinositol 3-kinase activity or Akt phosphorylation on T308 and S473. Interestingly, interfering with troglitazone-induced activation of AMPK by decreasing the expression of the enzyme using siRNA inhibited the stimulation of 2-deoxyglucose uptake by the TZD.

Conclusions/interpretation

We propose that troglitazone acutely increases glucose flux in muscle via an AMPK-mediated increase in glucose phosphorylation.
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Metadaten
Titel
Troglitazone causes acute mitochondrial membrane depolarisation and an AMPK-mediated increase in glucose phosphorylation in muscle cells
verfasst von
D. Konrad
A. Rudich
P. J. Bilan
N. Patel
C. Richardson
L. A. Witters
A. Klip
Publikationsdatum
01.05.2005
Erschienen in
Diabetologia / Ausgabe 5/2005
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI
https://doi.org/10.1007/s00125-005-1713-7

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