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Erschienen in: Diabetologia 7/2004

01.07.2004 | Article

WY-14643 and 9-cis-retinoic acid induce IRS-2/PI 3-kinase signalling pathway and increase glucose transport in human skeletal muscle cells: differential effect in myotubes from healthy subjects and Type 2 diabetic patients

verfasst von: K. Bouzakri, M. Roques, C. Debard, V. Berbe, J. Rieusset, M. Laville, H. Vidal

Erschienen in: Diabetologia | Ausgabe 7/2004

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Abstract

Aims/hypothesis

To determine the effects of peroxisome proliferator-activated receptor α (PPARα) and retinoid X receptor (RXR) agonists on insulin action, we investigated the effects of Wy-14643 and 9-cis-retinoic acid (9-cis-RA) on insulin signalling and glucose uptake in human myotubes.

Methods

Primary cultures of differentiated human skeletal muscle cells, established from healthy subjects and Type 2 diabetic patients, were used to study the effects of Wy-14643 and 9-cis-RA on the expression and activity of proteins involved in the insulin signalling cascade. Glucose transport was assessed by measuring the rate of [3H]2-deoxyglucose uptake.

Results

Wy-14643 and 9-cis-RA increased IRS-2 and p85α phosphatidylinositol 3-kinase (PI 3-kinase) mRNA and protein expression in myotubes from non-diabetic and Type 2 diabetic subjects. This resulted in increased insulin stimulation of protein kinase B phosphorylation and increased glucose uptake in cells from control subjects. Myotubes from diabetic patients displayed marked alterations in the stimulation by insulin of the IRS-1/PI 3-kinase pathway. These alterations were associated with blunted stimulation of glucose transport. Treatment with Wy-14643 and 9-cis-RA did not restore these defects but increased the basal rate of glucose uptake.

Conclusions/interpretation

These results demonstrate that PPARα and RXR agonists can directly affect insulin signalling in human muscle cells. They also indicate that an increase in the IRS-2/PI 3-kinase pathway does not overcome the impaired stimulation of the IRS-1-dependent pathway and does not restore insulin-stimulated glucose uptake in myotubes from Type 2 diabetic patients.
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Metadaten
Titel
WY-14643 and 9-cis-retinoic acid induce IRS-2/PI 3-kinase signalling pathway and increase glucose transport in human skeletal muscle cells: differential effect in myotubes from healthy subjects and Type 2 diabetic patients
verfasst von
K. Bouzakri
M. Roques
C. Debard
V. Berbe
J. Rieusset
M. Laville
H. Vidal
Publikationsdatum
01.07.2004
Verlag
Springer Berlin Heidelberg
Erschienen in
Diabetologia / Ausgabe 7/2004
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI
https://doi.org/10.1007/s00125-004-1428-1

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