Abstract
BACKGROUND:
Thiazolidinediones as PPARγ agonists and fibrates as PPARα agonists improve insulin sensitivity in insulin-responsive tissues. Recent data show an induction of adiponectin receptor 2 (AdipoR2) by PPARα and PPARγ agonists in human macrophages.
OBJECTIVE:
In this study, we examined the effects of thiazolidinediones and fibrates on the expression of adiponectin receptors in human skeletal muscle cells, an important cell type in the context of insulin resistance.
RESULTS AND METHODS:
In vitro differentiated human myotubes treated with troglitazone or rosiglitazone (20 h) showed no significant changes in AdipoR1 and AdipoR2 mRNA expression. PPARγ activation was controlled by determination of PPARγ mRNA induction. Likewise, differentiated myotubes treated with Wy-14,643 or fenofibrate (20 h) revealed no significant regulation of AdipoR1 and AdipoR2 mRNA. PPARα activation was assessed by measuring PDHK4 mRNA expression.
CONCLUSION:
Induction of AdipoR gene expression in human skeletal muscle cells is not involved in the insulin-sensitizing effects of thiazolidinediones or fibrates.
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Acknowledgements
We thank the research volunteers for their participation. This study was supported in part by grants from the Deutsche Forschungsgesellschaft (KFO 114/1-1) and the University of Tübingen (F1284193 fortüne program).
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Kaltenbach, S., Staiger, H., Weisser, M. et al. Adiponectin receptor gene expression in human skeletal muscle cells is not regulated by fibrates and thiazolidinediones. Int J Obes 29, 760–765 (2005). https://doi.org/10.1038/sj.ijo.0802957
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DOI: https://doi.org/10.1038/sj.ijo.0802957