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Horm Metab Res 2013; 45(12): 880-886
DOI: 10.1055/s-0033-1348317
Original Basic
© Georg Thieme Verlag KG Stuttgart · New York

Activation of Receptors δ (PPARδ) by Agonist (GW0742) may Enhance Lipid Metabolism in Heart both In Vivo and In Vitro

S.-C. Kuo   *
1   Department of Ophthalmology, Chi-Mei Medical Center, Yong Kang, Tainan City, Taiwan
2   Department of Optometry, Chung Hwa University of Medical Technology, Jen-Teh, Tainan City, Taiwan
,
P.-M. Ku   *
3   Department of Cardiology, Chi-Mei Medical Center, Yong Kang, Tainan City, Taiwan
4   Department of Medical Research, Chi-Mei Medical Center, Yong Kang, Tainan City, Taiwan
,
L.-J. Chen
5   Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
,
H.-S. Niu
6   Department of Nursing, Tzu Chi College of Technology, Hualien City, Taiwan
,
J.-T. Cheng
4   Department of Medical Research, Chi-Mei Medical Center, Yong Kang, Tainan City, Taiwan
7   Department of Nutrition and Institute of Medical Science, College of Health Science, Chang Jung Christian University, Guei-Ren, Tainan City, Taiwan
› Author Affiliations
Further Information

Publication History

received 16 April 2013

accepted 21 May 2013

Publication Date:
26 June 2013 (online)

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Abstract

It has been documented that cardiac agents may regulate the lipid metabolism through increased expression of PPARδ in cardiac cells. However, the effect on lipid metabolism by direct activation of PPARδ is still unknown. The present study applied specific PPARδ agonist (GW0742) to investigate this point in the heart of Wistar rats and in the primary cultured cardiomyocytes from neonatal rat. Expressions of PPARδ in the heart and cardiomyocytes after treatment with GW0742 were detected using Western blots. The fatty acid (FA) oxidation and the citric acid (TCA) cycle related genes in cardiomyocytes were also examined. In addition, PPARδ antagonist (GSK0660) and siRNA-PPARδ were employed to characterize the potential mechanisms. After a 7-day treatment with GW0742, expressions of PPARδ in the heart were markedly increased. Increased expressions of FA oxidation and TCA cycle related genes were also observed both in vivo and in vitro. This action of GW0742 was blocked by GSK0660 or by siRNA-PPARδ. The obtained results show that activation of PPARδ by GW0742 is responsible for the increase of FA oxidation and TCA cycle related genes in hearts. Role of PPARδ in the regulation of lipid metabolism in heart is then established.

Key words

cardiomyocytes - digoxin - fatty acid oxidation - TCA cycle gene - PPARδ
*

* These authors contributed equally to this work.


 

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