期刊
ARCHIVES OF PHYSIOLOGY AND BIOCHEMISTRY
卷 120, 期 1, 页码 12-21出版社
TAYLOR & FRANCIS LTD
DOI: 10.3109/13813455.2013.829105
关键词
Cholesterol biosynthesis; global gene analysis; glucose metabolism; mitochondrial oxidative capacity; oleic acid
资金
- University of Oslo
- Norwegian Diabetes foundation
- Anders Jahres Foundation
The role of peroxisome proliferator-activated receptor delta (PPAR delta) activation on global gene expression and mitochondrial fuel utilization were investigated in human myotubes. Only 21 genes were up-regulated and 3 genes were down-regulated after activation by the PPAR delta agonist GW501516. Pathway analysis showed up-regulated mitochondrial fatty acid oxidation, TCA cycle and cholesterol biosynthesis. GW501516 increased oleic acid oxidation and mitochondrial oxidative capacity by 2-fold. Glucose uptake and oxidation were reduced, but total substrate oxidation was not affected, indicating a fuel switch from glucose to fatty acid. Cholesterol biosynthesis was increased, but lipid biosynthesis and mitochondrial content were not affected. This study confirmed that the principal effect of PPAR delta activation was to increase mitochondrial fatty acid oxidative capacity. Our results further suggest that PPAR delta activation reduced glucose utilization through a switch in mitochondrial substrate preference by up-regulating pyruvate dehydrogenase kinase isozyme 4 and genes involved in lipid metabolism and fatty acid oxidation.
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