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The Journal of Lipid Research
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The Journal of Lipid Research
Article
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The Journal of Lipid Research
Article . 2011
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Contraction-induced skeletal muscle FAT/CD36 trafficking and FA uptake is AMPK independent

Authors: Jeppesen, Jacob; Albers, Peter Hjorth; Rose, Adam John; Birk, Jesper Bratz; Schjerling, Peter; Dzamko, Nicolas; Steinberg, Gregory R.; +1 Authors

Contraction-induced skeletal muscle FAT/CD36 trafficking and FA uptake is AMPK independent

Abstract

The aim of this study was to investigate the molecular mechanisms regulating FA translocase CD36 (FAT/CD36) translocation and FA uptake in skeletal muscle during contractions. In one model, wild-type (WT) and AMP-dependent protein kinase kinase dead (AMPK KD) mice were exercised or extensor digitorum longus (EDL) and soleus (SOL) muscles were contracted, ex vivo. In separate studies, FAT/CD36 translocation and FA uptake in response to muscle contractions were investigated in the perfused rat hindlimb. Exercise induced a similar increase in skeletal muscle cell surface membrane FAT/CD36 content in WT (+34%) and AMPK KD (+37%) mice. In contrast, 5-aminoimidazole-4-carboxamide ribonucleoside only induced an increase in cell surface FAT/CD36 content in WT (+29%) mice. Furthermore, in the perfused rat hindlimb, muscle contraction induced a rapid (1 min, +15%) and sustained (10 min, +24%) FAT/CD36 relocation to cell surface membranes. The increase in cell surface FAT/CD36 protein content with muscle contractions was associated with increased FA uptake, both in EDL and SOL muscle from WT and AMPK KD mice and in the perfused rat hindlimb. This suggests that AMPK is not essential in regulation of FAT/CD36 translocation and FA uptake in skeletal muscle during contractions. However, AMPK could be important in regulation of FAT/CD36 distribution in other physiological situations.

Keywords

CD36 Antigens, Male, 570, 610, Mice, Transgenic, QD415-436, AMP-Activated Protein Kinases, In Vitro Techniques, Biochemistry, Mice, trafficking, Physical Conditioning, Animal, Animals, AMP-dependent protein kinase, Muscle, Skeletal, fatty acid translocase CD36, Fatty Acids, Biological Transport, Aminoimidazole Carboxamide, Rats, Mice, Inbred C57BL, Protein Transport, fatty acid metabolism, Ribonucleosides, Muscle Contraction

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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
67
Top 10%
Top 10%
Top 10%
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