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FAT/CD36 is localized in sarcolemma and in vesicle-like structures in subsarcolemma regions but not in mitochondria

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The primary aim of the present study was to investigate in which cellular compartments FAT/CD36 is localized. Intact and fully functional skeletal muscle mitochondria were isolated from lean and obese female Zucker rats and from 10 healthy male individuals. FAT/CD36 could not be detected in the isolated mitochondria, whereas the mitochondrial marker F1ATPase-beta was clearly detected using immunoblotting. Lack of markers for other membrane structures indicated that the mitochondria were not contaminated with membranes known to contain FAT/CD36 . In addition, fluorescence immunocytochemistry was performed on single muscle fibers dissected from soleus muscle of lean and obese Zucker rats and from the vastus lateralis muscle from humans. Co-staining against FAT/CD36 and MitoNEET clearly show that FAT/CD36 is highly present in sarcolemma and it also associates with some vesicle-like intracellular compartments. However, FAT/CD36 protein was not detected in mitochondrial membranes, supporting the biochemical findings. Based on the presented data FAT/CD36 seems to be abundantly expressed in sarcolemma and in vesicle-like structure throughout the muscle cell. However, FAT/CD36 was not present in mitochondria in rat or human skeletal muscle. Thus, the functional role of FAT/CD36 in lipid transport seems primarily to be allocated to the plasma membrane in skeletal muscle.
OriginalsprogEngelsk
TidsskriftJournal of Lipid Research
Vol/bind51
Udgave nummer6
Sider (fra-til)1504-1512
Antal sider9
ISSN0022-2275
DOI
StatusUdgivet - 2010

Bibliografisk note

CURIS 2010 5200 010

ID: 17111684