Document Detail


Transport of long-chain fatty acids across the muscular endothelium.
MedLine Citation:
PMID:  9781325     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Both skeletal and cardiac muscle cells rely heavily on the oxidation of long-chain fatty acids to utilize chemically stored energy for contractile work. Under normal conditions fatty acids are continuously supplied from the microvascular compartment to the contracting myocytes. Exogenous fatty acids are transported to muscle tissue via the blood either complexed to albumin or covalently bound in triacylglycerols forming the neutral lipid core of circulating lipoproteins such as chylomicrons or very low-density lipoproteins. The first barrier met by fatty acids on their way from the vascular compartment to the myocytes is the endothelium constituting the capillary wall. After dissociation of the albumin-fatty acid complex or release from the triacylglycerol core of lipoproteins, fatty acids most likely transverse the endothelium by crossing the luminal membrane, the cytosol, and subsequently the abluminal wall of the endothelial cell. Transfer through the interendothelial clefts or lateral diffusion within the phospholipid bilayer of the endothelial plasmalemma should be considered as inconsequential. The mechanism responsible for transmembrane movement of fatty acids is incompletely understood, although recent findings suggest the involvement of a number of membrane-associated proteins. Kinetic studies have revealed that interaction of the albumin-fatty acid complex with the endothelial membrane may accelerate the dissociation of the complex, which facilitates the uptake of fatty acids by the endothelium. Albumin-binding proteins (ABP) might be instrumental in this interaction. Moreover, plasmalemmal fatty acid-binding protein (FABPpm), fatty acid translocase (FAT) and fatty acid-transport protein (FATP) are putatively involved in transmembrane movement of the fatty acid molecules. Diffusion through the endothelial cytosol might be facilitated by a cytoplasmic fatty acid-binding protein, the type of which may be related to the epithelial fatty acid-binding protein (E-FAPBc).
Authors:
G J Van der Vusse; J F Glatz; F A Van Nieuwenhoven; R S Reneman; J B Bassingthwaighte
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Advances in experimental medicine and biology     Volume:  441     ISSN:  0065-2598     ISO Abbreviation:  Adv. Exp. Med. Biol.     Publication Date:  1998  
Date Detail:
Created Date:  1998-12-01     Completed Date:  1998-12-01     Revised Date:  2014-09-08    
Medline Journal Info:
Nlm Unique ID:  0121103     Medline TA:  Adv Exp Med Biol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  181-91     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Biological Transport
Endothelium, Vascular / metabolism*
Fatty Acids / metabolism*
Humans
Muscle, Skeletal / blood supply,  metabolism*
Grant Support
ID/Acronym/Agency:
P41 RR001243/RR/NCRR NIH HHS; P41 RR001243-21/RR/NCRR NIH HHS
Chemical
Reg. No./Substance:
0/Fatty Acids

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