Document Detail


Hypoxia-induced fatty acid transporter translocation increases fatty acid transport and contributes to lipid accumulation in the heart.
MedLine Citation:
PMID:  16753149     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Protein-mediated LCFA transport across plasma membranes is highly regulated by the fatty acid transporters FAT/CD36 and FABPpm. Physiologic stimuli (insulin stimulation, AMP kinase activation) induce the translocation of one or both transporters to the plasma membrane and increase the rate of LCFA transport. In the hypoxic/ischemic heart, intramyocardial lipid accumulation has been attributed to a reduced rate of fatty acid oxidation. However, since acute hypoxia (15 min) activates AMPK, we examined whether an increased accumulation of intramyocardial lipid during hypoxia was also attributable to an increased rate of LCFA uptake as a result AMPK-induced translocation of FAT/CD36 and FABPpm. In cardiac myocytes, hypoxia (15 min) induced the redistribution of FAT/CD36 from an intracellular pool (LDM) (-25%, P<0.05) to the plasma membranes (PM) (+54%, P<0.05). Hypoxia also induced an increase in FABPpm at the PM (+56%, P<0.05) and a concomitant FABPpm reduction in the LDM (-24%, P<0.05). Similarly, in intact, Langendorff perfused hearts, hypoxia induced the translocation of a both FAT/CD36 and FABPpm to the PM (+66% and +61%, respectively, P<0.05), with a concomitant decline in FAT/CD36 and FABPpm in the LDM (-24% and -23%, respectively, P<0.05). Importantly, the increased plasmalemmal content of these transporters was associated with increases in the initial rates of palmitate uptake into cardiac myocytes (+40%, P<0.05). Acute hypoxia also redirected palmitate into intracellular lipid pools, mainly to PL and TG (+48% and +28%, respectively, P<0.05), while fatty acid oxidation was reduced (-35%, P<0.05). Thus, our data indicate that the increased intracellular lipid accumulation in hypoxic hearts is attributable to both: (a) a reduced rate of fatty acid oxidation and (b) an increased rate of fatty acid transport into the heart, the latter being attributable to a hypoxia-induced translocation of fatty acid transporters.
Authors:
Adrian Chabowski; Jan Górski; Jorge Calles-Escandon; Narendra N Tandon; Arend Bonen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-05-30
Journal Detail:
Title:  FEBS letters     Volume:  580     ISSN:  0014-5793     ISO Abbreviation:  FEBS Lett.     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-20     Completed Date:  2006-08-08     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0155157     Medline TA:  FEBS Lett     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  3617-23     Citation Subset:  IM    
Affiliation:
Department of Physiology, Medical University of Bialystok, ul. Mickiewicza 2C, 15-089 Bialystok, Poland. adrian@amb.edu.pl
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MeSH Terms
Descriptor/Qualifier:
AMP-Activated Protein Kinases
Animals
Anoxia / metabolism*
Biological Transport
Fatty Acid Transport Proteins / metabolism*
Fatty Acids / metabolism*
Lipid Metabolism*
Male
Multienzyme Complexes / metabolism
Myocardium / metabolism*
Palmitates / metabolism
Phosphorylation
Protein Transport
Protein-Serine-Threonine Kinases / metabolism
Rats
Rats, Wistar
Signal Transduction
Subcellular Fractions
Chemical
Reg. No./Substance:
0/Fatty Acid Transport Proteins; 0/Fatty Acids; 0/Multienzyme Complexes; 0/Palmitates; EC 2.7.11.1/AMP-Activated Protein Kinases; EC 2.7.11.1/Protein-Serine-Threonine Kinases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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