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    
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.
Adrian Chabowski; Jan Górski; Jorge Calles-Escandon; Narendra N Tandon; Arend Bonen
Related Documents :
11910349 - Heat stress prevents impairment of bile acid transport in endotoxemic rats by a posttra...
16295849 - Role of organic acids in promoting colloidal transport of mercury from mine tailings.
6863319 - Brain microvessels take up large neutral amino acids in exchange for glutamine. coopera...
2559359 - Involvement of sulfhydryl groups in the transport of l-tyrosine and l-tryptophan across...
15837069 - Fetoplacental transport and utilization of amino acids in iugr--a review.
11182559 - 3-[123i]iodo-alpha-methyl-l-tyrosine transport and 4f2 antigen expression in human glio...
4030759 - Metabolism of all-trans-retinoic acid and all-trans-retinyl acetate. demonstration of c...
18835159 - Nodapa-oh and nodapa-(ncs)n: synthesis, 68ga-radiolabelling and in vitro characterisati...
18493809 - Hydrolysis of acyl-homogeneous and fish oil triacylglycerols using desalted midgut extr...
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    
Department of Physiology, Medical University of Bialystok, ul. Mickiewicza 2C, 15-089 Bialystok, Poland.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
AMP-Activated Protein Kinases
Anoxia / metabolism*
Biological Transport
Fatty Acid Transport Proteins / metabolism*
Fatty Acids / metabolism*
Lipid Metabolism*
Multienzyme Complexes / metabolism
Myocardium / metabolism*
Palmitates / metabolism
Protein Transport
Protein-Serine-Threonine Kinases / metabolism
Rats, Wistar
Signal Transduction
Subcellular Fractions
Reg. No./Substance:
0/Fatty Acid Transport Proteins; 0/Fatty Acids; 0/Multienzyme Complexes; 0/Palmitates; EC Protein Kinases; EC Kinases

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

Previous Document:  Polo-like kinase 1 regulates mitotic arrest after UV irradiation through dephosphorylation of p53 an...
Next Document:  Expression and functional characterization of the putative protein 8b of the severe acute respirator...