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Intracellular transport of lipids

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Summary

Translocation of lipids inside mammalian cells is considered to be facilitated by a number of low-molecular weight lipid binding proteins. An overview of these proteins is given, with particular reference to the heart. Three distinct phospholipid transfer proteins specifically stimulate the net transfer of individual phospholipid classes between membrane structures. In rat cardiac muscle their content is 15–140 pmol/g ww. Fatty acid-binding proteins (FABP) are abundantly present in tissues actively involved in the uptake or utilization of long-chain fatty acids, such as intestine, liver and heart. The four distinct FABP types now identified show a complex tissue distribution with some tissues containing more than one type. Heart (H-) FABP comprises about 5% of the cytosolic protein mass; its content in rat heart is 100 nmol/g ww. Immunochemical evidence has been obtained for the presence of H-FABP in several other tissues, including red skeletal muscle, mammary gland and kidney. Beside long-chain fatty acids FABP binds with similar affinity also fatty acyl-CoA and acyl-L-carnitines. In heart the latter compound may be the primary ligand, since normoxic acyl-L-carnitine levels are several fold higher than those of fatty acids. In addition, H-FABP was found to modulate cardiac energy production by controlling the transfer of acyl-L-carnitine to the mitochondrial β-oxidative system. H-FABP may also protect the heart against the toxic effects of high intracellular levels of fatty acid intermediates that arise during ischemia.

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  1. Department of Physiology, University of Limburg, Maastricht, The Netherlands

    Jan F. C. Glatz & Ger J. van der Vusse

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  1. Jan F. C. Glatz
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  2. Ger J. van der Vusse
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Glatz, J.F.C., van der Vusse, G.J. Intracellular transport of lipids. Mol Cell Biochem 88, 37–44 (1989). https://doi.org/10.1007/BF00223421

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