Abstract
Evidence is accumulating that cellular lipid binding proteins are playing central roles in cellular lipid uptake and metabolism. Membrane-associated fatty acid-binding proteins putatively function in protein-mediated transmembrane transport of fatty acids, likely coexisting with passive diffusional uptake. The intracellular trafficking of fatty acids, bile acids, and other lipid ligands, may involve their interaction with specific membrane or protein targets, which are unique properties of some but not of all cytoplasmic lipid binding proteins. Recent studies indicate that these proteins not only facilitate but also regulate cellular lipid utilization. For instance, muscle fatty acid uptake is subject to short-term regulation by translocation of fatty acid translocase (FAT)/CD36 from intracellular storage sites to the plasma membrane, and liver-type cytoplasmic fatty acid-binding protein (L-FABPc) functions in long-term, ligand-induced regulation of gene expression by directly interacting with nuclear receptors. Therefore, the properties of the lipid-protein complex, rather than those of the lipid ligand itself, determine the fate of the ligand in the cell. Finally, there are an increasing number of reports that deficiencies or altered functioning of both membrane-associated and cytoplasmic lipid binding proteins are associated with disease states, such as obesity, diabetes and atherosclerosis. In conclusion, because of their central role in the regulation of lipid metabolism, cellular lipid binding proteins are promising targets for the treatment of diseases resulting from or characterised by disturbances in lipid metabolism, such as atherosclerosis, hyperlipidemia, and insulin resistance.
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Glatz, J.F., Luiken, J.J., van Bilsen, M. et al. Cellular lipid binding proteins as facilitators and regulators of lipid metabolism. Mol Cell Biochem 239, 3–7 (2002). https://doi.org/10.1023/A:1020529918782
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DOI: https://doi.org/10.1023/A:1020529918782