Abstract
The heart is the most fatty acid-dependent muscle in mammals, but flight muscles of birds and insects encounter even higher rates of fatty acid oxidation. The amount of the muscle fatty acid binding protein (H-FABP) found in these muscle reflects their metabolic activities, and increased fatty acid metabolism in endurance exercise increases FABP expression further. We have studied the mechanism of fatty acid-dependent expression of the H-FABP gene, taking advantage of the comparative analysis of gene control in functionally related, but evolutionary distant animal systems, i.e., rat heart and locust flight muscle. Luciferase reporter genes with a full-length promoter (∼1 kb) from either the locust or the rat were strongly expressed in L6 myoblasts, and the expression of both constructs was markedly increased by fatty acid treatment. Because of its stronger induction by fatty acids and the absence of other vertebrate transcription factor binding sites, the locust promoter was advantageous for the identification of a fatty acid response element (FARE), an inverted repeat of a hexanucleotide half site reminiscent of steroid hormone receptor binding sites (IR-3). All mammalian H-FABP promoters contain similar sequences, however in reverse orientation (everted repeats, ER-3). Deletion of the FARE eliminated the fatty acid inducibility completely for the locust promoter, but only partly for its mammalian analogue, perhaps because of additional factors or more complex interactions. In gel shift studies, the element binds nuclear proteins from both rat cells and locust flight muscle, further attesting to the far-reaching conservation of this mechanism. Two individual proteins bind to the element, with full binding requiring the presence of free fatty acid. Antibodies to PPARs failed to induce a supershift of the protein-DNA complex, indicating that other transcription factors are responsible for the fatty acid-mediated induction of gene expression of H-FABP.
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Qu, H., Cui, L., Rickers-Haunerland, J. et al. Fatty acid-dependent expression of the muscle FABP gene – comparative analysis of gene control in functionally related, but evolutionary distant animal systems. Mol Cell Biochem 299, 45–53 (2007). https://doi.org/10.1007/s11010-005-9036-z
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DOI: https://doi.org/10.1007/s11010-005-9036-z