Abstract
Previous studies with cardiac myocytes from homozygous heart-type fatty acid (FA)-binding protein (H-FABP)−/− mice have indicated that this intracellular: receptor protein for long-chain FA is involved in the cellular uptake of these substrates. Based on the knowledge that muscle FA uptake is a process highly sensitive to regulation by hormonal and mechanical stimuli, we studied whether H-FABP would play a role in this regulation. A suitable model system to answer this question is provided by H-FABP+/− mice, because in hindlimb muscles the content of H-FABP was measured to be 34% compared to wild-type mice. In these H-FABP+/− skeletal muscles, just as in H-FABP−/− muscles, contents of FA transporters, i.e., 43-kDa FABPpm and 88-kDa FAT/CD36, were similar compared to wild-type muscles, excluding possible compensatory mech-anisms at the sarcolemmal level. Palmitate uptake rates were measured in giant vesicles prepared from hindlimb muscles of H-FABP−/−, H-FABP+/− and H-FABP+/+ mice. For comparison, giant vesicles were isolated from liver, the tissue of which expresses a distinct type of FABP (i.e., L-FABP). Whereas in H-FABP−/− skeletal muscle FA uptake was reduced by 42–45%, FA uptake by H-FABP+/− skeletal muscle was not different from that in wild-type mice. In contrast, in liver from H-FABP−/− and from H-FABP+/− mice, FA uptake was not altered compared to wild-type animals, indicating that changes in FA uptake are restricted to H-FABP expressing tissues. It is concluded that H-FABP plays an important, yet merely permissive, role in FA uptake into muscle tissues.
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Abbreviations
- ECL:
-
enhanced chemiluminescence
- FA:
-
fatty acid
- FABP:
-
fatty acid-binding protein
- FABPpm:
-
plasma membrane FABP
- FAT:
-
FA translocase
- H-FABP:
-
heart-type FABP
- L-FABP:
-
liver-type FABP
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Luiken, J.J.F.P., Koonen, D.P.Y., Coumans, W.A. et al. Long-chain fatty acid uptake by skeletal muscle is impaired in homozygous, but not heterozygous, heart-type-FABP null mice. Lipids 38, 491–496 (2003). https://doi.org/10.1007/s11745-003-1089-6
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DOI: https://doi.org/10.1007/s11745-003-1089-6