Summary
Oxidation of branched-chain amino acids, leucine, isoleucine and valine, is thought to occur primarily in muscle. Theoretically, however, it is possible for valine carbon to be converted to glucose, a process which only occurs in liver and kidney. We provide evidence that valine is oxidixed toβ-hydroxyisobutyrate in muscle, and that this intermediate is released from muscle and taken up by liver and kidney for subsequent conversion to glucose, thus conserving the gluconeogenic potential of valine.
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This research was supported by grants from the Medical Research Council of Canada and the Canadian Diabetes Association.
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Brosnan, M.E., Letto, J. Interorgan metabolism of valine. Amino Acids 1, 29–35 (1991). https://doi.org/10.1007/BF00808088
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DOI: https://doi.org/10.1007/BF00808088