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The regulation of glycerol 3-phosphate oxidase of rat brownadipose tissue mitochondria by long-chain free fatty acids

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Summary

Added free fatty acids inhibit oxidation of glycerol 3-phosphate, succinate and NADH in brownadipose tissue mitochondria from 10-day-old rats. The most pronounced is the inhibitory effect on glycerol 3-phosphate cytochromec reductase (GP-cyto.c reductase). Contrary to other reductases, GP-cyto.c reductase activity of freshly isolated mitochondria is already inhibited by the fraction of endogenous free fatty acids.

Both added and endogenous free fatty acids inhibition of GP-cyto.c reductase is fully reversible by the removal of free fatty acids by bovine serum albumine treatment.

The inhibition of GP-cyto.c reductase is of strictly non-competitive type. The most inhibitory are unsaturated long-chain free fatty acids — oleic and linoleic acid.

Results are discussed with regards to the regulatory importance of free fatty acids in brown-adipose tissue during intensive non-shivering thermogenesis.

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Authors and Affiliations

  1. Institute of Physiology, Czechoslovak Academy of Sciences, Prague, Czechoslovakia

    J. Houštěk & Z. Drahota

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  1. J. Houštěk
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  2. Z. Drahota
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Houštěk, J., Drahota, Z. The regulation of glycerol 3-phosphate oxidase of rat brownadipose tissue mitochondria by long-chain free fatty acids. Mol Cell Biochem 7, 45–50 (1975). https://doi.org/10.1007/BF01732162

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  • DOI: https://doi.org/10.1007/BF01732162

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