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Preferential oxidation of linolenic acid compared to linoleic acid in the liver of catfish (Heteropneustes fossilis andClarias batrachus)

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Lipids

Abstract

The fate of [1-14C] linoleic acid and [1-14C] linolenic acid in the liver slices and also in the liver tissues of live carnivorous catfish,Heteropneustes fossilis andClarias batrachus, was studied. Incorporation of the fatty acids into different lipid classes in the live fish differed greatly from the tissue slices, indicating certain physiological control operative in vivo. The extent of desaturation and chain elongation of linoleic and linolenic acids into long-chain polyunsaturated fatty acids was low. Linolenic acid was oxidized (thus labeling the saturated fatty acid with liberated14C-acetyl-CoA) in preference to linoleic acid, and this oxidation also seemed to be under physiological control since both of the fatty acids were poorly oxidized in the tissue slices and in the killed fish. These fish can therefore recognize the difference in the acyl chain structures of linoleate and linolenate. The higher oxidation of liolenic acid and poor capacity for its conversion to longer chain, highly unsaturated derivatives indicates a higher demand for the dietary supply of these essential fatty acids in these two species.

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Abbreviations

PUFA:

polyunsaturated fatty acid

EFA:

essential fatty acid

ECL:

equivalent chain length

TG:

trigly cerides

FFA:

free fatty acid

PL:

polar lipids

WE:

wax ester

TLC:

thin layer chromatography

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Authors and Affiliations

  1. Department of Chemistry, Bose Institute, 700 009, Calcutta, India

    Gautam K. Bandyopadhyay & Jyotirmoy Dutta

  2. Departments of Biochemistry, Bose Institute, 700 009, Calcutta, India

    Sudhamoy Ghosh

Authors
  1. Gautam K. Bandyopadhyay
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  2. Jyotirmoy Dutta
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  3. Sudhamoy Ghosh
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Bandyopadhyay, G.K., Dutta, J. & Ghosh, S. Preferential oxidation of linolenic acid compared to linoleic acid in the liver of catfish (Heteropneustes fossilis andClarias batrachus). Lipids 17, 733–740 (1982). https://doi.org/10.1007/BF02534660

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  • DOI: https://doi.org/10.1007/BF02534660

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