Comparative studies on lipid metabolism in salt-transporting organs of the rainbow trout (Oncorhynchus mykiss W.). Further evidence of monounsaturated phosphatidylethanolamine as a key substance

H.J.M. Hansen, A.G. Olsen, P. Rosenkilde

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    1. A drop in ambient temperature from 18 to 6°C results in a drop by a factor of 4 in the incorporation in vivo of (32P) phosphate and (1-14C) acetate into lipids in trout intestine, kidney and liver, independent of environmental salinity, when the two precursors are added to the water in the incubation tank.

    2. In sea-water a similar mean temperature factor of 5 applies to the incorporation into gill tissue lipids in trout as well as in eels (Anguilla anguilla).

    3. However, in fresh water a factor of 5 applies only to the incorporation into eel and trout gill lipids of (1-14C) acetate but not of (32P) phosphate; the latter precursor is subject to a drop in incorporation by as much a factor as 60 as the ambient temperature goes down from 19 to 6°C.

    4. The relative incorporation (% of total phospholipid) into phosphatidylethanolamine of (32P) phosphate and (1-14C) acetate shows a positive linear correlation with the ratio
    of the corresponding total incorporations into eel and trout gill lipids.

    5. The 14C-labelled trout fatty acids tend to be less unsaturated at 6 than at 18°C in all tissues, apart from gill tissue in sea-water, where they seem unchanged.
    Original languageEnglish
    JournalComparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
    Volume103
    Issue number1
    Pages (from-to)81-87
    ISSN1096-4959
    DOIs
    Publication statusPublished - 1992

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