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Acyl composition of muscle membranes varies with body size in birds.

Abstract

The acyl composition of phospholipids from pectoral muscle of eight species of birds, ranging in size from the 13 g zebra finch to the 34 kg emu, were measured and combined with recent published results for a 3 g hummingbird. This represents an approximately 11000-fold range in body mass. Muscle phospholipids, and thus muscle membrane bilayers, from birds had a relatively constant unsaturated acyl chain content of 62% but exhibited a significant allometric decline in unsaturation index (number of double bonds per 100 acyl chains) with increasing body mass. There was a significant allometric increase in the percentage of mono-unsaturates and a significant allometric decline in the percentage of n-3 polyunsaturates with increasing body mass, whilst there were no significant allometric trends in either percentage of n-6 or percentage of total polyunsaturates in bird muscle. The relative content of the highly polyunsaturated docosahexaenoic acid (22:6 n-3) showed the greatest scaling with body mass, having an allometric exponent of -0.28. The contribution of this n-3 polyunsaturate to the unsaturation index varied with body size, ranging from less than a 6% contribution in the emu to approximately 70% in the hummingbird. Such allometric variation in the acyl composition of bird muscle phospholipids is similar to that observed in mammals, although birds have fewer n-3 polyunsaturates and more n-6 polyunsaturates than do mammalian phospholipids. This allometric variation in phospholipid acyl composition is discussed with respect to both the metabolic intensity and lifespan of different sized bird species.

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  • Authors+Show Affiliations

    ,

    Metabolic Research Centre, University of Wollongong, Wollongong, NSW 2522, Australia. hulbert@uow.edu.au

    , ,

    Source

    The Journal of experimental biology 205:Pt 22 2002 Nov pg 3561-9

    MeSH

    Animals
    Basal Metabolism
    Birds
    Body Constitution
    Cell Membrane
    Docosahexaenoic Acids
    Fatty Acids
    Fatty Acids, Monounsaturated
    Fatty Acids, Omega-3
    Fatty Acids, Omega-6
    Fatty Acids, Unsaturated
    Linoleic Acid
    Muscle, Skeletal
    Phospholipids
    Songbirds

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    12364409

    Citation

    Hulbert, A J., et al. "Acyl Composition of Muscle Membranes Varies With Body Size in Birds." The Journal of Experimental Biology, vol. 205, no. Pt 22, 2002, pp. 3561-9.
    Hulbert AJ, Faulks S, Buttemer WA, et al. Acyl composition of muscle membranes varies with body size in birds. J Exp Biol. 2002;205(Pt 22):3561-9.
    Hulbert, A. J., Faulks, S., Buttemer, W. A., & Else, P. L. (2002). Acyl composition of muscle membranes varies with body size in birds. The Journal of Experimental Biology, 205(Pt 22), pp. 3561-9.
    Hulbert AJ, et al. Acyl Composition of Muscle Membranes Varies With Body Size in Birds. J Exp Biol. 2002;205(Pt 22):3561-9. PubMed PMID: 12364409.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Acyl composition of muscle membranes varies with body size in birds. AU - Hulbert,A J, AU - Faulks,S, AU - Buttemer,W A, AU - Else,P L, PY - 2002/10/5/pubmed PY - 2003/5/17/medline PY - 2002/10/5/entrez SP - 3561 EP - 9 JF - The Journal of experimental biology JO - J. Exp. Biol. VL - 205 IS - Pt 22 N2 - The acyl composition of phospholipids from pectoral muscle of eight species of birds, ranging in size from the 13 g zebra finch to the 34 kg emu, were measured and combined with recent published results for a 3 g hummingbird. This represents an approximately 11000-fold range in body mass. Muscle phospholipids, and thus muscle membrane bilayers, from birds had a relatively constant unsaturated acyl chain content of 62% but exhibited a significant allometric decline in unsaturation index (number of double bonds per 100 acyl chains) with increasing body mass. There was a significant allometric increase in the percentage of mono-unsaturates and a significant allometric decline in the percentage of n-3 polyunsaturates with increasing body mass, whilst there were no significant allometric trends in either percentage of n-6 or percentage of total polyunsaturates in bird muscle. The relative content of the highly polyunsaturated docosahexaenoic acid (22:6 n-3) showed the greatest scaling with body mass, having an allometric exponent of -0.28. The contribution of this n-3 polyunsaturate to the unsaturation index varied with body size, ranging from less than a 6% contribution in the emu to approximately 70% in the hummingbird. Such allometric variation in the acyl composition of bird muscle phospholipids is similar to that observed in mammals, although birds have fewer n-3 polyunsaturates and more n-6 polyunsaturates than do mammalian phospholipids. This allometric variation in phospholipid acyl composition is discussed with respect to both the metabolic intensity and lifespan of different sized bird species. SN - 0022-0949 UR - https://www.unboundmedicine.com/medline/citation/12364409/Acyl_composition_of_muscle_membranes_varies_with_body_size_in_birds_ L2 - http://jeb.biologists.org/cgi/pmidlookup?view=long&pmid=12364409 DB - PRIME DP - Unbound Medicine ER -