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Tissue phospholipid fatty acid composition in genetically lean (Fa/−) or obese (fa/fa) zucker female rats on the same diet

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Lipids

An Erratum to this article was published on 01 December 1994

Abstract

The fatty acid composition of serum total lipids, of phospholipids of various organs (liver, heart, kidney), and of nervous structures (brain, retina, sciatic nerve, myelin, synaptosomes) have been compared in lean (Fa/−) and genetically obese (fa/fa) Zucker female rats. Both received a standard commercial diet including 37% of 18∶2n−6 and 5% of n−3 polyunsaturated fatty acids (PUFA), 1.7% of which were in the form of 20∶5n−3 and 22∶6n−3. In comparison with lean rats, the results for the obese rats pointed out (i) no difference in the fatty acid composition of nervous structures: (ii) a decrease of 18∶2n−6 (from −8% to −35%) and of 20∶4n−6 (from −9% to −49%) in serum, liver and in kidney; this was compensated for by an increase in 20∶3n−6 (from +30% to +320%) and in total n−3 PUFA (from +68% to +76%); (iii) a decrease of 20∶4n−6 (−18%) and of 22∶6n−3 (−24%) in heart compensated for by an increase in 18∶2n−6 (+39%) and in 20∶3n−6 (+233%); and (iv) constant levels of total PUFA (n−6 and n−3) in the various fractions studied, except in serum where this level decreased (−23%). Finally, except for the nervous structures, tissue phospholipids of obese rats included a lower proportion of 20∶4n−6 and a higher proportion of 20∶3n−6. This resulted in a significant reduction in the 20∶4n−6/20∶3n−6 ratio; by contrast, the 20∶3n−6/18∶2n−6 ratio increased. The results suggest that in Zucker rats, the obese character (fa/fa) affects the desaturation-elongation process of 18∶2n−6 to 20∶4n−6 by specifically decreasing Δ5-desaturase activity.

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Abbreviations

BHT:

butylhydroxytoluene

GLC:

gas-liquid chromatography

FFAP:

free fatty acid phase

MUFA:

monounsaturated fatty acids

PL:

phospholipids

PUFA:

polyunsaturated fatty acids

SFA:

saturated fatty acids

TSL:

total serum lipids

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Authors and Affiliations

  1. Station de Recherches de Nutrition, 78350, Jouy-en-Josas, France

    Ph. Guesnet & G. Durand

  2. Laboratorie des Sciences de la Consommation INRA-CRJ, 78350, Jouy-en-Josas, France

    G. Pascal

  3. INSERM U26, Hopital Femand-Widal, 200 rue du Faubourg St. Denis, 75475, Paris, France

    J. -M. Bourre

  4. INSERM U177, Institut des Cordeliers, 15 rue de l'Ecole de Medecine, 75270, Paris, France

    M. Guerre-Millo

Authors
  1. Ph. Guesnet
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  2. J. -M. Bourre
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  3. M. Guerre-Millo
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  4. G. Pascal
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  5. G. Durand
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Guesnet, P., Bourre, J.M., Guerre-Millo, M. et al. Tissue phospholipid fatty acid composition in genetically lean (Fa/−) or obese (fa/fa) zucker female rats on the same diet. Lipids 25, 517–522 (1990). https://doi.org/10.1007/BF02537157

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  • DOI: https://doi.org/10.1007/BF02537157

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