Lipids

, Volume 35, Issue 9, pp 1011–1015

Dietary docosahexaenoic acid affects stearic acid desaturation in spontaneously hypertensive rats

Authors

    • Laboratory of Cardiovascular Physiology, Department of Physiological NursingUniversity of California
  • Sandrine H. Bellenger-Germain
    • Université de Bourgogne, Faculté des Sciences MirandeUPRES Lipides et Nutrition
  • Mary B. Engler
    • Laboratory of Cardiovascular Physiology, Department of Physiological NursingUniversity of California
  • Michel M. Narce
    • Université de Bourgogne, Faculté des Sciences MirandeUPRES Lipides et Nutrition
  • Jean-Pierre G. Poisson
    • Université de Bourgogne, Faculté des Sciences MirandeUPRES Lipides et Nutrition
Article

DOI: 10.1007/s11745-000-0612-0

Cite this article as:
Engler, M.M., Bellenger-Germain, S.H., Engler, M.B. et al. Lipids (2000) 35: 1011. doi:10.1007/s11745-000-0612-0

Abstract

Docosahexaenoic acid (DHA, 22∶6n−3) is an n−3 polyunsaturated fatty acid which attenuates the development of hypertension in spontaneously hypertensive rats (SHR). The effects of DHA on delta-9-desaturase activity in hepatic microsomes and fatty acid composition were examined in young SHR. Two groups of SHR were fed either a DHA-enriched diet or a control diet for 6 wk. Desaturase activity and fatty acid composition were determined in hepatic microsomes following the dietary treatments. Delta-9-desaturase activity was decreased by 53% in DHA-fed SHR and was accompanied by an increase in 16∶0 and a reduction in 16∶1n−7 content in hepatic microsomes. The DHA diet also increased the levels of eicosapentaenoic acid (20∶5n−3) and DHA. The n−6 fatty acid content was also affected in DHA-fed SHR as reflected by a decrease in gamma-linolenic acid (18∶3n−6), arachidonic acid (20∶5n−6), adrenic acid (22∶4n−6), and docosapentaenoic acid (22∶5n−6). A higher proportion of dihomo-gamma-linolenic acid (20∶3n−6) and a lower proportion of 20∶4n−6 is indicative of impaired delta-5-desaturase activity. The alterations in fatty acid composition and metabolism may contribute to the antihypertensive effect of DHA previously reported.

Abbreviations

CO

control diet

DHA

docosahexaenoic acid

EPA

eicosapentaenoic acid

SHR

spontaneously hypertensive rats

WKY

Wistar Kyoto

Copyright information

© AOCS Press 2000