title: Influence of very low dietary intake of marine oil on some functional aspects of immune cells in healthy elderly people.
abstract: Ageing is a multifactorial process involving decreased antioxidant defences and immune functions. n-3 Polyunsaturated fatty acids have been associated with human health benefits, especially against inflammatory and autoimmune diseases. However, their immunomodulatory effects were usually observed with high dosages (>2 g/d) known to increase lipid peroxidation. In contrast, very low doses, that may prevent lipid peroxidation, might affect the immune system differently. To study the latter hypothesis further, we investigated whether the supplementation of healthy elderly people with very low doses of marine oil (MO), a docosahexaenoate (DHA)- and eicosapentaenoate (EPA)-rich triacylglycerol, was able to affect lymphocyte proliferation and biochemical markers known to be altered with age. In a randomized, double-blind design, twenty healthy elderly subjects were assigned to a placebo group (600 mg sunflower oil/d) or to a group consuming 600 mg MO/d providing 150 mg DHA + 30 mg (EPA) for 6 weeks. At day 42, the proliferative responses of lymphocytes to several mitogens were significantly (P<0.01) decreased in the MO group compared with control values. This was accompanied by a slight lowering of their cytosolic cyclic nucleotide phosphodiesterase (PDE) activity, a marked and significant (P<0.05) increase of their particulate PDE activity (+56-57 %) and a slight but significant (P<0.05) increase in cyclic nucleotide intracellular levels. At the same time, the glutathione peroxidase activity was markedly and significantly (P<0.01) depressed in the MO group. None of these modifications could be seen in the placebo group. Collectively, these results demonstrate that even very low doses of n-3 fatty acids are sufficient to affect the immune responses of elderly subjects.
authors.affiliation: Institut National de la Santé et de la Recherche Médicale U352, Laboratoire de Biochimie et Pharmacologie, INSA-Lyon, France.
authors.forename: Shaliha
authors.initials: S
authors.lastname: Bechoua
authors.forename: Madeleine
authors.initials: M
authors.lastname: Dubois
authors.forename: Evelyne
authors.initials: E
authors.lastname: Véricel
authors.forename: Paul
authors.initials: P
authors.lastname: Chapuy
authors.forename: Michel
authors.initials: M
authors.lastname: Lagarde
authors.forename: Annie-France
authors.initials: AF
authors.lastname: Prigent
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000378:metabolism; D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000378:metabolism; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000276:immunology*; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage*; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D015525:Fatty Acids, Omega-3 / Q000008:administration & dosage*; D005260:Female; D005979:Glutathione Peroxidase / Q000378:metabolism; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000201:enzymology / Q000276:immunology*; D008213:Lymphocyte Activation / Q000187:drug effects; D008297:Male; D013997:Time Factors
chemical_list: D004042:Dietary Fats, Unsaturated; D015525:Fatty Acids, Omega-3; D005979:Glutathione Peroxidase; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D015106:3',5'-Cyclic-GMP Phosphodiesterases