title: Increased tissue arachidonic acid and reduced linoleic acid in a mouse model of cystic fibrosis are reversed by supplemental glycerophospholipids enriched in docosahexaenoic acid.
abstract: An imbalance in (n-6)/(n-3) PUFA has been reported in cystic fibrosis (CF) patients. Glycerophospholipids enriched in docosahexaenoic acid (GPL-DHA) have been shown to regulate the (n-6)/(n-3) fatty acid ratio in the elderly. Here, we tested the effect of GPL-DHA supplementation on PUFA status in F508del homozygous CF mice. GPL-DHA liposomes were administrated by gavage (60 mg DHA/kg daily, i.e. at maximum 1.4 mg DHA/d) to 1.5-mo-old CF mice (CF+DHA) and their corresponding wild-type (WT) homozygous littermates (WT+DHA) for 6 wk. The PUFA status of different tissues was determined by GC and compared with control groups (CF and WT). There was an alteration in the (n-6) PUFA pathway in several CF-target organs in CF compared with WT mice, as evidenced by a higher level of arachidonic acid (AA) in membrane phospholipids or whole tissue (21 and 39% in duodenum-jejunum, 32 and 38% in ileum, and 19 and 43% in pancreas). Elevated AA levels were associated with lower linoleic acid (LA) and higher dihomo-gamma-linolenic acid levels. No DHA deficiency was observed. GPL-DHA treatment resulted in different PUFA composition changes depending on the tissue (increase in LA, decrease in elevated AA, DHA increase, increase in (n-6)/(n-3) fatty acid ratio). However, the DHA/AA ratio consistently increased in all tissues in CF+DHA and WT+DHA mice. Our study demonstrates the effectiveness of an original oral DHA formulation in counter-balancing the abnormal (n-6) fatty acid metabolism in organs of CF mice when administrated at a low dose and highlights the potential of the use of GPL-DHA as nutritherapy for CF patients.
authors.affiliation: INSERM, U 476 Nutrition Humaine et Lipides, Marseille, France.
authors.forename: Myriam
authors.initials: M
authors.lastname: Mimoun
authors.forename: Thierry C
authors.initials: TC
authors.lastname: Coste
authors.forename: Jean
authors.initials: J
authors.lastname: Lebacq
authors.forename: Patrick
authors.initials: P
authors.lastname: Lebecque
authors.forename: Pierre
authors.initials: P
authors.lastname: Wallemacq
authors.forename: Teresinha
authors.initials: T
authors.lastname: Leal
authors.forename: Martine
authors.initials: M
authors.lastname: Armand
mesh_terms: D000818:Animals; D016718:Arachidonic Acid / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D003550:Cystic Fibrosis / Q000235:genetics / Q000378:metabolism*; D019587:Dietary Supplements; D004195:Disease Models, Animal; D004281:Docosahexaenoic Acids / Q000494:pharmacology*; D005227:Fatty Acids / Q000032:analysis; D015525:Fatty Acids, Omega-3 / Q000378:metabolism; D043371:Fatty Acids, Omega-6 / Q000378:metabolism; D020404:Glycerophospholipids / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D007422:Intestines / Q000187:drug effects; D019787:Linoleic Acid / Q000378:metabolism*; D008055:Lipids / Q000737:chemistry / Q000302:isolation & purification; D008168:Lung / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D008815:Mice, Inbred Strains; D010179:Pancreas / Q000187:drug effects / Q000378:metabolism; D010743:Phospholipids / Q000378:metabolism; D017384:Sequence Deletion
chemical_list: D005227:Fatty Acids; D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6; D020404:Glycerophospholipids; D008055:Lipids; D010743:Phospholipids; D004281:Docosahexaenoic Acids; D016718:Arachidonic Acid; D019787:Linoleic Acid