Lipids

, Volume 40, Issue 9, pp 909–918 | Cite as

Effects of the individual isomers cis-9,trans-11 vs. trans-10,cis-12 of conjugated linoleic acid (CLA) on inflammation parameters in moderately overweight subjects with LDL-phenotype B

  • Julian D. Ramakers
  • Jogchum Plat
  • Jean-Louis Sébédio
  • Ronald P. Mensink
Articles

Abstract

Immune-modulating effects of CLA have been reported in animals, but results are inconsistent. In humans, CLA has shown no effects or only minor effects on immune function. The objective of this study was to evaluate the immune-modulating effects of 3 g cis-9,trans-11 (c9,t11) vs. trans-10,cis-12 (t10,c12) CLA isomers in a population with a high risk of coronary heart disease characterized by moderate overweight (body-mass index, 25–32.5 kg/m2) in combination with LDL-phenotype B (≥35% small LDL cholesterol, density≥1.040 g/mL). After a run-in period of 1 wk, 42 men and women were randomly allocated to the c9,t11 CLA group, the t10,c12 CLA group, or the placebo group. Effects of 13 wk of consumption of 3 g of CLA isomers on cytokine production by ex vivo lipopolysaccharide (LPS)-stimulated peripheral blood mononuclear cells (PBMC) and whole blood, and on plasma C-remononuclear protein (CRP) concentrations were evaluated. To generate hypotheses for future studies, protein expression patterns of 42 cytokines, chemokines, and growth factors were evaluated with an antibody array in pooled, nonstimulated, fasting plasma samples. LPS induced interleukin (IL)-6, IL-8, and tumor necrosis factor-α production by PBMC, and whole blood as well as plasma CRP concentrations were not significantly changed by the c9,t11, and the t10,c12 CLA isomers. The cytokine expression profile in nonstimulated plasma suggested that both CLA isomers induced a specific inflammatory signature, in which the c9,t11 CLA group showed more activity in terms of numbers of proteins regulated. We conclude that daily consumption of 3 g of c9,t11 or t10,c12 CLA isomer did not affect LPS-stimulated cytokine production by PBMC or whole blood and plasma CRP levels. Inflammatory signatures in fasting, nonstimulated plasma as determined by an antibody array may indicate enhanced immune function by both CLA isomers.

Abbreviations

ANCOVA

analysis of covariance

BMI

body-mass index

CHD

coronary heart disease

CRP

C-reactive protein

CSF

colony-stimulating factor

c9,t11

cis-9,trans-11

GRO

growth-regulated protein

IL

interleukin

LPS

lipopolysaccharide

MCP-1

monocyte chemotactic protein-1

MCSF

macrophage colony-stimulating factor

PBMC

peripheral blood mononuclear cells

TMB

tetramethylbenzidine

TNF-α

tumor necrosis factor-α

c12

trans-10,cis-12

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Copyright information

© AOCS Press 2005

Authors and Affiliations

  • Julian D. Ramakers
    • 2
  • Jogchum Plat
    • 2
  • Jean-Louis Sébédio
    • 1
  • Ronald P. Mensink
    • 2
  1. 1.Unité de Nutrition LipidiqueInstitut National de la Recherche Agronomique (INRA)DijonFrance
  2. 2.Department of Human Biology, Nutrition and Toxicology Research Institute MaastrichtMaastricht UniversityMaastrichtThe Netherlands
  3. 3.Unité du Métabolisme Protéino-EnergétiqueINRAClermont FerrandFrance

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