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Fatty Acid Proportions in Plasma Cholesterol Esters and Phospholipids Are Positively Correlated in Various Swedish Populations

Journal article
Authors M. Marklund
R. Pingel
F. Rosqvist
Anna-Karin Lindroos
J. W. Eriksson
B. Vessby
J. Oscarsson
L. Lind
U. Riserus
Published in Journal of Nutrition
Volume 147
Issue 11
Pages 2118-2125
ISSN 0022-3166
Publication year 2017
Published at Institute of Medicine, Department of Internal Medicine and Clinical Nutrition
Pages 2118-2125
Language en
Links doi.org/10.3945/jn.117.254250
Keywords fatty acid, biomarker, cholesterol ester, phospholipid, meta-analysis, adipose-tissue, desaturase activities, gene-cluster, risk-factors, milk-fat, dietary, serum, humans, metabolism, lipids, Nutrition & Dietetics
Subject categories Nutrition and Dietetics

Abstract

Background: Fatty acid (FA) proportions in cholesterol esters (CEs) and plasma phospholipids are widely used as dietary biomarkers. Information on how proportions in these fractions correlate could have implications for interpretation and use of FA biomarkers in observational and interventional studies. Objective: We investigated correlations between FA proportions in CEs and phospholipids in free-living individuals and assessed how diet-induced alterations of FA proportions correlate between fractions. Methods: Spearman's rank correlation coefficients (rs) between FA proportions (percentage of total FAs) in circulating CEs and phospholipids were calculated separately in 8 individual study populations including Swedish females and males (N = 2052; age range: 11-84 y), and pooled by inverse-variance weighted meta-analysis. In addition, study populations were stratified by age, sex, body mass index (BMI; in kg/m(2)), and diabetes status, and strata-specific rs were pooled by meta-analysis. In 2 randomized trials (N = 79) in which dietary saturated FAs were isocalorically replaced with unsaturated FAs, treatment-wise calculations of rs were conducted between FA changes in CEs and phospholipids. Results: Overall, FA proportions in CEs and phospholipids correlated well and especially strongly for polyunsaturated FAs (PUFAs), with pooled rs (95% CIs) ranging from 0.74 (0.72, 0.76) for a-linolenic acid to 0.92 (0.91, 0.93) for eicosapentaenoic acid. Weak correlations (pooled rs <0.4) were observed only for palmitic acid and stearic acid, with pooled rs (95% CIs): 0.29 (0.24, 0.33) and 0.30 (0.25, 0.34), respectively. Overall, correlations were not affected by age, sex, BMI, or diabetes status. Strong correlations (r(s) >= 0.6) between diet-induced FA changes in CEs and phospholipids were observed for most PUFAs. Conclusions: Proportions of most FAs in CEs and phospholipids ranked individuals similarly, suggesting that FA proportions in these fractions can be used interchangeably in populations of diverse age, sex, body composition, and diabetes status. Caution is advised, however, when comparing results from studies assessing palmitic acid or stearic acid in different lipid fractions.

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