title: Selective association of plasma non-esterified fatty acid species with circulating interleukin-8 concentrations in humans.
abstract: Elevated plasma concentrations of non-esterified fatty acids (NEFA), due to high fat intake and/or adipose tissue lipolysis, are a hallmark of the metabolic syndrome. We assessed whether certain plasma NEFA species contribute to the chronic low-grade inflammatory state seen in the metabolic syndrome. We determined the fasting plasma NEFA patterns of 75 overweight non-diabetic subjects and analysed their relationship with plasma inflammatory parameters. After adjustment for gender, age, body fat, and waist-hip ratio, no strong correlations of single NEFA species with leukocyte number, C-reactive protein, interleukin-6, tumour necrosis factor-alpha, or monocyte chemoattractant protein-1 were detected. However, oleate was negatively (r=-0.36, p=0.0015) and myristate (r=0.41, p=0.0003) as well as the omega3-polyunsaturated NEFA alpha-linolenate (r=0.37, p=0.0011), eicosapentaenoate (r=0.40, p=0.0003), and docosahexaenoate (r=0.40, p=0.0004) were positively associated with interleukin-8 concentrations. The other NEFA species as well as the total plasma NEFA concentration did not correlate with interleukin-8. The correlations of myristate, oleate, and the sum of all omega3-polyunsaturated NEFA with interleukin-8 were independent of plasma tumour necrosis factor-alpha and overall adiposity. Our data demonstrate close and selective associations of oleate, myristate, and omega3-polyunsaturated NEFA with plasma concentrations of the pro-inflammatory chemokine interleukin-8. Thus, these NEFA species may represent specific determinants of plasma interleukin-8.
authors.affiliation: Department of Internal Medicine, Division of Endocrinology, Diabetology, Angiology, Nephrology, and Clinical Chemistry, Eberhard-Karls-University Tübingen, Tübingen, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Staiger
authors.forename: J
authors.initials: J
authors.lastname: Wöll
authors.forename: C
authors.initials: C
authors.lastname: Haas
authors.forename: F
authors.initials: F
authors.lastname: Machicao
authors.forename: E D
authors.initials: ED
authors.lastname: Schleicher
authors.forename: A
authors.initials: A
authors.lastname: Fritsche
authors.forename: N
authors.initials: N
authors.lastname: Stefan
authors.forename: H-U
authors.initials: HU
authors.lastname: Häring
mesh_terms: D000328:Adult; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000378:metabolism; D005230:Fatty Acids, Nonesterified / Q000097:blood*; D005260:Female; D006801:Humans; D016209:Interleukin-8 / Q000097:blood*; D008297:Male; D008875:Middle Aged; D050177:Overweight / Q000097:blood; D054390:Receptors, CCR2 / Q000097:blood; D014409:Tumor Necrosis Factor-alpha / Q000097:blood; D049629:Waist-Hip Ratio
chemical_list: D005230:Fatty Acids, Nonesterified; D016209:Interleukin-8; D054390:Receptors, CCR2; D014409:Tumor Necrosis Factor-alpha; D002097:C-Reactive Protein