Modulation of blood oxylipin levels by long-chain omega-3 fatty acid supplementation in hyper- and normolipidemic men

verfasst von

Jan Philipp Schuchardt, Simone Schmidt, Gaby Kressel, Ina Willenberg, Bruce D Hammock, Andreas Hahn, Nils Helge Schebb

Abstract

Introduction: Long chain omega-3 polyunsaturated fatty acids (LC n-3 PUFA) such as EPA and DHA have been shown to possess beneficial health effects, and it is believed that many of their effects are mediated by their oxygenated products (oxylipins). Recently, we have shown that serum levels of several hydroxy, epoxy, and dihydroxy FAs are dependent on the individual status of the parent FAs in a cohort of normo- and hyperlipidemic subjects. So far, the effect of an increased dietary LC n-3 PUFA intake on hydroxy, epoxy, and dihydroxy FA levels has not been investigated in subjects with mild combined hyperlipidemia. Subjects and methods: In the present study, we compared oxylipin patterns of 10 hyperlipidemic (cholesterol >200. mg/dl; triglyceride >150. mg/ml) and 10 normolipidemic men in response to twelve weeks of LC n-3 PUFA intake (1.14. g DHA and 1.56. g EPA). Levels of 44 free hydroxy, epoxy and dihydroxy FAs were analyzed in serum by LC-MS. Additionally, oxylipin levels were compared with their parent PUFA levels in erythrocyte membranes; a biomarker for the individual PUFA status. Results: Differences in the oxylipin pattern between normo- and hyperlipidemic subjects were minor before and after treatment. In all subjects, levels of EPA-derived oxylipins (170-4800. pM) were considerably elevated after LC n-3 PUFA intake (150-1400%), the increase of DHA-derived oxylipins (360-3900. pM) was less pronounced (30-130%). The relative change of EPA in erythrocyte membranes is strongly correlated (r≥0.5; p<0.05) with the relative change of corresponding epoxy and dihydroxy FA serum levels. The effect on arachidonic acid (AA)-derived oxylipin levels (140-27,100. pM) was inconsistent. Discussion and conclusions: The dietary LC PUFA composition has a direct influence on the endogenous oxylipin profile, including several highly biological active EPA- and DHA-derived lipid mediators. The shift in oxylipin pattern appears to be dependent on the initial LC PUFA status particularly for EPA. The finding that also levels of other oxylipins derived from ALA, LA or AA are modified by LC n-3 PUFA intake might suggest that at least some of the effects of EPA and DHA could be mediated by a shift in the entire oxylipin profile.

Organisationseinheit(en)

Institut für Lebensmittelwissenschaft und Humanernährung
Abteilung Ernährungsphysiologie und Humanernährung

Externe Organisation(en)

Stiftung Tierärztliche Hochschule Hannover
University of California at Davis

Typ

Artikel

Journal

Prostaglandins Leukotrienes and Essential Fatty Acids

Band

90

Seiten

27-37

Anzahl der Seiten

11

ISSN

0952-3278

Publikationsdatum

15.01.2014

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Klinische Biochemie, Zellbiologie

Elektronische Version(en)

https://doi.org/10.1016/j.plefa.2013.12.008 (Zugang: Unbekannt)