Long-chain n-3 fatty acid supplementation in men increases resistance to activated protein C

Englyst, Nicola A., Grimble, Robert F. and Byrne, Christopher D. (2007) Long-chain n-3 fatty acid supplementation in men increases resistance to activated protein C. Metabolism, 56, (4), 547-551. (doi:10.1016/j.metabol.2006.11.017).


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It has recently and controversially been demonstrated that fish oil supplementation may not be beneficial for everyone, but to date there have been no biological explanations. We suggest that resistance to the anticoagulant, activated protein C (APC), be considered as a potential mechanism, because it has been demonstrated that the type of fatty acids on phospholipids modulates function of the APC pathway. The APC ratio in plasma was decreased by 7% after fish oil supplementation in healthy men (P<.005; n=35). The decrease in APC ratio equates to an increase in APC resistance. Fish oil lowered the APC ratio by (1) increasing low-density lipoprotein (LDL) cholesterol (P<.01) and apolipoprotein B (P<.05) and (2) increasing platelet microparticles (P<.05). In vitro, purified LDL decreased the APC ratio and increased microparticle formation. These changes affecting the anticoagulant APC could contribute toward a prothrombotic state, potentially explaining the recent observation that fish oil supplementation may not always be of benefit. These findings will need to be repeated in different disease states.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.metabol.2006.11.017
ISSNs: 0026-0495 (print)
Related URLs:
Subjects: R Medicine > RC Internal medicine
Divisions : University Structure - Pre August 2011 > School of Medicine
ePrint ID: 61093
Accepted Date and Publication Date:
April 2007Published
Date Deposited: 24 Sep 2008
Last Modified: 31 Mar 2016 12:44
URI: http://eprints.soton.ac.uk/id/eprint/61093

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