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Linoleic acid increases monocyte chemotaxis and adhesion to human aortic endothelial cells through protein kinase C- and cyclooxygenase-2-dependent mechanisms

Authors :
Matesanz, Nuria
Jewhurst, Victoria
Trimble, Elisabeth R.
McGinty, Ann
Owens, Daphne
Tomkin, Gerald H.
Powell, Lesley A.
Source :
Journal of Nutritional Biochemistry. Jun2012, Vol. 23 Issue 6, p685-690. 6p.
Publication Year :
2012

Abstract

Abstract: The effects of polyunsaturated n-6 linoleic acid on monocyte–endothelial interactions were investigated with particular emphasis on the expression of platelet/endothelial cell adhesion molecule (PECAM)-1 and the role of protein kinase C (PKC) and cyclooxygenase-2 (COX-2). As a diet rich in polyunsaturated fatty acids may favour atherosclerosis in hyperglycaemia, this study was performed in both normal and high-glucose media using human aortic endothelial cells (HAEC). The HAEC were preincubated with normal (5 mM) or high (25 mM) d-glucose for 3 days before addition of fatty acids (0.2 mM) for 3 days. Linoleic acid enhanced PECAM-1 expression independently of tumor necrosis factor (TNF)-α and significantly increased TNF-α-induced monocyte adhesion to HAEC in comparison to the monounsaturated n-9 oleic acid. Chronic glucose treatment (25 mM, 6 days) did not modify the TNF-α-induced or fatty acid-induced changes in monocyte binding. The increase in monocyte binding was accompanied by a significant increase in E-selectin and vascular cell adhesion molecule (VCAM)-1 expression and could be abrogated by an interleukin (IL)-8 neutralising antibody and by the PKC and COX inhibitors. Inhibition of PKC-δ reduced VCAM-1 expression regardless of experimental condition and was accompanied by a significant decrease in monocyte binding. Conditioned medium from linoleic acid-treated HAEC grown in normal glucose conditions significantly increased THP-1 chemotaxis. These results suggest that linoleic acid-induced changes in monocyte chemotaxis and subsequent binding are not solely mediated by changes in adhesion molecule expression but may be due to secreted factors such as IL-8, monocyte chemoattractant protein-1 or prostaglandins (PGs) such as PGE2, as IL-8 neutralisation and COX-2 inhibition reduced monocyte binding without changes in adhesion molecule expression. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
09552863
Volume :
23
Issue :
6
Database :
Academic Search Index
Journal :
Journal of Nutritional Biochemistry
Publication Type :
Academic Journal
Accession number :
75168954
Full Text :
https://doi.org/10.1016/j.jnutbio.2011.03.020