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3 results on '"Poland, M.C.R."'

1. Inhibition of COX-2-mediated eicosanoid production plays a major role in the anti-inflammatory effects of the endocannabinoid N-docosahexaenoylethanolamine (DHEA) in macrophages

Author

Meijerink, J., Poland, M.C.R., Balvers, M.G.J., Plastina, P., Lute, C., Dwarkasing, J.T., van Norren, K., and Witkamp, R.F.

Subjects
fish-oil, nitric-oxide synthase, kappa-b, cannabinoid receptor, concise guide, fatty-acids, Nutritional Biology, Voeding, Metabolisme en Genomica, prostaglandin e-2, anandamide, lipids (amino acids, peptides, and proteins), Nutrition, Metabolism and Genomics, arrive guidelines, pharmacology, VLAG
Abstract

Background and Purpose N-docosahexaenoylethanolamine (DHEA) is the ethanolamine conjugate of the long-chain polyunsaturated n-3 fatty acid docosahexaenoic (DHA; 22: 6n-3). Its concentration in animal tissues and human plasma increases when diets rich in fish or krill oil are consumed. DHEA displays anti-inflammatory properties in vitro and was found to be released during an inflammatory response in mice. Here, we further examine possible targets involved in the immune-modulating effects of DHEA. Experimental Approach Antagonists for cannabinoid (CB)1 and CB2 receptors and PPAR¿ were used to explore effects of DHEA on NO release by LPS-stimulated RAW264.7 cells. The possible involvement of CB2 receptors was studied by comparing effects in LPS-stimulated peritoneal macrophages obtained from CB2-/- and CB2+/+ mice. Effects on NF-¿B activation were determined using a reporter cell line. To study DHEA effects on COX-2 and lipoxygenase activity, 21 different eicosanoids produced by LPS-stimulated RAW264.7 cells were quantified by LC-MS/MS. Finally, effects on mRNA expression profiles were analysed using gene arrays followed by Ingenuity® Pathways Analysis. Key Results CB1 and CB2 receptors or PPARs were not involved in the effects of DHEA on NO release. NF-¿B and IFN-ß, key elements of the myeloid differentiation primary response protein D88 (MyD88)-dependent and MyD88-independent pathways were not decreased. By contrast, DHEA significantly reduced levels of several COX-2-derived eicosanoids. Gene expression analysis provided support for an effect on COX–2-mediated pathways. Conclusions and Implications Our findings suggest that the anti-inflammatory effects of DHEA in macrophages predominantly take place via inhibition of eicosanoids produced through COX-2.

Published
2015

3. The ethanolamide metabolite of DHA, docosahexaenoylethanolamine, shows immunomodulating effects in mouse peritoneal and RAW264.7 macrophages: evidence for a new link between fish oil and inflammation

Author

Meijerink, J., Plastina, P., Vincken, J.P., Poland, M.C.R., Attya, M., Balvers, M.G.J., Gruppen, H., Gabriele, B., Witkamp, R.F., Meijerink, J., Plastina, P., Vincken, J.P., Poland, M.C.R., Attya, M., Balvers, M.G.J., Gruppen, H., Gabriele, B., and Witkamp, R.F.

Abstract

Several mechanisms have been proposed for the positive health effects associated with dietary consumption of long-chain n-3 PUFA (n-3 LC-PUFA) including DHA (22 : 6n-3) and EPA (20 : 5n-3). After dietary intake, LC-PUFA are incorporated into membranes and can be converted to their corresponding N-acylethanolamines (NAE). However, little is known on the biological role of these metabolites. In the present study, we tested a series of unsaturated NAE on the lipopolysaccharide (LPS)-induced NO production in RAW264.7 macrophages. Among the compounds tested, docosahexaenoylethanolamine (DHEA), the ethanolamide of DHA, was found to be the most potent inhibitor, inducing a dose-dependent inhibition of NO release. Immune-modulating properties of DHEA were further studied in the same cell line, demonstrating that DHEA significantly suppressed the production of monocyte chemotactic protein-1 (MCP-1), a cytokine playing a pivotal role in chronic inflammation. In LPS-stimulated mouse peritoneal macrophages, DHEA also reduced MCP-1 and NO production. Furthermore, inhibition was also found to take place at a transcriptional level, as gene expression of MCP-1 and inducible NO synthase was inhibited by DHEA. To summarise, in the present study, we showed that DHEA, a DHA-derived NAE metabolite, modulates inflammation by reducing MCP-1 and NO production and expression. These results provide new leads in molecular mechanisms by which DHA can modulate inflammatory processes.

Published
2011

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