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Journal of Lipid Research, Vol. 42, 2015-2020, December 2001
Copyright © 2001 by Lipid Research, Inc.

Eicosapentaenoic acid and docosahexaenoic acid modulate MAP kinase (ERK1/ERK2) signaling in human T cells

Anne Denysa, Aziz Hichamia, and Naim Akhtar Khana
a UPRES Lipids and Nutrition, Department of Physiology, Faculty of Life Sciences, University of Burgundy, 6 Boulevard Gabriel, Dijon 21000, France

Correspondence to: Naim Akhtar Khan, To whom correspondence should be addressed., Naim.Khan{at}u-bourgogne.fr (E-mail)

This study was conducted on human Jurkat T cell lines to elucidate the role of EPA and DHA, n-3 PUFA, in the modulation of two mitogen-activated protein (MAP) kinases, that is, extracellular signal-regulated kinases 1 and 2 (ERK1 and ERK2). The n-3 PUFA alone failed to induce phosphorylation of ERK1/ERK2. We stimulated the MAP kinase pathway with anti-CD3 antibodies and phorbol 12-myristate 13-acetate (PMA), which act upstream of the MAP kinase (MAPK)/ERK kinase (MEK) as U0126, an MEK inhibitor, abolished the actions of these two agents on MAP kinase activation. EPA and DHA diminished the PMA- and anti-CD3-induced phosphorylation of ERK1/ERK2 in Jurkat T cells. In the present study, PMA acts mainly via protein kinase C (PKC) whereas anti-CD3 antibodies act via PKC-dependent and -independent mechanisms. Furthermore, DHA and EPA inhibited PMA-stimulated PKC enzyme activity. EPA and DHA also significantly curtailed PMA- and ionomycin-stimulated T cell blastogenesis.

Together these results suggest that EPA and DHA modulate ERK1/ERK2 activation upstream of MEK via PKC-dependent and -independent pathways and that these actions may be implicated in n-3 PUFA-induced immunosuppression. — Denys, A., A. Hichami, and N. A. Khan. Eicosapentaenoic acid and docosahexaenoic acid modulate MAP kinase (ERK1/ERK2) signaling in human T cells. J. Lipid Res. 2001. 42: 2015–2020.

Supplementary key words: T cell receptor, protein kinase C, fatty acids


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