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Activation of sPLA2-IIA and PGE2 production by high mobility group protein B1 in vascular smooth muscle cells sensitized by IL-1ß

Amandine Jaulmes^*, Sylvain Thierry, Brigitte Janvier^*, Michel Raymondjean^* and Vincent Maréchal^,1

UMR Physiologie et Physiopathologie, Université Pierre et Marie Curie, CNRS,
^* Bâtiment A, Paris, France; and

Centre de recherches biomédicales des Cordeliers, Paris, France

¹Correspondence: Centre de recherches biomédicales des Cordeliers, 15 rue de l’Ecole de Médecine, Paris 75270, CEDEX 06, France. E-mail: vincent.marechal{at}snv.jussieu.fr

ABSTRACT

Lipid mediators such as prostaglandin E2 (PGE2) play a central role during atherogenesis as a consequence of inflammation. PGE2 is produced from phospholipids by a cascade of enzymatic reactions involving phospholipase A2 (PLA2), cyclooxygenase (COX), and prostaglandin E synthase (PGES). It is released by several cell types, including vascular smooth muscle cells (VSMCs). Recent work has shown that the secretory PLA2-IIA (sPLA2-IIA), the most abundant isoform of secreted PLA2 in VSMCs, acts as a potent cytokine and activates VSMCs through a positive feedback loop. High mobility group protein 1 (HMGB1), also known as amphoterin, is a ubiquitous protein that plays various roles in the nucleus. HMGB1 is released by necrotic cells and by immune cells in response to various inflammatory mediators and acts as a potent proinflammatory cytokine. The present study investigates the role of HMGB1 in the activation of sPLA2-IIA expression and PGE2 production in VSMCs. Recombinant HMGB1 slightly activated the sPLA2-IIA, COX-2, and mPGES-1 genes but dramatically stimulated these genes in VSMCs that had been incubated with the proinflammatory cytokine IL-1ß for 24 h. This effect was accompanied by significantly increased PGE2 release. Induction of the three known receptors of HMGB1, namely RAGE, TLR-2, and TLR-4, by IL-1ß suggests that proinflammatory cytokines sensitize VSMCs to HMGB1. This provides new insights into the role of HMGB1 in VSMCs, suggesting it may be essential for the progression of atherosclerosis.—Jaulmes, A., Thierry, S., Janvier, B., Raymondjean, M., Maréchal, V. Activation of sPLA2-IIA and PGE2 production by high mobility group protein B1 in vascular smooth muscle cells sensitized by interleukin (IL)-1ß.

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