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Title

Eicosanoid release is increased by membrane destabilization and CFTR inhibition in Calu-3 cells

Authors
Borot, Florence
Vieu, Diane-Lore
Faure, Grazyna
Fritsch, Janine
Colas, Julien
Moriceau, Sandra
Baudouin-Legros, Maryvonne
Brouillard, Franck
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Published in PLOS One. 2009, vol. 4, no. 10, p. e7116
Abstract The antiinflammatory protein annexin-1 (ANXA1) and the adaptor S100A10 (p11), inhibit cytosolic phospholipase A2 (cPLA2alpha) by direct interaction. Since the latter is responsible for the cleavage of arachidonic acid at membrane phospholipids, all three proteins modulate eicosanoid production. We have previously shown the association of ANXA1 expression with that of CFTR, the multifactorial protein mutated in cystic fibrosis. This could in part account for the abnormal inflammatory status characteristic of this disease. We postulated that CFTR participates in the regulation of eicosanoid release by direct interaction with a complex containing ANXA1, p11 and cPLA2alpha. We first analyzed by plasmon surface resonance the in vitro binding of CFTR to the three proteins. A significant interaction between p11 and the NBD1 domain of CFTR was found. We observed in Calu-3 cells a rapid and partial redistribution of all four proteins in detergent resistant membranes (DRM) induced by TNF-alpha. This was concomitant with increased IL-8 synthesis and cPLA2alpha activation, ultimately resulting in eicosanoid (PGE2 and LTB4) overproduction. DRM destabilizing agent methyl-beta-cyclodextrin induced further cPLA2alpha activation and eicosanoid release, but inhibited IL-8 synthesis. We tested in parallel the effect of short exposure of cells to CFTR inhibitors Inh172 and Gly-101. Both inhibitors induced a rapid increase in eicosanoid production. Longer exposure to Inh172 did not increase further eicosanoid release, but inhibited TNF-alpha-induced relocalization to DRM. These results show that (i) CFTR may form a complex with cPLA2alpha and ANXA1 via interaction with p11, (ii) CFTR inhibition and DRM disruption induce eicosanoid synthesis, and (iii) suggest that the putative cPLA2/ANXA1/p11/CFTR complex may participate in the modulation of the TNF-alpha-induced production of eicosanoids, pointing to the importance of membrane composition and CFTR function in the regulation of inflammation mediator synthesis.
Keywords AnimalsCell Line, TumorCell Membrane/*metabolismCholesterol/chemistryCystic Fibrosis Transmembrane Conductance Regulator/*chemistryEicosanoids/*chemistryGroup IV Phospholipases A2/metabolismHumansInterleukin-8/chemistry/metabolismKineticsMembrane Microdomains/chemistryMicePhospholipids/chemistryProtein BindingSurface Plasmon ResonanceTumor Necrosis Factor-alpha/metabolism
Identifiers
PMID: 19847291
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Research group Mucoviscidose et jonctions GAP (229)
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BOROT, Florence et al. Eicosanoid release is increased by membrane destabilization and CFTR inhibition in Calu-3 cells. In: PLOS ONE, 2009, vol. 4, n° 10, p. e7116. https://archive-ouverte.unige.ch/unige:19504

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Deposited on : 2012-04-23

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