Published online before print September 22, 2006
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of human neutrophil NADPH-oxidase activity induced by anti-proteinase-3 or anti-myeloperoxidase antibodies
* Département d’Hématologie-Immunologie-Cytogénétique, Centre Hospitalier de Valenciennes, and Laboratoire d’Hématologie, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille-2, Lille, France; and
Sanquin Research at Central Laboratory for Blood Transfusion (CLB) and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
1 Correspondence: Laboratoire d’Hématologie, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille-2, 3 rue du Professeur Laguesse, 59006 Lille cedex, France. E-mail: dominique.reumaux{at}libertysurf.fr
Anti-proteinase-3 (anti-PR3) or anti-myeloperoxidase (anti-MPO) antibodies are capable of activating human neutrophils primed by TNF-
in vitro. We described previously the involvement of Fc
RIIa and β2 integrins in this neutrophil activation. In the literature, the requirement of TNF priming has been attributed to an effect of TNF- on the expression of PR3 or MPO on the cell surface. Under our experimental conditions, TNF- (2 ng/ml) increased the binding of the antibody against PR3, whereas binding of the antibody against MPO could hardly be detected, not even after TNF- treatment. The aim of this study was to consider (an)other(s) role(s) for TNF- in facilitating the NADPH-oxidase activation by these antibodies. We demonstrate the early mobilization of the secretory vesicles as a result of TNF-induced increase in intracellular-free calcium ions, the parallel colocalization of gp91phox, the main component of the NADPH oxidase with β2 integrins and FcRIIa on the neutrophil surface, and the FcRIIa clustering upon TNF priming. TNF- also induced redistribution of FcRIIa to the cytoskeleton in a dose- and time-dependent manner. Moreover, blocking CD18 MHM23 antibody, cytochalasin B, and D609 (an inhibitor of phosphatidylcholine phospholipase C) inhibited this redistribution and the respiratory burst in TNF-treated neutrophils exposed to anti-PR3 or anti-MPO antibodies. Our results indicate direct effects of TNF- in facilitating neutrophil activation by these antibodies and further support the importance of cytoskeletal rearrangements in this priming process.
Key Words: TNF- • neutrophil activation • ANCA • vasculitis
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