Blood Cell-Bound C4d as a Marker of Complement Activation in Patients With the Antiphospholipid Syndrome

Blood Cell-Bound C4d as a Marker of Complement Activation in Patients With the Antiphospholipid Syndrome Paola Adele Lonati1†, Mariangela Scavone2,3†, Maria Gerosa4, Maria Orietta Borghi1,4, Francesca Pregnolato1, Daniele Curreli1, Gianmarco Podda2,3, Eti Alessandra Femia2,3, Wilma Barcellini5, Marco Cattaneo2,3, Francesco Tedesco1 and Pier Luigi Meroni1* 1Immunorheumatology Research Laboratory, Istituto Auxologico Italiano, IRCCS, Milan, Italy2Unità di Medicina II, ASST Santi Paolo e Carlo, Milan, Italy3Dipartimento di Scienze Della Salute, University of Milan, Milan, Italy4Dipartimento di Scienze Cliniche e di Comunità, University of Milan, Milan, Italy5UOC Ematologia, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy Antiphospholipid syndrome (APS) is a chronic and disabling condition characterized by recurrent thrombosis and miscarriages mediated by antibodies against phospholipid-binding proteins (aPL), such as beta2glycoprotein I (β2GPI). Complement is involved in APS animal models and complement deposits have been documented in placenta and thrombotic vessels despite normal serum levels. Analysis of circulating blood cells coated with C4d displays higher sensitivity than the conventional assays that measure soluble native complement components and their unstable activation products in systemic lupus erythematosus (SLE). As C4d-coated blood cell count has been reported to be more sensitive than serum ...
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research

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