Changes in regulation of human monocyte proteins in response to IgG from patients with antiphospholipid syndrome

Vera M. Ripoll, Anastasia Lambrianides, Silvia S. Pierangeli, Katie Poulton, Yiannis Ioannou, Wendy E. Heywood, Kevin Mills, David S. Latchman, David A. Isenberg, Anisur Rahman, Ian P. Giles

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The effects of immunoglobulin G (IgG) from patients with the antiphospholipid syndrome (APS) upon monocyte activation have not been fully characterized. We carried out a comprehensive proteomic analysis of human monocytes treated with IgG from patients with different manifestations of the APS. Using 2-dimensional differential gel electrophoresis (2D DiGE), 4 of the most significantly regulated proteins (vimentin [VIM], zinc finger CCH domain-containing protein 18, CAP Gly domain-containing linker protein 2, and myeloperoxidase) were differentially regulated in monocytes treated with thrombotic or obstetric APS IgG, compared with healthy control (HC) IgG. These findings were confirmed by comparing monocytes isolated from APS patients and HC. Anti-VIM antibodies (AVAs) were significantly increased in 11 of 27 patients (40.7%)with APS. VIMexpression on HC monocytes was stimulated more strongly by APS IgG from patients with higher-avidity serum AVA. We further characterized the proteome of thrombotic APS IgG-treated monocytes using a label-free proteomics technique. Of 12 proteins identified with the most confidence, 2 overlapped with 2D DiGE and many possessed immune response, cytoskeletal, coagulation, and signal transduction functions which are all relevant to APS and may therefore provide potential new therapeutic targets of this disease.

Original languageEnglish
Pages (from-to)3808-3816
Number of pages9
JournalBlood
Volume124
Issue number25
DOIs
StatePublished - 11 Dec 2014
Externally publishedYes

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