Thrombosis in vasculitis: from pathogenesis to treatment.

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Abstract

In recent years, the relationship between inflammation and thrombosis has been deeply investigated and it is now clear that immune and coagulation systems are functionally interconnected. Inflammation-induced thrombosis is by now considered a feature not only of autoimmune rheumatic diseases, but also of systemic vasculitides such as Behçet's syndrome, ANCA-associated vasculitis or giant cells arteritis, especially during active disease. These findings have important consequences in terms of management and treatment. Indeed, Behçet'syndrome requires immunosuppressive agents for vascular involvement rather than anticoagulation or antiplatelet therapy, and it is conceivable that also in ANCA-associated vasculitis or large vessel-vasculitis an aggressive anti-inflammatory treatment during active disease could reduce the risk of thrombotic events in early stages. In this review we discuss thrombosis in vasculitides, especially in Behçet's syndrome, ANCA-associated vasculitis and large-vessel vasculitis, and provide pathogenetic and clinical clues for the different specialists involved in the care of these patients.

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Behçet's disease.

T Sakane, M Takeno, N. Suzuki … (1999)

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Neutrophil extracellular traps mediate transfer of cytoplasmic neutrophil antigens to myeloid dendritic cells toward ANCA induction and associated autoimmunity.

Silvia Piconese, P Colombo, Sabina Sangaletti … (2012)

Antineutrophil cytoplasmic antibodies (ANCAs) target proteins normally retained within neutrophils, indicating that cell death is involved in the autoimmunity process. Still, ANCA pathogenesis remains obscure. ANCAs activate neutrophils inducing their respiratory burst and a peculiar form of cell death, named NETosis, characterized by formation of neutrophil extracellular traps (NETs), decondensed chromatin threads decorated with cytoplasmic proteins endorsed with antimicrobial activity. NETs have been consistently detected in ANCA-associated small-vessel vasculitis, and this association prompted us to test whether the peculiar structure of NET favors neutrophil proteins uploading into myeloid dendritic cells and the induction of ANCAs and associated autoimmunity. Here we show that myeloid DCs uploaded with and activated by NET components induce ANCA and autoimmunity when injected into naive mice. DC uploading and autoimmunity induction are prevented by NET treatment with DNAse, indicating that NET structural integrity is needed to maintain the antigenicity of cytoplasmic proteins. We found NET intermingling with myeloid dendritic cells also positive for neutrophil myeloperoxidase in myeloperoxidase-ANCA-associated microscopic poliangiitis providing a potential correlative picture in human pathology. These data provide the first demonstration that NET structures are highly immunogenic such to trigger adaptive immune response relevant for autoimmunity.

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Etanercept plus standard therapy for Wegener's granulomatosis.

Yuan-I Min (2005)

The majority of patients with Wegener's granulomatosis have disease flares after conventional medications are tapered. There is no consistently safe, effective treatment for the maintenance of remission. We conducted a randomized, placebo-controlled trial at eight centers to evaluate etanercept for the maintenance of remission in 180 patients with Wegener's granulomatosis. The primary outcome was sustained remission, defined as a Birmingham Vasculitis Activity Score for Wegener's Granulomatosis of 0 for at least six months (scores can range from 0 to 67, with higher scores indicating more active disease). In addition to etanercept or placebo, patients received standard therapy (glucocorticoids plus cyclophosphamide or methotrexate). After remission, standard medications were tapered according to the protocol. The mean follow-up for the overall cohort was 27 months. Of the 174 patients who could be evaluated, 126 (72.4 percent) had a sustained remission, but only 86 (49.4 percent) remained in remission for the remainder of the trial. There were no significant differences between the etanercept and control groups in the rates of sustained remission (69.7 percent vs. 75.3 percent, P=0.39), sustained periods of low-level disease activity (86.5 percent vs. 90.6 percent, P=0.32), or the time required to achieve those measures. Disease flares were common in both groups, with 118 flares in the etanercept group (23 severe and 95 limited) and 134 in the control group (25 severe and 109 limited). There was no significant difference between the etanercept and control groups in the relative risk of disease flares per 100 person-years of follow-up (0.89, P=0.54). During the study, 56.2 percent of patients in the etanercept group and 57.1 percent of those in the control group had at least one severe or life-threatening adverse event or died (P=0.90). Solid cancers developed in six patients in the etanercept group, as compared with none in the control group (P=0.01). Etanercept is not effective for the maintenance of remission in patients with Wegener's granulomatosis. Durable remissions were achieved in only a minority of the patients, and there was a high rate of treatment-related complications. Copyright 2005 Massachusetts Medical Society.