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Knight JS, Erkan D. Rethinking antiphospholipid syndrome to guide future management and research. Nat Rev Rheumatol 2024; 20:377-388. [PMID: 38702511 DOI: 10.1038/s41584-024-01110-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/18/2024] [Indexed: 05/06/2024]
Abstract
Antiphospholipid syndrome (APS) consists of thrombotic, non-thrombotic and obstetric clinical manifestations developing in individuals with persistent antiphospholipid antibodies (aPL). Although researchers have made progress in characterizing different clinical phenotypes of aPL-positive people, the current approach to clinical management is still mostly based on a 'one size fits all' strategy, which is derived from the results of a limited number of prospective, controlled studies. With the 2023 publication of the ACR-EULAR APS classification criteria, it is now possible to rethink APS, to lay the groundwork for subphenotyping through novel pathophysiology-informed approaches, and to set a future APS research agenda guided by unmet needs in clinical management.
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Affiliation(s)
- Jason S Knight
- Division of Rheumatology, University of Michigan, Ann Arbor, MI, USA
| | - Doruk Erkan
- Barbara Volcker Center for Women and Rheumatic Diseases, Hospital for Special Surgery, Weill Cornell Medicine, New York, NY, USA.
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2
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Tektonidou MG, Vlachogiannis NI, Sfikakis PP. T cell involvement in antiphospholipid syndrome. Clin Immunol 2024; 263:110218. [PMID: 38640985 DOI: 10.1016/j.clim.2024.110218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 03/15/2024] [Accepted: 04/08/2024] [Indexed: 04/21/2024]
Abstract
Antiphospholipid syndrome (APS) is a systemic autoimmune disorder characterized by arterial and venous thrombosis, and obstetric complications in the presence of antiphospholipid antibodies (aPL), including lupus anticoagulant, anticardiolipin and anti-β2-glycoprotein I antibodies. APS manifests as single, often as recurrent events, and rarely as a catastrophic condition. Most studies of APS pathogenesis to date have focused on the prothrombotic role of aPL, while innate immune responses such as monocyte, complement and neutrophil activation have been also recognized as part of the thrombo-inflammatory cascade in APS. While the presence of autoreactive T cells against β2-glycoprotein I has been long known, less data are available on their pathogenetic role in APS. In this review, we summarize current knowledge on the involvement of T cells in APS pathophysiology, alterations of T cell subsets in peripheral blood, and clinical associations. We also highlight potential therapeutic opportunities by targeting T helper-B cell interactions in these patients.
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Affiliation(s)
- Maria G Tektonidou
- First Department of Propaedeutic Internal Medicine and Joint Academic Rheumatology Program, National and Kapodistrian University of Athens, Medical School, Athens, Greece.
| | - Nikolaos I Vlachogiannis
- First Department of Propaedeutic Internal Medicine and Joint Academic Rheumatology Program, National and Kapodistrian University of Athens, Medical School, Athens, Greece
| | - Petros P Sfikakis
- First Department of Propaedeutic Internal Medicine and Joint Academic Rheumatology Program, National and Kapodistrian University of Athens, Medical School, Athens, Greece
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3
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Bouvier S, Fortier M, Nouvellon E, Olivan A, Chéa M, Gris JC. NEUT-RI, a surrogate marker of NETosis is lower in patients with strong IgM antiphospholipid antibodies. J Thromb Thrombolysis 2024:10.1007/s11239-024-03001-1. [PMID: 38762712 DOI: 10.1007/s11239-024-03001-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/07/2024] [Indexed: 05/20/2024]
Abstract
BACKGROUND Antiphospholipid antibody syndrome (APS) is an acquired autoimmune disorder characterized by recurrent venous or arterial thrombosis and/or pregnancy complications. Recently, thrombotic APS was linked to increased neutrophil extracellular traps (NET) formation, suggesting an association between NETs and the severity of APS-related thrombosis. METHODS We performed a retrospective study on patients tested for presence of antiphospholipid antibodies (990 negative and 374 positive) to evaluate the association between the neutrophil activation state, estimated by the neutrophil reactive index (NEU-RI), a parameter routinely available from some haematology analysers, and antiphospholipid antibodies. RESULTS We do not observe a difference in NEU-RI values between positive and negative patients globally. However, interestingly, we highlight an association between high titers of IgM and low NEU-RI values indicating a lower neutrophil activation. CONCLUSION Our data are in line with the recent questioning about the putative clinical consistency of positive solid-phase aPL IgM.
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Affiliation(s)
- Sylvie Bouvier
- Department of Hematology, Nîmes University Hospital, Place du Professeur Robert Debré, Nîmes, 30029, France.
- Desbrest Institute of Epidemiology and Public Health, Univ Montpellier, INSERM, University of Montpellier, Montpellier, France.
- Faculty of Pharmaceutical and Biological Sciences, University of Montpellier, Montpellier, France.
| | - Mathieu Fortier
- Department of Hematology, Nîmes University Hospital, Place du Professeur Robert Debré, Nîmes, 30029, France
| | - Eva Nouvellon
- Department of Hematology, Nîmes University Hospital, Place du Professeur Robert Debré, Nîmes, 30029, France
- Desbrest Institute of Epidemiology and Public Health, Univ Montpellier, INSERM, University of Montpellier, Montpellier, France
| | - Ariane Olivan
- Department of Hematology, Nîmes University Hospital, Place du Professeur Robert Debré, Nîmes, 30029, France
| | - Mathias Chéa
- Department of Hematology, Nîmes University Hospital, Place du Professeur Robert Debré, Nîmes, 30029, France
- Desbrest Institute of Epidemiology and Public Health, Univ Montpellier, INSERM, University of Montpellier, Montpellier, France
| | - Jean-Christophe Gris
- Department of Hematology, Nîmes University Hospital, Place du Professeur Robert Debré, Nîmes, 30029, France
- Desbrest Institute of Epidemiology and Public Health, Univ Montpellier, INSERM, University of Montpellier, Montpellier, France
- Faculty of Pharmaceutical and Biological Sciences, University of Montpellier, Montpellier, France
- I.M. Sechenov First Moscow State Medical University, Moscow, Russian Federation
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Zen M, Tonello M, Favaro M, Del Ross T, Calligaro A, Giollo A, Vesentini F, Gennaio IA, Arru F, Ruffatti A, Doria A. Antiphospholipid antibody carriers and patients with quiescent antiphospholipid syndrome show persistent subclinical complement activation. Rheumatology (Oxford) 2024; 63:1733-1738. [PMID: 37774001 DOI: 10.1093/rheumatology/kead517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/20/2023] [Accepted: 09/01/2023] [Indexed: 10/01/2023] Open
Abstract
OBJECTIVES Complement activation has been advocated as one mechanism by which aPLs can induce thrombosis. In patients with catastrophic APS or re-thrombosis, enhanced complement activation has been shown, even in the quiescent phase of the disease. We aimed to assess complement activation and to investigate its association with clinical variables in aPL-positive patients with a favourable disease course. METHODS Subjects with at least two consecutive positive aPL results obtained ≥12 weeks apart were enrolled. They were subjects without a history of thrombosis or pregnancy morbidity (aPL carriers), patients with pregnancy morbidity alone, i.e. obstetric APS patients (OAPS patients), and/or patients with arterial, venous, or small-vessel thrombotic APS (TAPS patients); for enrolment, all patients were required to have been free of symptoms for ≥2 years. Patients affected with systemic autoimmune diseases were excluded. Healthy age- and sex-matched subjects were included as controls. Plasma C5a and C5b-9 levels were assessed by commercially available ELISA assays. The non-parametric Mann-Whitney test and Spearman's correlation were applied. RESULTS Thirty-seven OAPS patients, 38 TAPS patients, 42 aPL carriers and 30 healthy subjects were enrolled. The median C5a and C5b-9 levels were significantly higher in quiescent aPL-positive patients (OAPS, TAPS, aPL carriers) compared with controls: C5a ng/ml 10.61 [interquartile range (IQR) 6.87-15.46] vs 4.06 (2.66-7.35), P < 0.001; C5b-9 ng/ml 283.95 (175.8-439.40) vs 165.90 (124.23-236.8), P < 0.001. Similar C5a and C5b-9 levels were observed in OAPS and TAPS patients and aPL carriers. A positive correlation between the median C5b-9 levels and the number of aPL-positive tests was found (P = 0.002). CONCLUSION The persistence of aPL antibodies is associated with a persistent subclinical activation of the complement cascade.
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Affiliation(s)
- Margherita Zen
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Marta Tonello
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Maria Favaro
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Teresa Del Ross
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Antonia Calligaro
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Alessandro Giollo
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Filippo Vesentini
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Ilenia Anna Gennaio
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Federico Arru
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Amelia Ruffatti
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
| | - Andrea Doria
- Department of Medicine, Rheumatology Unit, University of Padua, Padova, Italy
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Raschi E, Borghi MO, Tedesco F, Meroni PL. Antiphospholipid syndrome pathogenesis in 2023: an update of new mechanisms or just a reconsideration of the old ones? Rheumatology (Oxford) 2024; 63:SI4-SI13. [PMID: 38320591 DOI: 10.1093/rheumatology/kead603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 10/27/2023] [Indexed: 02/08/2024] Open
Abstract
Antibodies against phospholipid (aPL)-binding proteins, in particular, beta 2 glycoprotein I (β2GPI), are diagnostic/classification and pathogenic antibodies in antiphospholipid syndrome (APS). β2GPI-aPL recognize their target on endothelium and trigger a pro-thrombotic phenotype which is amplified by circulating monocytes, platelets and neutrophils. Complement activation is required as supported by the lack of aPL-mediated effects in animal models when the complement cascade is blocked. The final result is a localized clot. A strong generalized inflammatory response is associated with catastrophic APS, the clinical variant characterized by systemic thrombotic microangiopathy. A two-hit hypothesis was suggested to explain why persistent aPL are associated with acute events only when a second hit allows antibody/complement binding by modulating β2GPI tissue presentation. β2GPI/β2GPI-aPL are also responsible for obstetric APS, being the molecule physiologically present in placental/decidual tissues. Additional mechanisms mediated by aPL with different characteristics have been reported, but their diagnostic/prognostic value is still a matter of research.
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Affiliation(s)
- Elena Raschi
- Immunorheumatology Research Laboratory, IRCCS Istituto Auxologico Italiano, Milan, Italy
| | - Maria Orietta Borghi
- Immunorheumatology Research Laboratory, IRCCS Istituto Auxologico Italiano, Milan, Italy
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Francesco Tedesco
- Immunorheumatology Research Laboratory, IRCCS Istituto Auxologico Italiano, Milan, Italy
| | - Pier Luigi Meroni
- Immunorheumatology Research Laboratory, IRCCS Istituto Auxologico Italiano, Milan, Italy
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6
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Andreoli L, Regola F, Caproli A, Crisafulli F, Fredi M, Lazzaroni MG, Nalli C, Piantoni S, Zatti S, Franceschini F, Tincani A. Pregnancy in antiphospholipid syndrome: what should a rheumatologist know? Rheumatology (Oxford) 2024; 63:SI86-SI95. [PMID: 38320595 DOI: 10.1093/rheumatology/kead537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 09/03/2023] [Indexed: 02/08/2024] Open
Abstract
This review focuses on the management of reproductive issues in women who have antiphospholipid syndrome (APS) or are carriers of antiphospholipid antibodies (aPL). The importance of aPL detection during preconception counselling relies on their pathogenic potential for placental insufficiency and related obstetric complications. The risk of adverse pregnancy outcomes can be minimized by individualized risk stratification and tailored treatment aimed at preventing placental insufficiency. Combination therapy of low-dose acetylsalicylic acid and heparin is the mainstay of prophylaxis during pregnancy; immunomodulation, especially with hydroxychloroquine, should be considered in refractory cases. Supplementary ultrasound surveillance is useful to detect fetal growth restriction and correctly tailor the time of delivery. The individual aPL profile must be considered in the stratification of thrombotic risk, such as during assisted reproduction techniques requiring hormonal ovarian stimulation or during the follow-up after pregnancy in order to prevent the first vascular event.
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Affiliation(s)
- Laura Andreoli
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Francesca Regola
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Alessia Caproli
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Francesca Crisafulli
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Micaela Fredi
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Maria-Grazia Lazzaroni
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Cecilia Nalli
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Silvia Piantoni
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Sonia Zatti
- Department of Obstetrics and Gynaecology, ASST Spedali Civili, Brescia, Italy
| | - Franco Franceschini
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Angela Tincani
- Rheumatology and Clinical Immunology Unit - ERN ReCONNET, ASST Spedali Civili; Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
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7
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Müller-Calleja N, Ruf W, Lackner KJ. Lipid-binding antiphospholipid antibodies: significance for pathophysiology and diagnosis of the antiphospholipid syndrome. Crit Rev Clin Lab Sci 2024:1-18. [PMID: 38293818 DOI: 10.1080/10408363.2024.2305121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 01/10/2024] [Indexed: 02/01/2024]
Abstract
The antiphospholipid syndrome (APS) is an autoimmune disease characterized by the presence of pathogenic antiphospholipid antibodies (aPL). Since approximately 30 years ago, lipid-binding aPL, which do not require a protein cofactor, have been regarded as irrelevant for APS pathogenesis even though anticardiolipin are a diagnostic criterion of APS. In this review, we will summarize the available evidence from in vitro studies, animal models, and epidemiologic studies, which suggest that this concept is no longer tenable. Accordingly, we will only briefly touch on the role of other aPL in APS. This topic has been amply reviewed in detail elsewhere. We will discuss the consequences for laboratory diagnostics and future research required to resolve open questions related to the pathogenic role of different aPL specificities.
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Affiliation(s)
- Nadine Müller-Calleja
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
- Center for Thrombosis and Hemostasis (CTH), University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
| | - Wolfram Ruf
- Center for Thrombosis and Hemostasis (CTH), University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
- Department of Immunology and Microbiology, Scripps Research, La Jolla, CA, USA
| | - Karl J Lackner
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
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8
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Kmeťová K, Lonina E, Yalavarthi S, Levine JS, Hoy CK, Sarosh C, Gockman K, Morris AE, Tambralli A, Madison JA, Zuo Y, Subang R, Rauch J, Knight JS. Interaction of the antiphospholipid syndrome autoantigen beta-2 glycoprotein I with DNA and neutrophil extracellular traps. Clin Immunol 2023; 255:109714. [PMID: 37527733 DOI: 10.1016/j.clim.2023.109714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/26/2023] [Accepted: 07/28/2023] [Indexed: 08/03/2023]
Abstract
Beta-2 glycoprotein I (β2GPI) is a phospholipid-binding plasma protein and prominent autoantigen in antiphospholipid syndrome (APS). Here, we tested the hypothesis that β2GPI might bind to not only phospholipids, but also cell-free DNA and neutrophil extracellular traps (NETs). We report that β2GPI interacts with cell-free DNA from different species, as well as NETs, in a dose-dependent manner, retarding their migration in an agarose-gel electrophoretic mobility shift assay. We confirm the direct binding interaction of β2GPI with DNA and NETs by ELISA. We also demonstrate that β2GPI colocalizes with NET strands by immunofluorescence microscopy. Finally, we provide evidence that β2GPI-DNA complexes can be detected in the plasma of APS patients, where they positively correlate with an established biomarker of NET remnants. Taken together, our findings indicate that β2GPI interacts with DNA and NETs, and suggest that this interaction may play a role as a perpetuator and/or instigator of autoimmunity in APS.
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Affiliation(s)
- Katarína Kmeťová
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA; Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, Bratislava, Slovakia
| | - Elena Lonina
- Division of Rheumatology, Department of Medicine, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Srilakshmi Yalavarthi
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Jerrold S Levine
- Section of Nephrology, Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA; Section of Nephrology, Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, IL, USA
| | - Claire K Hoy
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Cyrus Sarosh
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Kelsey Gockman
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Alexandra E Morris
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Ajay Tambralli
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Jacqueline A Madison
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Yu Zuo
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Rebecca Subang
- Division of Rheumatology, Department of Medicine, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Joyce Rauch
- Division of Rheumatology, Department of Medicine, McGill University, Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Jason S Knight
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA.
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Reshetnyak T, Nurbaeva K. The Role of Neutrophil Extracellular Traps (NETs) in the Pathogenesis of Systemic Lupus Erythematosus and Antiphospholipid Syndrome. Int J Mol Sci 2023; 24:13581. [PMID: 37686381 PMCID: PMC10487763 DOI: 10.3390/ijms241713581] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 08/10/2023] [Accepted: 08/30/2023] [Indexed: 09/10/2023] Open
Abstract
Systemic lupus erythematosus (SLE) is a systemic autoimmune disease of unknown aetiology [...].
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Affiliation(s)
- Tatiana Reshetnyak
- Department of Thromboinflammation, V.A. Nasonova Research Institute of Rheumatology, 115522 Moscow, Russia;
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