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Devreese KMJ. Noncriteria antiphospholipid antibodies in antiphospholipid syndrome. Int J Lab Hematol 2024; 46 Suppl 1:34-42. [PMID: 38584293 DOI: 10.1111/ijlh.14268] [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: 01/26/2024] [Accepted: 02/28/2024] [Indexed: 04/09/2024]
Abstract
Antiphospholipid syndrome (APS) is an autoimmune disease characterized by thrombotic manifestations and/or obstetric complications in patients with persistently positive antiphospholipid antibodies (aPL). aPL are a heterogeneous group of autoantibodies, but only lupus anticoagulant, anticardiolipin (aCL), and antibeta2-glycoprotein I antibodies (aβ2GPI) IgG or IgM are included as laboratory classification criteria. Seronegative APS patients are usually defined as patients with the clinical symptoms of APS but who test negative for aPL. The negativity to classic aPL criteria does not exclude the presence of other aPL. Several noncriteria aPL have been identified. Some noncriteria aPL are well studied, such as IgA aCL and aβ2GPI, the antiphosphatidylserine-prothrombin (aPS/PT) antibodies, and the antibodies against the domain I of beta2-glycoprotein I (aDI), both latter groups receiving more attention for their role in thrombotic events and pregnancy complications. Other noncriteria aPL that have been studied are antibodies against annexin V, prothrombin, phosphatidylethanolamine, phosphatidic acid, phosphatidylserine, phosphatidylinositol, vimentin-cardiolipin complex, anti-protein S/protein C. Measurement of some of these noncriteria aPL (aPS/PT, aDI) is useful in the laboratory work-out of APS in specific situations. We have to differentiate between patients who are positive for noncriteria aPL only, and patients who have both criteria and noncriteria aPL to enable us to study their role in the diagnosis or risk stratification of APS. The research on noncriteria aPL is continually developing as the clinical relevance of these antibodies is not yet fully clarified.
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Affiliation(s)
- Katrien M J Devreese
- Coagulation Laboratory, Ghent University Hospital, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
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Zhu R, Cheng GY, Denas G, Pengo V. Antiphospholipid antibodies in chronic thromboembolic pulmonary hypertension. Eur J Intern Med 2023; 111:1-4. [PMID: 36642578 DOI: 10.1016/j.ejim.2023.01.012] [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] [Received: 11/25/2022] [Revised: 01/07/2023] [Accepted: 01/11/2023] [Indexed: 01/15/2023]
Abstract
Acquired thrombophilia and in particular the presence of antiphospholipid antibodies (aPL) may play an important role in the development of chronic thromboembolic pulmonary hypertension (CTEPH). Young patients suffering from an episode of unprovoked pulmonary embolism (PE), or PE provoked by mild risk factors, should be tested for aPL. In case of a positive result, they should be closely followed up and lifelong anticoagulant treatment should be considered. Indeed, aPL-induced thrombophilia may favor PE recurrence with the consequence of possible CTEPH development. The aPL profiles play an important role in this pathway. Patients with PE and triple positivity (lupus anticoagulant, LAC, anti-cardiolipin, aCL, and anti-β2-glycoprotein I, aβ2GPI) are at the highest risk of recurrence and deserve maximum protection by anticoagulant treatment with warfarin.
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Affiliation(s)
- Rui Zhu
- Department of Endocrinology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China
| | - Gang-Yi Cheng
- Department of Cardiac Surgery, The First Affiliated Hospital of XiaMen University, XiaMen, China
| | - Gentian Denas
- Department of Cardio-Thoracic-Vascular Sciences and Public Health, Thrombosis Research Laboratory, University of Padua, Padua, Italy
| | - Vittorio Pengo
- Department of Cardio-Thoracic-Vascular Sciences and Public Health, Thrombosis Research Laboratory, University of Padua, Padua, Italy; Arianna Foundation on Anticoagulation, Bologna, Italy.
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Serrano M, Espinosa G, Serrano A, Cervera R. COVID-19 and the antiphospholipid syndrome. Autoimmun Rev 2022; 21:103206. [PMID: 36195247 PMCID: PMC9527199 DOI: 10.1016/j.autrev.2022.103206] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 09/28/2022] [Indexed: 01/08/2023]
Abstract
Coronavirus disease 2019 (COVID-19) has resulted in a global pandemic. Most COVID-19 patients are asymptomatic or have flu-like symptoms. However, around 15% of the patients may have severe disease, including unilateral or bilateral pneumonia with acute respiratory distress syndrome and progressive hypoxemia that may require mechanical ventilation assistance. A systemic inflammatory response syndrome occurs in the most severe forms of COVID-19, with multiorgan involvement which can be life threatening caused by a cytokine storm. Although what best characterizes COVID-19 are the manifestations of the respiratory system, it has been shown that it also acts at the cardiovascular level, producing coagulation abnormalities, which causes thrombotic events mainly in the arteries/arterioles, microcirculation and venous system, and potentially increased mortality risk. This multiorgan vascular disease overlaps with other known microangiopathies, such as thrombotic microangiopathy or paroxysmal nocturnal hemoglobinuria, where complement overactivation plays an important role in the pathophysiology of thrombosis. Furthermore, coagulopathy secondary to COVID-19 occurs in the context of an uncontrolled inflammatory response, reminiscent of APS, especially in its catastrophic form. This review summarizes the current knowledge regarding the relationship between COVID-19 and the APS.
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Affiliation(s)
- Manuel Serrano
- Department of Immunology, Healthcare Research Institute I+12, Hospital 12 de Octubre, Madrid, Spain
| | - Gerard Espinosa
- Department of Autoimmune Diseases, Hospital Clínic, Insititut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Catalonia, Spain
| | - Antonio Serrano
- Department of Immunology, Healthcare Research Institute I+12, Hospital 12 de Octubre, Madrid, Spain
| | - Ricard Cervera
- Department of Autoimmune Diseases, Hospital Clínic, Insititut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Catalonia, Spain,Corresponding author at: Servei de Malalties Autoimmunes, Hospital Clínic, Villarroel, 170, 08036 Barcelona, Catalonia, Spain
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Zouboulis CC, Theodoridis A, Makrantonaki E. Inflammation and thrombo-occlusive vessel signalling in benign atrophic papulosis (Köhlmeier-Degos disease). J Eur Acad Dermatol Venereol 2022; 36:2195-2198. [PMID: 35748122 DOI: 10.1111/jdv.18362] [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: 03/18/2022] [Accepted: 06/03/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND Although the merely cutaneous, benign form of the extremely rare disease atrophic papulosis (Köhlmeier-Degos disease) may occasionally develop into the systemic, malignant form with time, it is unclear whether it itself exhibits any systemic characteristics. OBJECTIVE To determine whether benign atrophic papulosis exhibits inflammatory and thrombo-occlusive signals and to classify it according to the Chapel-Hill classification of vasculitis. METHODS In a monocentric, controlled study, levels of cytokines (IL-1β, IL-6, IL-8, IFNγ, MCP-1, VEGF, TNFα, TGF-β1), antiphospholipid antibodies (cardiolipin IgG/A/M, cardiolipin IgG, cardiolipin IgM, β2-glycoprotein IgG/A/M, phosphatidyl choline, phosphatidyl serine, phosphatidyl inositol, phosphatidyl ethanolamine and sphingomyelin A), antibodies against proteinase-3 IgG and myeloperoxidase IgG, antinuclear antibodies and extractable nuclear antigen were assessed in blood samples of six benign atrophic papulosis patients and six age- and sex-matched healthy controls. RESULTS IL-8 was only detectable in patients' serum. VEGF was reduced and cardiolipin IgG/A/M and β2-glycoprotein antibodies were increased in the patients' group. ANA were only detected in three patients, ENA were throughout negative. No differences were detected between the other investigated markers. CONCLUSIONS This is the first study evaluating systemic inflammatory and thrombo-occlusive vessel signalling in benign atrophic papulosis and provide evidence of a non-antineutrophil cytoplasmatic antibodies immune-complex small vessel vasculitis according to the Chapel-Hill classification. These findings corroborate its systemic character despite the apparent missing involvement of systemic organs.
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Affiliation(s)
- C C Zouboulis
- Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg, Brandenburg, Dessau, Germany
| | - A Theodoridis
- Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg, Brandenburg, Dessau, Germany
| | - E Makrantonaki
- Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg, Brandenburg, Dessau, Germany
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Abstract
The diagnosis of antiphospholipid syndrome (APS) relies on the detection of circulating antiphospholipid antibodies (aPL). Currently, lupus anticoagulant (LA), anticardiolipin (aCL), and anti-β2-glycoprotein I antibodies (aβ2GPI) IgG or IgM are the laboratory criteria if persistently present over time. As aCL and aβ2GPI are two out of the three laboratory criteria, the detection of aPL by solid phase assays is an essential step in the diagnosis of APS. Advancement has been made to resolve some of the methodological challenges of aCL and aβ2GPI assays by providing guidelines how to measure aPL, as well as to gain a better understanding of their diagnostic role. However, solid phase assays for aCL and aβ2GPI still show substantive inter-assay differences, resulting in disagreement concerning positive/negative results, but also differences in titer of antibodies. This hampers the semiquantitative classification into low-medium-high positivity. The non-criteria aPL, such as antibodies against the domain one of β2GPI and anti-phosphatidylserine/prothrombin antibodies (aPS/PT) have roles in confirming the risk in APS, and can be useful, especially in patients with incomplete antibody profiles.
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Affiliation(s)
- Katrien M J Devreese
- Department of Diagnostic Sciences, Coagulation Laboratory, Ghent University Hospital, Ghent University, Ghent, Belgium
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Vandevelde A, Devreese KMJ. Laboratory Diagnosis of Antiphospholipid Syndrome: Insights and Hindrances. J Clin Med 2022; 11:jcm11082164. [PMID: 35456258 PMCID: PMC9025581 DOI: 10.3390/jcm11082164] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 04/08/2022] [Indexed: 12/11/2022] Open
Abstract
Diagnosis of antiphospholipid syndrome (APS) requires the presence of a clinical criterion (thrombosis and/or pregnancy morbidity), combined with persistently circulating antiphospholipid antibodies (aPL). Currently, laboratory criteria aPL consist of lupus anticoagulant (LAC), anticardiolipin antibodies (aCL) IgG/IgM, and anti-β2 glycoprotein I antibodies (aβ2GPI) IgG/IgM. Diagnosis and risk stratification of APS are complex and efforts to standardize and optimize laboratory tests have been ongoing since the initial description of the syndrome. LAC detection is based on functional coagulation assays, while aCL and aβ2GPI are measured with immunological solid-phase assays. LAC assays are especially prone to interference by anticoagulation therapy, but strategies to circumvent this interference are promising. Alternative techniques such as thrombin generation for LAC detection and to estimate LAC pathogenicity have been suggested, but are not applicable yet in routine setting. For aCL and aβ2GPI, a lot of different assays and detection techniques such as enzyme-linked immunosorbent and chemiluminescent assays are available. Furthermore, a lack of universal calibrators or standards results in high variability between the different solid-phase assays. Other non-criteria aPL such as anti-domain I β2 glycoprotein I and antiphosphatidylserine/prothrombin antibodies have been suggested for risk stratification purposes in APS, while their added value to diagnostic criteria seems limited. In this review, we will describe laboratory assays for diagnostic and risk evaluation in APS, integrating applicable guidelines and classification criteria. Current insights and hindrances are addressed with respect to both laboratory and clinical implications.
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Affiliation(s)
- Arne Vandevelde
- Department of Diagnostic Sciences, Ghent University, 9000 Gent, Belgium;
- Coagulation Laboratory, Ghent University Hospital, 9000 Gent, Belgium
| | - Katrien M. J. Devreese
- Department of Diagnostic Sciences, Ghent University, 9000 Gent, Belgium;
- Coagulation Laboratory, Ghent University Hospital, 9000 Gent, Belgium
- Correspondence:
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Yacoub MS, Khine J, Najar A, Yadlapalli S. Evidence of Thrombogenesis Recurrence Induced by IgA Antiphospholipid Antibody β2 Glycoprotein I-Dependent in Early Adulthood. Cureus 2022; 14:e23535. [PMID: 35495019 PMCID: PMC9045554 DOI: 10.7759/cureus.23535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/27/2022] [Indexed: 11/10/2022] Open
Abstract
Antiphospholipid antibodies (aPLs) against Beta-2 glycoprotein-I (β2GPI) are considered to be the center of pathogenesis of antiphospholipid syndrome (APS). Autoimmune aPLs are pathogenic as patients are at increased risk of enhancing thrombin generation at a young age. There are only three aPLs considered as diagnostic laboratory markers for APS - IgM, IgG, and IgA isotypes. However, the association of the IgA isotypes with clinical thrombosis remains highly controversial. A 30-year-old male with a past medical history of childhood asthma initially presented to the hospital with acute left middle cerebral artery ischemic stroke, which did not get resolved with tissue plasminogen activator (tPA) but was successfully resolved with thromboembolectomy. It was speculated to be associated with a clot from mitral valve prolapse found subsequently on echocardiogram. Twenty-eight days later, the patient presented again with a high-grade luminal narrowing of his mid- and distal left internal carotid artery with 80% narrowing and an acute dissection of his left internal carotid artery. The recurrence of thrombosis was evaluated through hypercoagulable state workup, which demonstrated evidence of antiphospholipid syndrome with elevated beta-2 glycoprotein IgA antibody titers of more than 150 U/mL. This is one of the first cases reported nationwide as evidence of thrombogenesis recurrence induced by IgA antiphospholipid antibody β2 glycoprotein I-dependent in early adulthood. IgA anti- β2GPI antibodies are found to have an association with many clinical manifestations of antiphospholipid syndrome and thrombotic events, particularly arterial thrombosis. To determine the link between the IgA-aβ2GPI antibodies and APS-events in asymptomatic individuals before recommending preventive treatments, there needs to be a broader intention to standardize IgA-aβ2GPI assays as a diagnostic criterion for APS.
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Al-Mughales JA. Anti-Nuclear Antibodies Patterns in Patients With Systemic Lupus Erythematosus and Their Correlation With Other Diagnostic Immunological Parameters. Front Immunol 2022; 13:850759. [PMID: 35359932 PMCID: PMC8964090 DOI: 10.3389/fimmu.2022.850759] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Accepted: 02/18/2022] [Indexed: 11/20/2022] Open
Abstract
Background Antinuclear antibodies (ANA) are major immunodiagnostic tools in systemic lupus erythematosus (SLE); however, their clinical and pathogenic roles are not yet elucidated and are a subject of controversy. Objectives The aim of the study is to explore the pathogenic significance of ANA patterns among SLE patients, by analyzing their association with ANA titers, complement levels and other pathogenic immune markers, namely, anti-double-stranded DNA (anti-dsDNA), complements C3 and C4, rheumatoid factor (RF), anticardiolipin antibodies IgG (ACL IgG) and IgM (ACL IgM), Beta-2 Glycoprotein 1 Antibodies (β2-GP) IgG (β2-IgM) and IgM (β2-IgM), and lupus anticoagulant (LA). Method A comparative cross-sectional study was conducted among 495 SLE patients, who were diagnosed and classified by consultant rheumatologists according to the new European League Against Rheumatism (EULAR)/American College of Rheumatology (ACR) 2019 criteria. SLE immunodiagnostic profiles were analyzed including the following parameters: ANA antibody titers and staining patterns, anti-dsDNA, C3 and C4 levels, aCL, and anti-β2-GP and LA. Result The most frequently observed ANA patterns were the speckled (52.1%) and homogeneous (35.2%) patterns, while other patterns were rare representing less than 7% of the patients each. ANA titers were highest in patients with mixed pattern followed by the speckled pattern. Of all the investigated patterns, the peripheral pattern showed the most pathogenic immune profile, namely, highest levels of anti-dsDNA, lowest levels of C4, and highest levels of aCL and β2-GP IgG and IgM. Conclusion This retrospective study showed that speckled followed by homogeneous ANA patterns were predominant accounting for 52.1 and 35.2% of the patients. The ANA pattern showed several associations with other immune markers that are documented to have significant clinical implications in SLE. Peripheral, mixed, and speckled patterns were associated with higher profiles of immune markers indicative of a potential prognostic value of these patterns in SLE.
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Affiliation(s)
- Jamil A. Al-Mughales
- Department of Medical Microbiology and Parasitology, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Clinical Laboratory Medicine, Diagnostic Immunology Division, King Abdulaziz University Hospital, Jeddah, Saudi Arabia
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Devreese KM, Zuily S, Meroni PL. Role of antiphospholipid antibodies in the diagnosis of antiphospholipid syndrome. J Transl Autoimmun 2021; 4:100134. [PMID: 34816113 PMCID: PMC8592860 DOI: 10.1016/j.jtauto.2021.100134] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 11/05/2021] [Indexed: 01/07/2023] Open
Abstract
The diagnosis of antiphospholipid syndrome (APS) relies on the detection of antiphospholipid antibodies (aPL). Currently, lupus anticoagulant (LA), anticardiolipin (aCL), and antibeta2-glycoprotein I antibodies (aβ2GPI) IgG or IgM are included as laboratory criteria, if persistently present. LAC measurement remains a complicated procedure with many pitfalls and interfered by anticoagulant therapy. Solid-phase assays for aCL and aβ2GPI show interassay differences. These methodological issues make the laboratory diagnosis of APS challenging. In the interpretation of aPL results, antibody profiles help in identifying patients at risk. Other aPL, such as antibodies against the domain I of beta2-glycoprotein (aDI) and antiphosphatidylserine-prothrombin (aPS/PT) antibodies have been studied in the last years and may be useful in risk stratification of APS patients. Because of the methodological shortcomings of immunological and clotting assays, these non-criteria aPL may be useful in patients with incomplete antibody profiles to confirm or exclude the increased risk profile. This manuscript will focus on the laboratory aspects, the clinical relevance of assays and interpretation of aPL results in the diagnosis of APS. The presence of antiphospholipid antibodies (aPL) define the diagnosis of the antiphospholipid syndrome (APS). Laboratory criteria are lupus anticoagulant, anticardiolipin (aCL), and antibeta2-glycoprotein I antibodies (aβ2GPI) IgG/IgM. Lupus anticoagulant measurement, as well as solid phase assays for aCL and aβ2GPI, show methodological challenges. Antibodies against domain I of β2GPI (aDI) and antiphosphatidylserine-prothrombin (aPS/PT) antibodies are non-criteria aPL. aDI and aPS/PT may be useful in risk stratification of APS patients.
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Affiliation(s)
- Katrien M.J. Devreese
- Coagulation Laboratory, Ghent University Hospital, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
- Corresponding author. Coagulation Laboratory, Ghent University Hospital, Corneel Heymanslaan 10, 9000, Gent, Belgium.
| | - Stéphane Zuily
- Université de Lorraine, Inserm, DCAC, Vascular Medicine Division and Regional Competence Center for Rare Vascular and Systemic Autoimmune Diseases, Centre Hospitalier Regional Universitaire de Nancy, 54000, Nancy, France
| | - Pier Luigi Meroni
- Experimental Laboratory of Immunological and Rheumatologic Researches, Istituto Auxologico Italiano–Istituto di Ricovero e Cura a Carattere Scientifico, Milano, Italy
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Foret T, Dufrost V, Salomon Du Mont L, Costa P, Lefevre B, Lacolley P, Regnault V, Zuily S, Wahl D. Systematic Review of Antiphospholipid Antibodies in COVID-19 Patients: Culprits or Bystanders? Curr Rheumatol Rep 2021; 23:65. [PMID: 34218350 PMCID: PMC8254447 DOI: 10.1007/s11926-021-01029-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/22/2021] [Indexed: 12/21/2022]
Abstract
PURPOSE OF REVIEW COVID-19 patients have a procoagulant state with a high prevalence of thrombotic events. The hypothesis of an involvement of antiphospholipid antibodies (aPL) has been suggested by several reports. Here, we reviewed 48 studies investigating aPL in COVID-19 patients. RECENT FINDINGS Prevalence of Lupus Anticoagulant (LA) ranged from 35% to 92% in ICU patients. Anti-cardiolipin (aCL) IgG and IgM were found in up to 52% and up to 40% of patients respectively. Anti-β2-glycoprotein I (aβ2-GPI) IgG and IgM were found in up to 39% and up to 34% of patients respectively. Between 1% and 12% of patients had a triple positive aPL profile. There was a high prevalence of aβ2-GPI and aCL IgA isotype. Two cohort studies found few persistent LA but more persistent solid phase assay aPL over time. aPL determination and their potential role is a real challenge for the treatment of this disease.
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Affiliation(s)
- Thomas Foret
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France
| | - Virginie Dufrost
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France
- CHRU-Nancy, Vascular Medicine Division and Regional Competence Center for Rare Vascular and Systemic Autoimmune Diseases, F-54000, Nancy, France
| | - Lucie Salomon Du Mont
- CHRU-Besancon, Vascular and Endovascular Surgery Department, F-25000, Besancon, France
- Université de Bourgogne Franche-Comté, EA3920, F-25000, Besancon, France
| | - Patricia Costa
- CHRU-Besancon, Vascular Medicine Unit, Vascular and Endovascular Surgery Department, F-25000, Besancon, France
| | - Benjamin Lefevre
- Université de Lorraine, CHRU-Nancy, Infectious and Tropical Diseases, F-54000, Nancy, France
- Université de Lorraine, APEMAC, F-54000, Nancy, France
| | | | | | - Stephane Zuily
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France
- CHRU-Nancy, Vascular Medicine Division and Regional Competence Center for Rare Vascular and Systemic Autoimmune Diseases, F-54000, Nancy, France
| | - Denis Wahl
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France.
- CHRU-Nancy, Vascular Medicine Division and Regional Competence Center for Rare Vascular and Systemic Autoimmune Diseases, F-54000, Nancy, France.
- INSERM UMR_S 1116 DCAC and CHRU-Nancy, Vascular Medicine Division and Regional Competence Center for Rare Auto-Immune Vascular Diseases, University of Lorraine, INSERM, University Hospital (CHRU) of Nancy, Nancy, France.
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Devreese KMJ. Testing for antiphospholipid antibodies: Advances and best practices. Int J Lab Hematol 2021; 42 Suppl 1:49-58. [PMID: 32543059 DOI: 10.1111/ijlh.13195] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 02/24/2020] [Accepted: 03/10/2020] [Indexed: 01/19/2023]
Abstract
The diagnosis of antiphospholipid syndrome (APS) relies on the detection of circulating antiphospholipid antibodies (aPL). Currently, lupus anticoagulant (LAC), anticardiolipin (aCL), and antibeta2-glycoprotein I antibodies (aβ2GPI) IgG or IgM are included as laboratory criteria if persistently present. Progress has been made on the standardization of tests as guidelines on LAC testing and immunological assays for aCL and aβ2GPI are published. However, LAC measurement remains a complicated procedure with many pitfalls and interfered by anticoagulant therapy. Solid-phase assays for aCL and aβ2GPI still show interassay differences. These methodological issues make the laboratory diagnosis of APS challenging. In the interpretation of aPL results, antibody profiles help in identifying patients at risk. Noncriteria aPL, such as antibodies against the domain I of beta2-glycoprotein (aDI) and antiphosphatidylserine-prothrombin (aPS/PT) antibodies have been studied in the last years and may be useful in risk stratification of APS patients. But, aDI and aPS/PT are not included in the current diagnostic criteria and testing in daily practice is not recommended as these antibodies have no added value in the diagnosis of APS. This review will focus on the technical aspects of the laboratory methods, the clinical relevance of assays and interpretation of aPL results in the diagnosis of APS.
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Affiliation(s)
- Katrien M J Devreese
- Department of Laboratory Medicine, Coagulation Laboratory, Ghent University Hospital, Ghent, Belgium.,Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
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RESULTADOS OBSTÉTRICOS EN GESTANTES DIAGNOSTICADAS DE SÍNDROME ANTIFOSFOLÍPIDO. REVISTA MÉDICA CLÍNICA LAS CONDES 2021. [DOI: 10.1016/j.rmclc.2020.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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The Weight of IgA Anti-β2glycoprotein I in the Antiphospholipid Syndrome Pathogenesis: Closing the Gap of Seronegative Antiphospholipid Syndrome. Int J Mol Sci 2020; 21:ijms21238972. [PMID: 33255963 PMCID: PMC7730063 DOI: 10.3390/ijms21238972] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/20/2020] [Accepted: 11/23/2020] [Indexed: 12/12/2022] Open
Abstract
The specific value of IgA Anti-β2glycoprotein I antibodies (aB2GP1) in the diagnosis and management of antiphospholipid syndrome (APS) is still controversial and a matter of active debate. The relevance of the IgA aB2GP1 isotype in the pathophysiology of APS has been increasingly studied in the last years. There is well know that subjects with multiple positive APS tests are at increased risk of thrombosis and/or miscarriage. However, these antibodies are not included in the 2006 APS classification criteria. Since 2010 the task force of the Galveston International Congress on APS recommends testing IgA aB2GP1 isotype in patients with APS clinical criteria in the absence of criteria antibodies. In this review, we summarize the molecular and clinical “state of the art” of the IgA aB2GP in the context of APS. We also discuss some of the characteristics that may help to evaluate the real value of the IgA aB2GP1 determination in basic research and clinical practice. The scientific community should be aware of the importance of clarifying the role of IgA aB2GP1 in the APS diagnosis.
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Funke A, Staub HL, Monticielo OA, Balbi GGM, Danowski A, Santiago MB, Andrade DCOD, Rêgo J. Non-criteria Antiphospholipid Antibodies: a narrative review. Rev Assoc Med Bras (1992) 2020; 66:1595-1601. [DOI: 10.1590/1806-9282.66.11.1595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 07/11/2020] [Indexed: 12/20/2022] Open
Abstract
SUMMARY The 2006 Revised Sapporo Classification Criteria for Definite Antiphospholipid Syndrome included as laboratory criteria the tests for antiphospholipid antibodies whose accuracy was regarded as satisfactory according to the evidence available at that time. In practice, however, the sensitivity and specificity of these “criteria” of antiphospholipid antibodies are sometimes insufficient for identifying or ruling out antiphospholipid syndrome. It has been studied whether the accuracy of the laboratory diagnosis of the syndrome could be improved by testing for non-criteria antiphospholipid antibodies. In this work, we review evidence on the clinical associations and diagnostic value of the most commonly studied non-criteria antibodies, namely: antiphosphatidylethanolamine, anti-annexin A5, anti-prothrombin, anti-phosphatidylserine/prothrombin complex, IgA anticardiolipin, and IgG anti-domain I of the β2 glycoprotein antibodies.
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Hu C, Li X, Zhao J, Wang Q, Li M, Tian X, Zeng X. Immunoglobulin A Isotype of Antiphospholipid Antibodies Does Not Provide Added Value for the Diagnosis of Antiphospholipid Syndrome in a Chinese Population. Front Immunol 2020; 11:568503. [PMID: 33123140 PMCID: PMC7573363 DOI: 10.3389/fimmu.2020.568503] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 09/14/2020] [Indexed: 12/23/2022] Open
Abstract
Objective Antiphospholipid syndrome (APS) is characterized by the presence of anti-phospholipid (aPL) antibodies. However, the relationship between the immunoglobulin (Ig) A isotype of aPL positivity and its clinical utility in APS diagnosis is controversial. Presently, we determine the clinical utility of IgA-aPL from consecutive patients in a large cohort from the Chinese population and patients with APS whose aPL profiles were obtained. Methods The detection of anticardiolipin (aCL) and anti-β2 glycoprotein-Ⅰ (aβ2GPⅠ) antibodies of the IgA/IgG/IgM isotype by paramagnetic particle chemiluminescent immunoassay was carried out in sera from 7293 subjects. 153 primary APS (PAPS) patients and 59 patients with secondary APS (SAPS) were included in this study. Results In total, 1,082 out of 7,293 (2.55%) subjects had a positive IgA-aPL test, and the prevalence of isolated IgA-aPL was 0.29% (21/7,293) in the general population. The prevalence of IgA-aPL in the PAPS patients was 12.42% (19/153); however, only one patient (0.65%) presented with isolated IgA-aPL. Fifty (25.9%) of the SAPS had IgA-aPL, none of whom lacked IgG/IgM-aPL. The combination of the IgA isotype and the IgG/IgM isotype did not increase the diagnostic performance when compared with the IgG/IgM isotype of aCL or aβ2GPⅠ, respectively. IgA-aPL was not associated with clinical manifestation in patients with APS. Conclusion Isolated IgA-aPL is rare in the general population as well as in patients with APS. Whether in the laboratory or in clinical practice, the presence of IgA-aPL does not provide added value for the diagnosis of APS in the Chinese population.
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Affiliation(s)
- Chaojun Hu
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Key Laboratory of Rheumatology & Clinical Immunology, Ministry of Education, Beijing, China.,National Clinical Research Center for Dermatologic and Immunologic Diseases (NCRC-DID), Beijing, China
| | - Xi Li
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Key Laboratory of Rheumatology & Clinical Immunology, Ministry of Education, Beijing, China.,Department of Clinical Laboratory, First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Jiuliang Zhao
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Key Laboratory of Rheumatology & Clinical Immunology, Ministry of Education, Beijing, China.,National Clinical Research Center for Dermatologic and Immunologic Diseases (NCRC-DID), Beijing, China
| | - Qian Wang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Key Laboratory of Rheumatology & Clinical Immunology, Ministry of Education, Beijing, China.,National Clinical Research Center for Dermatologic and Immunologic Diseases (NCRC-DID), Beijing, China
| | - Mengtao Li
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Key Laboratory of Rheumatology & Clinical Immunology, Ministry of Education, Beijing, China.,National Clinical Research Center for Dermatologic and Immunologic Diseases (NCRC-DID), Beijing, China
| | - Xinping Tian
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Key Laboratory of Rheumatology & Clinical Immunology, Ministry of Education, Beijing, China.,National Clinical Research Center for Dermatologic and Immunologic Diseases (NCRC-DID), Beijing, China
| | - Xiaofeng Zeng
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Key Laboratory of Rheumatology & Clinical Immunology, Ministry of Education, Beijing, China.,National Clinical Research Center for Dermatologic and Immunologic Diseases (NCRC-DID), Beijing, China
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16
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Devreese KMJ, Linskens EA, Benoit D, Peperstraete H. Antiphospholipid antibodies in patients with COVID-19: A relevant observation? J Thromb Haemost 2020; 18:2191-2201. [PMID: 32619328 PMCID: PMC7361253 DOI: 10.1111/jth.14994] [Citation(s) in RCA: 125] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/26/2020] [Accepted: 07/01/2020] [Indexed: 01/17/2023]
Abstract
BACKGROUND High incidence of thrombosis in COVID-19 patients indicates a hypercoagulable state. Hence, exploring the involvement of antiphospholipid antibodies (aPL) in these patients is of interest. OBJECTIVES To illustrate the incidence of criteria (lupus anticoagulant [LAC], anticardiolipin [aCL] immunoglobulin G [IgG]/IgM, antibeta2-glycoprotein I antibodies [aβ2GPI] IgG/IgM) and noncriteria (anti-phosphatidyl serine/prothrombin [aPS/PT], aCL, and aβ2GPI IgA) aPL in a consecutive cohort of critically ill SARS-CoV-2 patients, their association with thrombosis, antibody profile and titers of aPL. PATIENTS/METHODS Thirty-one consecutive confirmed COVID-19 patients admitted to the intensive care unit were included. aPL were measured at one time point, with part of the aPL-positive patients retested after 1 month. RESULTS Sixteen patients were single LAC-positive, two triple-positive, one double-positive, one single aCL, and three aCL IgG and LAC positive. Seven of nine thrombotic patients had at least one aPL. Sixteen of 22 patients without thrombosis were aPL positive, amongst them two triple positives. Nine of 10 retested LAC-positive patients were negative on a second occasion, as well as the double-positive patient. Seven patients were aPS/PT-positive associated to LAC. Three patients were aCL and aβ2GPI IgA-positive. CONCLUSION Our observations support the frequent single LAC positivity during (acute phase) observed in COVID-19 infection; however, not clearly related to thrombotic complications. Triple aPL positivity and high aCL/aβ2GPI titers are rare. Repeat testing suggests aPL to be mostly transient. Further studies and international registration of aPL should improve understanding the role of aPL in thrombotic COVID-19 patients.
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Affiliation(s)
- Katrien M J Devreese
- Coagulation Laboratory, Department of Laboratory Medicine, Ghent University Hospital, Ghent, Belgium
- Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Eleni A Linskens
- Coagulation Laboratory, Department of Laboratory Medicine, Ghent University Hospital, Ghent, Belgium
| | - Dominique Benoit
- Department of Intensive Care Medicine, Ghent University Hospital, Ghent, Belgium
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17
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Abstract
PURPOSE OF THE REVIEW This review focuses on the laboratory tests necessary for the diagnosis of antiphospholipid syndrome (APS). For the interpretation of the results of the tests for antiphospholipid antibodies (aPL), understanding of all pitfalls and interferences is necessary. RECENT FINDINGS Progress has been made on the standardization of aPL tests and current guidelines for detection of lupus anticoagulant (LAC), anticardiolipin antibodies (aCL), and antibeta2-glycoprotein I antibodies (aβ2GPI) are useful tools. LAC measurement remains a complex procedure with many pitfalls and interference by anticoagulant therapy. Solid phase assays for aCL and aβ2GPI still show inter-assay differences. Measuring LAC, aCL, and aβ2GPI allows making antibody profiles that help in identifying patients at risk. Other aPL, such as antibodies against domain I of beta2-glycoprotein I (aDI) and antiphosphatidylserine-prothrombin (aPS/PT) antibodies, may be useful in risk stratification of APS patients, but are not included in the current diagnostic criteria as no added value in the diagnosis of APS has been illustrated so far. The laboratory diagnosis of APS remains challenging. LAC, aCL, aβ2GPI IgG, and IgM should be performed to increase diagnostic efficacy, with an integrated interpretation of all results and an interpretative comment. A close interaction between clinical pathologists and clinicians is mandatory.
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Affiliation(s)
- Katrien M J Devreese
- Department of Laboratory Medicine, Coagulation Laboratory, Ghent University Hospital, Corneel Heymanslaan 10, 9000, Ghent, Belgium. .,Department of Diagnostic Sciences, Ghent University, Ghent, Belgium.
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18
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Beltagy A, Trespidi L, Gerosa M, Ossola MW, Meroni PL, Chighizola CB. Anti-phospholipid antibodies and reproductive failures. Am J Reprod Immunol 2020; 85:e13258. [PMID: 32347616 DOI: 10.1111/aji.13258] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 04/21/2020] [Accepted: 04/22/2020] [Indexed: 12/16/2022] Open
Abstract
Anti-phospholipid syndrome (APS) recapitulates the link between autoimmunity and pregnancy failure: Acquired anti-phospholipid antibodies (aPL) play a pathogenic role in pregnancy complications. The diagnosis of obstetric APS can easily be pursued when women present with laboratory and clinical features fulfilling the international classification criteria. Standard therapeutic approach to obstetric APS consists in the association of anti-platelet agents and anticoagulants. Most patients achieve a live birth thanks to conventional treatment; however, approximately 20% fail to respond and are managed with additional therapeutic tools added on the top of conventional treatment. Surely, a refinement of risk stratification tools would allow early identification of high-risk pregnancies that warrant tailored treatment. In real life, obstetricians and rheumatologists face complex diagnostic scenarios including women with pregnancy morbidities other than those mentioned in classification criteria such as one or two early losses and premature birth after 34 weeks due to preeclampsia or placental insufficiency, women with low-titer aPL not fulfilling criteria laboratory requirements, women with positive non-criteria aPL, asymptomatic aPL carriers, and infertile women found to be aPL-positive. This review focuses on some of the several unanswered questions related to diagnostic, prognostic, and therapeutic aspects in obstetric APS.
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Affiliation(s)
- Asmaa Beltagy
- Experimental Laboratory of Immunological and Rheumatologic Researches, Istituto Auxologico Italiano, IRCCS, Cusano Milanino, Milan, Italy.,Immunology and Rheumatology Unit, San Luca Hospital, Istituto Auxologico Italiano, IRCCS, Milan, Italy.,Rheumatology and Clinical Immunology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Laura Trespidi
- Department of Obstetrics and Gynaecology, Fondazione Cà Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Maria Gerosa
- Division of Clinical Rheumatology, Research Center for Adult and Pediatric Rheumatic Diseases, ASST G. Pini & CTO, Milan, Italy.,Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Manuela Wally Ossola
- Department of Obstetrics and Gynaecology, Fondazione Cà Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Pier Luigi Meroni
- Experimental Laboratory of Immunological and Rheumatologic Researches, Istituto Auxologico Italiano, IRCCS, Cusano Milanino, Milan, Italy.,Immunology and Rheumatology Unit, San Luca Hospital, Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | - Cecilia B Chighizola
- Experimental Laboratory of Immunological and Rheumatologic Researches, Istituto Auxologico Italiano, IRCCS, Cusano Milanino, Milan, Italy.,Immunology and Rheumatology Unit, San Luca Hospital, Istituto Auxologico Italiano, IRCCS, Milan, Italy
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19
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Cáliz Cáliz R, Díaz Del Campo Fontecha P, Galindo Izquierdo M, López Longo FJ, Martínez Zamora MÁ, Santamaría Ortiz A, Amengual Pliego O, Cuadrado Lozano MJ, Delgado Beltrán MP, Carmona Ortells L, Cervantes Pérez EC, Díaz-Cordovés Rego G, Garrote Corral S, Fuego Varela C, Martín López M, Nishishinya B, Novella Navarro M, Pereda Testa C, Sánchez Pérez H, Silva-Fernández L, Martínez Taboada VM. Recommendations of the Spanish Rheumatology Society for Primary Antiphospholipid Syndrome. Part I: Diagnosis, Evaluation and Treatment. REUMATOLOGIA CLINICA 2020; 16:71-86. [PMID: 30713012 DOI: 10.1016/j.reuma.2018.11.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/08/2018] [Accepted: 11/09/2018] [Indexed: 11/25/2022]
Abstract
OBJECTIVE The difficulty in diagnosis and the spectrum of clinical manifestations that can determine the choice of treatment for primary antiphospholipid syndrome (APS) has fostered the development of recommendations by the Spanish Society of Rheumatology (SER), based on the best possible evidence. These recommendations can serve as a reference for rheumatologists and other specialists involved in the management of APS. METHODS A panel of four rheumatologists, a gynaecologist and a haematologist with expertise in APS was created, previously selected by the SER through an open call or based on professional merits. The stages of the work were: identification of the key areas for drafting the document, analysis and synthesis of the scientific evidence (using the Scottish Intercollegiate Guidelines Network [SIGN] levels of evidence) and formulation of recommendations based on this evidence and formal assessment or reasoned judgement techniques (consensus techniques). RESULTS 46 recommendations were drawn up, addressing five main areas: diagnosis and evaluation, measurement of primary thromboprophylaxis, treatment for APS or secondary thromboprophylaxis, treatment for obstetric APS and special situations. These recommendations also include the role of novel oral anticoagulants, the problem of recurrences or the key risk factors identified in these subjects. This document reflects the first 21, referring to the areas of: diagnosis, evaluation and treatment of primary APS. The document provides a table of recommendations and treatment algorithms. CONCLUSIONS An update of the SER recommendations on APS is presented. This document corresponds to partI, related to diagnosis, evaluation and treatment. These recommendations are considered tools for decision-making for clinicians, taking into consideration both the decision of the physician experienced in APS and the patient. A partII has also been prepared, which addresses aspects related to obstetric SAF and special situations.
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Affiliation(s)
- Rafael Cáliz Cáliz
- Servicio de Reumatología, Hospital Universitario Virgen de las Nieves, Facultad de Medicina, Universidad de Granada, Granada, España.
| | | | | | | | - María Ángeles Martínez Zamora
- Unidad de Ginecología y Obstetricia, Hospital Clínic, Barcelona, España; Representante de la Sociedad Española de Ginecología y Obstetricia (SEGO), Madrid, España
| | - Amparo Santamaría Ortiz
- Unidad de Hemostasias y Trombosis, Servicio de Hematología, Hospital Vall d'Hebron, Barcelona, España; Representante de la Sociedad Española de Trombosis y Hemostasia (SETH), Madrid, España
| | - Olga Amengual Pliego
- Departamento de Reumatología, Endocrinología y Nefrología, Facultad de Medicina, Universidad de Hokkaido, Sapporo, Japón
| | | | | | | | | | | | | | - Clara Fuego Varela
- Servicio de Reumatología, Hospital Regional Universitario de Málaga. Hospital Civil, Málaga, España
| | - María Martín López
- Servicio de Reumatología, Hospital Universitario 12 de Octubre, Madrid, España
| | - Betina Nishishinya
- Servicio de Reumatología y Medicina del deporte, Clínica Quirón, Barcelona, España
| | | | | | - Hiurma Sánchez Pérez
- Servicio de Reumatología, Hospital Universitario de Canarias, Santa Cruz de Tenerife, España
| | - Lucia Silva-Fernández
- Servicio de Reumatología, Complexo Hospitalario Universitario de Ferrol, Ferrol, A Coruña, España
| | - Víctor Manuel Martínez Taboada
- Facultad de Medicina, Universidad de Cantabria; Servicio de Reumatología, Hospital Universitario Marqués de Valdecilla, Santander, España
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20
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Salle V. [Seronegative antiphospholipid syndrome: Myth or reality?]. Rev Med Interne 2020; 41:265-274. [PMID: 32115196 DOI: 10.1016/j.revmed.2020.02.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 12/23/2019] [Accepted: 02/02/2020] [Indexed: 10/24/2022]
Abstract
The antiphospholipid syndrome (APS) is a systemic autoimmune disease characterized by thrombosis and/or obstetrical manifestations and the persistent presence, at least 12 weeks apart, of antiphospholipid antibodies (aPL) such as lupus anticoagulant (LA) and/or anticardiolipin antibodies (ACL) and/or anti-β2 glycoprotein I antibodies (aβ2GPI). The finding of patients with clinical profile highly suggestive of APS but who are negative for conventional biological criteria has led to the concept of seronegative APS. In the last few years, new antigen targets and methodological approaches have been employed to more clearly identify this syndrome in patients with thrombosis or obstetrical complications without conventional aPL. Although seronegative APS is still controversial, there is increasing recognition of the existence of this subgroup. However, clinical relevance of non conventional aPL need to be confirmed by efforts toward standardizing new biological tools and longitudinal studies involving large cohort of patients.
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Affiliation(s)
- V Salle
- Service de médecine interne, CHU Amiens-Picardie, 1, place Victor-Pauchet, 80054 Amiens cedex 1, France; Laboratoire de biochimie recherche, CHU Amiens-Picardie, Amiens, France.
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21
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Liu T, Gu J, Wan L, Hu Q, Teng J, Liu H, Cheng X, Ye J, Su Y, Sun Y, Zhou J, Norman GL, Wang X, Yang C, Shi H. "Non-criteria" antiphospholipid antibodies add value to antiphospholipid syndrome diagnoses in a large Chinese cohort. Arthritis Res Ther 2020; 22:33. [PMID: 32085759 PMCID: PMC7035660 DOI: 10.1186/s13075-020-2131-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 02/14/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Despite expansion in the 2006 Sydney antiphospholipid syndrome (APS) classification criteria to include IgG/IgM anti-β2-glycoprotein (aβ2GPI) antibodies in addition to IgG/IgM anti-cardiolipin antibodies (aCL) and lupus anticoagulant (LAC), some individuals with clinical features of APS remain seronegative (seronegative APS or SNAPS) and are at risk of recurrent thrombosis and pregnancy morbidities. Our aim was to assess the value of "non-criteria" aPL antibodies to detect these SNAPS patients. METHODS One hundred ninety-two APS patients, 90 SNAPS patients, 193 autoimmune disease controls, and 120 healthy controls were evaluated. Ten antiphospholipid antibodies (aPLs) were tested using commercial kits, including 5 non-criteria aPLs: anti-phosphatidylserine/prothrombin antibodies (aPS/PT) IgG/IgM, aCL IgA, aβ2GPI IgA, and anti-β2GPI Domain 1 (aβ2GPI-D1) IgG. RESULTS Up to 60.9% of the SNAPS and 93.5% of APS patients were detected by at least one non-criteria aPL. aPS/PT IgG had the highest Youden index in classifying APS and SNAPS from controls. aPS/PT IgG and aβ2GPI Domain 1 IgG seem to be the most significant risk factors for thrombotic events and pregnancy morbidity, respectively. aPS/PT IgG/IgM and aβ2GPI-D1 IgG were detected in some SNAPS patients, while IgA isotypes of aCL/aβ2GPI tended to appear together with other biomarkers. The combined analysis showed enhanced diagnostic performance with the inclusion of non-criteria aPLs. CONCLUSIONS Recognition of SNAPS patients is critical for clinical management and prevention of potential thrombotic and obstetric adverse events. The non-criteria antiphospholipid antibodies help to identify a considerable portion (60.9%) of these patients who otherwise may remain untreated and at clinical risk.
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Affiliation(s)
- Tingting Liu
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Jieyu Gu
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Liyan Wan
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Qiongyi Hu
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Jialin Teng
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Honglei Liu
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Xiaobing Cheng
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Junna Ye
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Yutong Su
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Yue Sun
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China
| | - Jinfeng Zhou
- Werfen China, 10 Jiuxianqiao RD., Chaoyang District, Beijing, China
| | - Gary L Norman
- INOVA Diagnostics, Inc., 9900 Old Grove Road, San Diego, CA, 92131, USA
| | - Xuefeng Wang
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Chengde Yang
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China.
| | - Hui Shi
- Department of Rheumatology and Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, No. 197 Ruijin Second Road, Huangpu District, Shanghai, 200025, China.
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22
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Pignatelli P, Ettorre E, Menichelli D, Pani A, Violi F, Pastori D. Seronegative antiphospholipid syndrome: refining the value of "non-criteria" antibodies for diagnosis and clinical management. Haematologica 2020; 105:562-572. [PMID: 32001534 PMCID: PMC7049333 DOI: 10.3324/haematol.2019.221945] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 12/18/2019] [Indexed: 11/16/2022] Open
Abstract
Antiphospholipid syndrome (APS) is a systemic autoimmune disease characterized by arterial and venous thrombotic manifestations and/or pregnancy-related complications in patients with persistently high antiphospholipid antibodies (aPL), the most common being represented by anticardiolipin antibodies (aCL), anti-beta 2 glycoprotein-I (aβ2GPI), and lupus anticoagulant (LAC). A growing number of studies have showed that, in some cases, patients may present with clinical features of APS but with temporary positive or persistently negative titers of aPL. For these patients, the definition of seronegative APS (SN-APS) has been proposed. Nevertheless, the negativity to classic aPL criteria does not imply that other antibodies may be present or involved in the onset of thrombosis. The diagnosis of SN-APS is usually made by exclusion, but its recognition is important to adopt the most appropriate anti-thrombotic strategy to reduce the rate of recurrences. This research is in continuous development as the clinical relevance of these antibodies is far from being completely clarified. The most studied antibodies are those against phosphatidylethanolamine, phosphatidic acid, phosphatidylserine, phosphatidylinositol, vimentin/cardiolipin complex, and annexin A5. Moreover, the assays to measure the levels of these antibodies have not yet been standardized. In this review, we will summarize the evidence on the most studied non-criteria aPL, their potential clinical relevance, and the antithrombotic therapeutic strategies available in the setting of APS and SN-APS.
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Affiliation(s)
- Pasquale Pignatelli
- I Clinica Medica, Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome.,Mediterranea Cardiocentro, Naples
| | - Evaristo Ettorre
- Department of Cardiovascular, Respiratory, Nephrologic, Anesthesiologic and Geriatric Sciences, Division of Gerontology, Sapienza University, Rome
| | - Danilo Menichelli
- I Clinica Medica, Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome
| | - Arianna Pani
- Department of Oncology and Onco-Hematology, University of Milan, Milan.,Clinical Pharmacology Unit, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Francesco Violi
- I Clinica Medica, Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome.,Mediterranea Cardiocentro, Naples
| | - Daniele Pastori
- I Clinica Medica, Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome
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23
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Sciascia S, Willis R, Pengo V, Krilis S, Andrade D, Tektonidou MG, Ugarte A, Chighizola C, Branch DW, Levy RA, Nalli C, Fortin PR, Petri M, Rodriguez E, Rodriguez-Pinto I, Atsumi T, Nascimento I, Rosa R, Banzato A, Erkan D, Cohen H, Efthymiou M, Mackie I, Bertolaccini ML. The comparison of real world and core laboratory antiphospholipid antibody ELISA results from antiphospholipid syndrome alliance for clinical trials & international networking (APS ACTION) clinical database and repository analysis. Thromb Res 2019; 175:32-36. [PMID: 30685523 DOI: 10.1016/j.thromres.2019.01.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 01/08/2019] [Accepted: 01/16/2019] [Indexed: 10/27/2022]
Abstract
BACKGROUND The APS ACTION International Clinical Database and Repository includes a secure web-based data capture system storing patient information including demographics, antiphospholipid antibodies (aPL)-related medical history, and aPL tests. Despite efforts at harmonization, inter-assay variability remains a problem in aPL testing. As a clinical repository open to researchers, ensuring comparability between assays and consistency in results between APS ACTION laboratories is essential to the validity of studies emerging from this network. OBJECTIVE To assess the level of agreement between an aPL-registry inclusion and core laboratory (core lab) anticardiolipin antibody (aCL) and anti-β2-glycoprotein-I antibody (aβ2GPI) ELISA testing results. METHODS Patients are recruited from 25 international centers based on positive aPL tests at inclusion. All samples are retested at the corresponding national APS ACTION core lab to confirm aPL positivity based on standard validated protocols. We analysed the categorical agreement, degree of linear association, and correlation between inclusion (local laboratory) and core lab aPL tests. Samples were included in this study only if results of aPL testing with ELISA at baseline were available. RESULTS 497 registry samples underwent confirmatory aPL tests. Categorical agreement between the inclusion and core lab values, as expressed by Cohen's kappa coefficients, ranged between 0.61 and 0.80 (as substantial agreement). The correlation between quantitative results in the aCL and aβ2GPI was better for IgM and IgA compared to IgG (Spearman rho 0.789 and 0.666 vs. 0.600 for aCL and rho 0.892 and 0.744 vs. 0.432 for aβ2GPI). CONCLUSIONS The results of inclusion for aCL and aβ2GPI tests used for recruitment into the registry were in agreement to the results obtained by the APS ACTION core laboratories; aCL and aβ2GPI results showed very good categorical agreement. This agreement increased when considering high titer (>40 units) samples. APS ACTION is a reliable and useful research resource for APS.
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Affiliation(s)
- Savino Sciascia
- Center of Research of Immunopathology and Rare Diseases, University of Turin, Italy.
| | - Rohan Willis
- Antiphospholipid Standardization Laboratory, Department of Internal Medicine, Rheumatology Division, University of Texas Medical Branch, Galveston, TX, USA
| | - Vittorio Pengo
- Clinical Cardiology, Thrombosis Center, Department of Cardiac Thoracic and Vascular Sciences, University of Padua, Padua, Italy
| | - Steve Krilis
- Department of Infectious Diseases, Immunology and Sexual Health, St George Hospital, Sydney, Australia
| | - Danieli Andrade
- Division of Rheumatology, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | | | | | | | - D Ware Branch
- University of Utah and Intermountain Healthcare, Salt Lake City, UT, USA
| | - Roger A Levy
- State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Cecilia Nalli
- Department of Clinical and Experimental Science, University of Brescia, Brescia, Italy
| | | | | | | | - Ignasi Rodriguez-Pinto
- Department of Autoimmune Diseases, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Catalonia, Spain
| | | | - Iana Nascimento
- Division of Rheumatology, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Renata Rosa
- Division of Rheumatology, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Alessandra Banzato
- Clinical Cardiology, Thrombosis Center, Department of Cardiac Thoracic and Vascular Sciences, University of Padua, Padua, Italy
| | - Doruk Erkan
- Barbara Volcker Center for Women and Rheumatic Diseases, Hospital for Special Surgery, Weill Cornell Medicine, New York, NY, USA
| | - Hannah Cohen
- Haemostasis Research Unit, Department of Haematology, University College London, London, UK; Department of Haematology, University College London Hospitals NHS Foundation Trust, London, UK
| | - Maria Efthymiou
- Haemostasis Research Unit, Department of Haematology, University College London, London, UK
| | - Ian Mackie
- Haemostasis Research Unit, Department of Haematology, University College London, London, UK
| | - Maria Laura Bertolaccini
- Academic Department of Vascular Surgery, Cardiovascular School of Medicine & Sciences, King's College London, UK
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Frodlund M, Vikerfors A, Grosso G, Skogh T, Wetterö J, Elvin K, Gunnarsson I, Kastbom A, Dahlström Ö, Rönnelid J, Svenungsson E, Sjöwall C. Immunoglobulin A anti-phospholipid antibodies in Swedish cases of systemic lupus erythematosus: associations with disease phenotypes, vascular events and damage accrual. Clin Exp Immunol 2018; 194:27-38. [PMID: 30208508 DOI: 10.1111/cei.13180] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/17/2018] [Indexed: 12/19/2022] Open
Abstract
Immunoglobulin (Ig) G- and IgM-class anti-cardiolipin antibodies (aCL) and lupus anti-coagulant (LA) are included in the 1997 update of the American College of Rheumatology (ACR-97) systemic lupus erythematosus (SLE) criteria. Despite limited evidence, IgA-aCL and IgA anti-β2 -glycoprotein-I (anti-β2 GPI) were included in the 2012 Systemic Lupus International Collaborating Clinics criteria. The present study aimed to evaluate IgG-/IgA-/IgM-aCL and anti-β2 GPI occurrence in relation to disease phenotype, smoking habits, pharmacotherapy, anti-phospholipid syndrome (APS) and organ damage among 526 Swedish SLE patients meeting ACR-97. Patients with rheumatoid arthritis (n = 100), primary Sjögren's syndrome (n = 50) and blood donors (n = 507) served as controls. Anti-phospholipid antibodies (aPL) were analysed by fluoroenzyme-immunoassays detecting aCL/anti-β2 GPI. Seventy-six (14%) SLE cases fulfilled the Sydney APS-criteria, and ≥ 1 aCL/anti-β2 GPI isotype (IgG/IgA/IgM) occurred in 138 SLE patients (26%). Forty-five (9%) of the SLE cases had IgA-aCL, 20 of whom (4%) lacked IgG-/IgM-aCL. Seventy-four (14%) tested positive for IgA anti-β2 GPI, 34 (6%) being seronegative regarding IgG/IgM anti-β2 GPI. Six (1%) had APS manifestations but were seropositive regarding IgA-aCL and/or IgA anti-β2 GPI in the absence of IgG/IgM-aPL and LA. Positive LA and IgG-aPL tests were associated with most APS-related events and organ damage. Exclusive IgA anti-β2 GPI occurrence associated inversely with Caucasian ethnicity [odds ratio (OR) = 0·21, 95% confidence interval (CI) = 0·06-0·72) and photosensitivity (OR = 0·19, 95% CI = 0·05-0·72). Nephritis, smoking, LA-positivity and statin/corticosteroid-medication associated strongly with organ damage, whereas hydroxychloroquine-medication was protective. In conclusion, IgA-aPL is not rare in SLE (16%) and IgA-aPL analysis may have additional value among SLE cases with suspected APS testing negative for other isotypes of aPL and LA.
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Affiliation(s)
- M Frodlund
- Division of Neuro and Inflammation Sciences, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - A Vikerfors
- Unit of Rheumatology, Department of Medicine Solna, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - G Grosso
- Unit of Rheumatology, Department of Medicine Solna, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - T Skogh
- Division of Neuro and Inflammation Sciences, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - J Wetterö
- Division of Neuro and Inflammation Sciences, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - K Elvin
- Unit of Clinical Immunology, Department of Clinical Immunology and Transfusion Medicine, Karolinska Institutet, Stockholm, Sweden
| | - I Gunnarsson
- Unit of Rheumatology, Department of Medicine Solna, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - A Kastbom
- Division of Neuro and Inflammation Sciences, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Ö Dahlström
- Swedish Institute for Disability Research, Department of Behavioural Sciences and Learning, Linköping University, Linköping, Sweden
| | - J Rönnelid
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - E Svenungsson
- Unit of Rheumatology, Department of Medicine Solna, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - C Sjöwall
- Division of Neuro and Inflammation Sciences, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
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Added value of non-criteria antiphospholipid antibodies for antiphospholipid syndrome: lessons learned from year-long routine measurements. Clin Rheumatol 2018; 38:371-378. [PMID: 30099654 DOI: 10.1007/s10067-018-4251-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 07/30/2018] [Indexed: 12/17/2022]
Abstract
The international classification criteria for definite antiphospholipid syndrome (APS) include three laboratory measurements: lupus anticoagulant (LA), IgG and IgM isotypes of anti-cardiolipin (aCL) and anti-β2glycoprotein I antibodies (anti-β2GPI). When persistently elevated, they are specific for APS; however, many patients that fulfil clinical criteria may exhibit negative serological results. These "seronegative" APS (SN-APS) are exposed to an increased thrombotic risk. The aims of our cross-sectional, retrospective study of consecutive autoimmune patients' samples were to evaluate the association of non-criteria antiphospholipid antibodies (aPL) with thrombosis and obstetric events, to calculate the risk score for adverse events and to assess the specific contribution of single aPL positivity in SN-APS. LA, aCL, anti-β2GPI and anti-phosphatidylserine/prothrombin antibodies (aPS/PT) of IgG, IgM, and IgA isotypes were determined in sera of 323 patients with autoimmune disorders. Medical records of all patients were carefully analyzed. aCL, anti-β2GPI and aPS/PT of IgG and IgA isotypes were significantly associated with thrombosis while none of the IgM aPL showed such association. aPS/PT of all isotypes, aCL and anti-β2GPI of IgG and IgA isotype showed significant correlation to obstetric events. When considering results of aPS/PT ELISA, we could additionally identify 3% of thrombotic patients and 2% of obstetric patients. Thrombotic and obstetric risk scores were calculated showing significantly higher association to clinical events, as compared to evaluating individual risk factors. aPS/PT could represent an additional biomarker in SN-APS patients. IgA aPL are associated with thrombosis and obstetric complications. Risk scores accounting different aPL and conventional risk factors, better assesses risk for adverse event, as compared to evaluating individual factors alone.
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Vlagea A, Pascual-Salcedo D, Álvarez Doforno R, Lavilla P, Diez J, Padilla Merlano B, Cuesta MV, Gil A. IgA anti-β2 glycoprotein I antibodies: Experience from a large center. Thromb Res 2017; 162:38-43. [PMID: 29274563 DOI: 10.1016/j.thromres.2017.12.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Revised: 11/16/2017] [Accepted: 12/11/2017] [Indexed: 02/06/2023]
Abstract
OBJECTIVE IgG and IgM antibodies directed at β2-glycoprotein I are included in the classification criteria for the antiphospholipid syndrome (APS) while the IgA antibodies against β2-glycoprotein I (IgA aβ2GPI) are not. Conflicting data about the significance of IgA aβ2GPI and APS manifestation can be found and more studies are necessary in order to define the diagnostic value of IgA aβ2GPI. In the present article, we investigated the possible role of IgA aβ2GPI as marker of APS. METHODS A cohort of 314 patients with APS and systemic autoimmune disease was investigated for the presence of IgA aβ2GPI and its association with clinical manifestation of APS. RESULTS Eighty-nine patients presented IgA aβ2GPI, 68 cases associated with others antiphospholipid antibodies (aPL) and in 21 cases being the only aPL present. In primary APS IgA aβ2GPI are highly coincidental with other aPL (92,2%) while most of the isolated IgA aβ2GPI were present in the SLE group (16/21). No association between IgA aβ2GPI and APS manifestations: thrombosis and pregnancy morbidity was found, while a positive association between IgA aβ2GPI and the presence of anti-nDNA, anti-RNP, anti-Sm, anti-SSA, anti-SSB antibodies was encountered. CONCLUSION Our study does not show association between IgA aβ2GPI and APS manifestations and does not support the inclusion of IgA aβ2GPI as a classification criteria for APS.
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Affiliation(s)
- Alexandru Vlagea
- Immunology Department, Hospital Clinic, Barcelona, Spain; Immunology Department, Hospital La Paz, Madrid, Spain.
| | | | | | - Paz Lavilla
- Internal Medicine Department, Hospital La Paz, Madrid, Spain
| | - Jesús Diez
- Department of Biostatistics in Medicine, Hospital La Paz, Madrid, Spain
| | | | | | - Antonio Gil
- Internal Medicine Department, Hospital La Paz, Madrid, Spain
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27
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Primary thromboprophylaxis with low-dose aspirin and antiphospholipid antibodies: Pro's and Con's. Autoimmun Rev 2017; 16:1103-1108. [PMID: 28911988 DOI: 10.1016/j.autrev.2017.09.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 07/19/2017] [Indexed: 11/22/2022]
Abstract
Whether primary prophylaxis should be prescribed in individuals with antiphospholipid antibodies (aPL) remains controversial due to the lack of relevant evidence-based data. Indeed, it is unclear whether the benefit of LDA outweighs the risk of major bleeding associated with LDA in a low-risk population. On the contrary, stratification of aPL-positive subjects according to their aPL profile (combination, isotype and titer), presence of other concomitant risk factors for thrombosis and coexistence of an underling autoimmune disease is essential to decide whether primary prophylactic therapy should be prescribed. Additionally, the management of modifiable thrombotic risk factors is a necessary strategy, and the use of transient prophylaxis is crucial during high-risk periods. Specifically designed prospective trials are urgently needed to determine the real prophylactic impact of aspirin, as well as of alternative or concomitant therapeutic strategies such as hydroxychloroquine, statins or DOACS in aPL positive patients.
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28
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Can we withdraw anticoagulation in patients with antiphospholipid syndrome after seroconvertion? Autoimmun Rev 2017; 16:1109-1114. [PMID: 28899804 DOI: 10.1016/j.autrev.2017.09.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Accepted: 07/27/2017] [Indexed: 02/02/2023]
Abstract
The current mainstay of treatment in patients with thrombotic antiphospholipid syndrome (APS) is long-term anticoagulation, mainly with Vitamin K antagonist agents. Some recently available studies have created new ground for discussion about the possible discontinuation of anticoagulation therapy in patients with a history of thrombotic APS in whom antiphospholipid antibodies (aPL) are not detected any longer (i.e. aPL seroconversion). We report the main points discussed at the last CORA Meeting regarding the issue whether or not anticoagulation can be stopped after aPL seroconversion. In particular, we systematically reviewed the available evidence investigating the clinical outcome of APS patients with aPL seroconversion in whom anticoagulation was stopped when compared to those in whom therapy was continued regardless the aPL profile. Furthermore, the molecular basis for the aPL pathogenicity, the available evidence of non-criteria aPL and their association with thrombosis are addressed. To date, available evidence is still limited to support the indication to stop oral anticoagulation therapy in patients with a previous diagnosis of thrombotic APS who subsequently developed a negative aPL profile. The identification of the whole risk profile for cardiovascular manifestations and possibly of a second level aPL testing in selected patients with aPL might support the eventual clinical decision but further investigation is warranted.
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Sciascia S, Amigo MC, Roccatello D, Khamashta M. Diagnosing antiphospholipid syndrome: 'extra-criteria' manifestations and technical advances. Nat Rev Rheumatol 2017; 13:548-560. [PMID: 28769114 DOI: 10.1038/nrrheum.2017.124] [Citation(s) in RCA: 126] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
First described in the early 1980s, antiphospholipid syndrome (APS) is a unique form of acquired autoimmune thrombophilia in which patients present with clinical features of recurrent thrombosis and pregnancy morbidity and persistently test positive for the presence of antiphospholipid antibodies (aPL). At least one clinical (vascular thrombosis or pregnancy morbidity) and one lab-based (positive test result for lupus anticoagulant, anticardiolipin antibodies and/or anti-β2-glycoprotein 1 antibodies) criterion have to be met for a patient to be classified as having APS. However, the clinical spectrum of APS encompasses additional manifestations that can affect many organs and cannot be explained exclusively by patients being in a prothrombotic state; clinical manifestations not listed in the classification criteria (known as extra-criteria manifestations) include neurologic manifestations (chorea, myelitis and migraine), haematologic manifestations (thrombocytopenia and haemolytic anaemia), livedo reticularis, nephropathy and valvular heart disease. Increasingly, research interest has focused on the development of novel assays that might be more specific for APS than the current aPL tests. This Review focuses on the current classification criteria for APS, presenting the role of extra-criteria manifestations and lab-based tests. Diagnostic approaches to difficult cases, including so-called seronegative APS, are also discussed.
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Affiliation(s)
- Savino Sciascia
- Centre of Research of Immunopathology and Rare Diseases (CMID), Coordinating Centre of Piedmont and Aosta Valley Network for Rare Diseases, Department of Clinical and Biological Sciences, St Giovanni Bosco Hospital and the University of Turin, Piazza del Donatore di Sangue 3, 10154 Turin, Italy.,SCDU Nephrology and Dialysis, Department of Clinical and Biological Sciences, St Giovanni Bosco Hospital and the University of Turin, Piazza del Donatore di Sangue 3, 10154 Turin, Italy
| | - Mary-Carmen Amigo
- Service of Rheumatology, ABC Medical Center, Sur 136 No. 116, Colonia Las Américas, Mexico City 01220, Mexico
| | - Dario Roccatello
- Centre of Research of Immunopathology and Rare Diseases (CMID), Coordinating Centre of Piedmont and Aosta Valley Network for Rare Diseases, Department of Clinical and Biological Sciences, St Giovanni Bosco Hospital and the University of Turin, Piazza del Donatore di Sangue 3, 10154 Turin, Italy.,SCDU Nephrology and Dialysis, Department of Clinical and Biological Sciences, St Giovanni Bosco Hospital and the University of Turin, Piazza del Donatore di Sangue 3, 10154 Turin, Italy
| | - Munther Khamashta
- Department of Rheumatology, Dubai Hospital, PO box 7272, Dubai, UAE.,Graham Hughes Lupus Research Laboratory, Division of Women's Health, King's College London, The Rayne Institute, 4th Floor Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
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Tortosa C, Cabrera-Marante O, Serrano M, Martínez-Flores JA, Pérez D, Lora D, Morillas L, Paz-Artal E, Morales JM, Pleguezuelo D, Serrano A. Incidence of thromboembolic events in asymptomatic carriers of IgA anti ß2 glycoprotein-I antibodies. PLoS One 2017; 12:e0178889. [PMID: 28727732 PMCID: PMC5519006 DOI: 10.1371/journal.pone.0178889] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 05/19/2017] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND The antiphospholipid syndrome (APS) is defined by simultaneous presence of vascular clinical events and antiphospholipid antibodies (aPL). The aPL considered as diagnostics are lupus anticoagulant and antibodies anticardiolipin (aCL) and anti-ß2 glycoprotein-I (aB2GP1). During recent years, IgA aB2GP1 antibodies have been associated with thrombotic events both in patients positive, and mainly negative for other aPL, however its value as a pro-thrombotic risk-factor in asymptomatic patients has not been well defined. OBJECTIVE To test the role of IgA anti B2GP1 as a risk factor for the development of APS-events (thrombosis or pregnancy morbidity) in asymptomatic population with a 5-year follow-up. METHODS 244 patients isolated positive for anti-beta2-glycoprotein I IgA (Group-1 study) and 221 negative patients (Group-2 control) were studied. All the patients were negative for IgG and IgM aCL. RESULTS During the follow-up, 45 patients (9.7%) had APS-events, 38 positive for IgA-aB2GP1 and 7 negative (15.6% vs 3.2%, p<0.001). The incidence rate of APS-events was 3.1% per year in IgA-aB2GP1 positive patients and 0.6% per year in the control group. Arterial thrombosis were the most frequent APS-events (N = 25, 55%) and were mainly observed in Group-1 patients (21 vs 4, p = 0.001). Multivariate analysis were shown as independent risk-factors for the development of APS-events, age, sex (men) and presence of IgA-aB2GP1 (odds ratio 5.25, 95% CI 2.24 to 12.32). CONCLUSION The presence of IgA-aB2GP1 in people with no history of APS-events is the main independent risk factor for the development of these types of events, mainly arterial thrombosis.
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Affiliation(s)
- Carlos Tortosa
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Oscar Cabrera-Marante
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Manuel Serrano
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - José A. Martínez-Flores
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Dolores Pérez
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - David Lora
- Department of Epidemiology, Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Luis Morillas
- Department of Rheumatology, Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Estela Paz-Artal
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - José M. Morales
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Daniel Pleguezuelo
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Antonio Serrano
- Department of Immunology Instituto de Investigación, Hospital Universitario 12 de Octubre, Madrid, Spain
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Oku K, Amengual O, Kato M, Bohgaki T, Horita T, Yasuda S, Sakamoto N, Ieko M, Norman GL, Atsumi T. Significance of fully automated tests for the diagnosis of antiphospholipid syndrome. Thromb Res 2016; 146:1-6. [PMID: 27552227 DOI: 10.1016/j.thromres.2016.08.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 07/21/2016] [Accepted: 08/16/2016] [Indexed: 10/21/2022]
Abstract
Antiphospholipid antibodies (aPLs) can vary both immunologically and functionally, thus it is important to effectively and correctly identify their presence when diagnosing antiphospholipid syndrome. Furthermore, since many immunological/functional tests are necessary to measure aPLs, complete examinations are often not performed in many cases due to significant burden on the testing departments. To address this issue, we measured aPLs defined according to the classification criteria (anticardiolipin antibody: aCL) IgG/IgM and anti-β2 glycoprotein I antibody (aβ2GPI) (IgG/IgM) as well as non-criteria antibodies (aCL IgA, aβ2GPI IgA and aβ2GPI domain I), in a cohort of 211 patients (61 APS, 140 disease controls and 10 healthy individuals). APLs were measured using a fully automated chemiluminescent immunoassay instrument (BIO-FLASH®/ACL AcuStar®) and with conventional ELISA tests. We demonstrated that both sensitivity and accuracy of diagnosis of aCL IgG and aβ2GPI IgG were high, in agreement with the past reports. When multiple aPLs were examined, the accuracy of diagnosis increased. The proportion of APS patients that were positive for 2 or more types of aPLs (47/61, 77%) was higher than that of patients with systemic lupus erythematosus (SLE)(3/37, 9%), those with non-SLE connective tissues diseases (1/53,2%), those with other diseases or healthy volunteers. Based on these findings, it was concluded that the fully automated chemiluminescent immunoassay instrument, which allows the simultaneous evaluation of many types of aPLs, offers clear advantages for a more complete, more rapid and less labor-intensive alternative to running multiple ELISA and could help in better diagnosis for suspected APS patients.
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Affiliation(s)
- Kenji Oku
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
| | - Olga Amengual
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masaru Kato
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Toshiyuki Bohgaki
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Tetsuya Horita
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Shinsuke Yasuda
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Naoya Sakamoto
- Department of Gastroenterology and Hepatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masahiro Ieko
- Department of Internal Medicine, Health Science University of Hokkaido, To-betsu Cho, Japan
| | | | - Tatsuya Atsumi
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
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Pérez D, Martínez-Flores JA, Serrano M, Lora D, Paz-Artal E, Morales JM, Serrano A. Evaluation of three fully automated immunoassay systems for detection of IgA anti-beta 2-glycoprotein I antibodies. Int J Lab Hematol 2016; 38:560-8. [PMID: 27435259 DOI: 10.1111/ijlh.12543] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 04/20/2016] [Indexed: 11/26/2022]
Abstract
INTRODUCTION In recent years, we have been witnessing increased clinical interest in the determination of IgA anti-beta 2-glycoprotein I (aB2GPI) antibodies as well as increased demand for this test. Some ELISA-based diagnostic systems for IgA aB2GPI antibodies detection are suboptimal to detect it. The aim of our study was to determine whether the diagnostic yield of modern detection systems based on automatic platforms to measure IgA aB2GPI is equivalent to that of the well-optimized ELISA-based assays. METHODS In total, 130 patients were analyzed for IgA aB2GPI by three fully automated immunoassays using an ELISA-based assay as reference. The three systems were also analyzed for IgG aB2GPI with 58 patients. RESULTS System 1 was able to detect IgA aB2GPI with good sensitivity and kappa index (99% and 0.72, respectively). The other two systems had also poor sensitivity (20% and 15%) and kappa index (0.10 and 0.07), respectively. On the other hand, kappa index for IgG aB2GPI was >0.89 in the three systems. CONCLUSION Some analytical methods to detect IgA aB2GPI are suboptimal as well as some ELISA-based diagnostic systems. It is important that the scientific community work to standardize analytical methods to determine IgA aB2GPI antibodies.
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Affiliation(s)
- D Pérez
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain.
| | - J A Martínez-Flores
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - M Serrano
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - D Lora
- Epidemiology Section, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - E Paz-Artal
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain.,Immunology Section, Universidad San Pablo-CEU, Madrid, Spain
| | - J M Morales
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - A Serrano
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain.,Immunology Section, Universidad San Pablo-CEU, Madrid, Spain
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Thrombotic risk assessment in antiphospholipid syndrome: the role of new antibody specificities and thrombin generation assay. Clin Mol Allergy 2016; 14:6. [PMID: 27429595 PMCID: PMC4947367 DOI: 10.1186/s12948-016-0043-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 07/07/2016] [Indexed: 11/28/2022] Open
Abstract
Antiphospholipid syndrome (APS) is an autoimmune condition characterized by the presence of antiphospholipid antibodies (aPL) in subjects presenting with thrombosis and/or pregnancy loss. The currently used classification criteria were updated in the international consensus held in Sidney in 2005. Vascular events seem to result of local procoagulative alterations upon triggers influence (the so called “second-hit theory”), while placental thrombosis and complement activation seem to lead to pregnancy morbidity. The laboratory tests suggested by the current classification criteria include lupus anticoagulant, a functional coagulation assay, and anticardiolipin and anti-β2-glycoprotein-I antibodies, generally detected by solid phase enzyme-linked immunosorbent assay. The real challenge for treating physicians is understanding what is the actual weight of aPL in provoking clinical manifestations in each case. As thrombosis has a multi-factorial cause, each patient needs a risk-stratified approach. In this review we discuss the role of thrombotic risk assessment in primary and secondary prevention of venous and arterial thromboembolic disease in patients with APS, focusing on new antibody specificities, available risk scoring models and new coagulation assays.
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Antiphospholipid Syndrome and Kidney Involvement: New Insights. Antibodies (Basel) 2016; 5:antib5030017. [PMID: 31557998 PMCID: PMC6698833 DOI: 10.3390/antib5030017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/01/2016] [Accepted: 07/01/2016] [Indexed: 11/17/2022] Open
Abstract
Antiphospholipid syndrome is an autoimmune disorder characterized by vascular thromboses and pregnancy morbidity associated with antiphospholipid antibodies: lupus anticoagulant, IgG or IgM anticardiolipin or anti-beta 2-glycoprotein I. The kidney is one of the major target organs in antiphospholipid syndrome (APS). However, beyond the known involvement of the kidney in primary and associated APS, we may be observing a new form of APS within the context of renal failure. This review describes the classical kidney manifestations of APS and provides new considerations to be taken into account.
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Brusch A. The Significance of Anti-Beta-2-Glycoprotein I Antibodies in Antiphospholipid Syndrome. Antibodies (Basel) 2016; 5:antib5020016. [PMID: 31557997 PMCID: PMC6698844 DOI: 10.3390/antib5020016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 05/24/2016] [Accepted: 06/03/2016] [Indexed: 01/26/2023] Open
Abstract
Antiphospholipid syndrome (APS) is a thrombophilic disorder that classically presents with vascular thrombosis and/or obstetric complications. APS is associated with antiphospholipid antibodies: a heterogeneous group of autoantibodies that are directed against membrane phospholipids in complex with phospholipid-binding proteins. Beta-2-glycoprotein I (B2GPI) binds anionic phospholipids and is considered to be the predominant antigen in APS and antibodies against B2GPI (anti-B2GPI) are recognised in the laboratory criteria for APS diagnosis. This review focuses on the part played by anti-B2GPI in the pathogenesis of APS, their associations with different clinical phenotypes of the disorder and new avenues for refining the diagnostic potential of anti-B2GPI testing.
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Affiliation(s)
- Anna Brusch
- Department of Clinical Immunology, PathWest, Sir Charles Gairdner Hospital, Perth WA 6009, Australia.
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Al Marzooqi A, Leone A, Al Saleh J, Khamashta M. Current status and future prospects for the treatment of antiphospholipid syndrome. Expert Rev Clin Immunol 2016; 12:927-35. [PMID: 27117597 DOI: 10.1080/1744666x.2016.1178573] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Antiphospholipid syndrome (APS) is a prothrombotic disease characterized by thrombosis and pregnancy morbidity in the presence of antiphospholipid antibodies (apL). Management of thrombosis is based on long-term oral anticoagulation and patients with arterial events should be treated aggressively. Primary thrombo-prophylaxis is recommended in patients with systemic lupus erythromatosus (SLE) and obstetric APS. Obstetric APS care is based on high-risk management and treatment with aspirin and heparin. Possible future therapies include statins, hydroxychloroquine, rituximab, and new anticoagulant drugs. Current research is focused on targeting components of the complement system, interfering with aPL-mediated cell activation and using tailored peptides to block the pathogenic subpopulation of aPL.
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Affiliation(s)
| | - Alessia Leone
- b School of Medicine , University of Birmingham , Birmingham , UK
| | - Jamal Al Saleh
- a Rheumatology Department , Dubai Hospital , Dubai , UAE
| | - Munther Khamashta
- a Rheumatology Department , Dubai Hospital , Dubai , UAE.,c Lupus Research Unit, The Rayne Institute, Division of Women's Health , St Thomas' Hospital , London , UK
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Khamashta M, Taraborelli M, Sciascia S, Tincani A. Antiphospholipid syndrome. Best Pract Res Clin Rheumatol 2016; 30:133-48. [DOI: 10.1016/j.berh.2016.04.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
The peer-reviewed publications in the field of autoimmunity published in 2013 represented a significant proportion of immunology articles and grew since the previous year to indicate that more immune-mediated phenomena may recognize an autoimmune mechanism and illustrated by osteoarthritis and atherosclerosis. As a result, our understanding of the mechanisms of autoimmunity is becoming the paradigm for translational research in which the progress in disease pathogenesis for both tolerance breakdown and inflammation perpetuation is rapidly followed by new treatment approaches and clinical management changes. The similarities across the autoimmune disease spectrum outnumber differences, particularly when treatments are compared. Indeed, the therapeutics of autoimmune diseases are based on a growing armamentarium that currently includes monoclonal antibodies and small molecules which act by targeting molecular markers or intracellular mediators with high specificity. Among the over 100 conditions considered as autoimmune, the common grounds are well illustrated by the data reported for systemic lupus erythematosus and rheumatoid arthritis or by the plethora of studies on Th17 cells and biomarkers, particularly serum autoantibodies. Further, we are particularly intrigued by studies on the genomics, epigenetics, and microRNA at different stages of disease development or on the safe and effective use of abatacept acting on the costimulation of T and B cells in rheumatoid arthritis. We are convinced that the data published in 2013 represent a promising background for future developments that will exponentially impact the work of laboratory and clinical scientists over the next years.
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Hood DB, Snyder KR, Buckner TR, Hurley BL, Pitts KR, Lopez LR. Differential assay reactivity of immunglobulin A anti-ß 2 glycoprotein I antibodies: implications for the clinical interpretation of antiphospholipid antibody testing. Eur J Rheumatol 2015; 2:135-138. [PMID: 27708950 DOI: 10.5152/eurjrheum.2015.0012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 04/17/2015] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE The routine measurement of IgA anticardiolipin (aCL) and IgA anti-β2 glycoprotein I (anti-β2 GPI) antibodies remain controversial despite several studies demonstrating an association with thromboembolic disease in patients with systemic lupus erythematosus (SLE) and antiphospholipid syndrome (APS). This controversy may be a contributing factor for the current under use of IgA antiphospholipid antibodies. We aimed to investigate the nature of discrepant IgA anti-β2 GPI reactivity to help define the diagnostic value of IgA antiphospholipid antibodies. MATERIAL AND METHODS Four sera selected from SLE/APS patients and positive for antiphospholipid antibodies but having discrepant IgA anti-β2 GPI reactivity on two commercial assays were studied. IgA antibodies were affinity purified to investigate anti-β2 GPI reactivity. Column wash through and eluent fractions were tested on both IgA anti-β2 GPI assays. Results were normalized to total protein. Assay conjugates and standards from the discrepant assays were interchanged. RESULTS The diseased samples were strongly positive in one assay [144-388 IgA antiphospholipid (APL) units] and negative or weakly positive in another assay (9.9-53 APL units). IgA eluents from IgA anti-β2 GPI positive samples reacted 10 times stronger on the reactive assay. When normalized to protein content, the eluents showed no cross-reactivity for IgG or IgM anti-β2 GPI antibodies, confirming IgA isotype specificity. Conjugate interchange confirmed that both assays bound IgA anti-β2 GPI antibodies, but the anti-IgA conjugate from the reactive assay was 4 times stronger, suggesting that its ability to detect IgA anti-β2 GPI antibodies was partially dependent on the anti-IgA conjugate and calibration. CONCLUSION These results confirm not only the presence of IgA anti-β2 GPI antibodies in the selected patient samples but also highlight an IgA conjugate issue for the unreactive assay, causing an underestimation of IgA anti-β2 GPI. This finding may assist in the ongoing standardization efforts of APS antibody testing. In addition, conclusions from published clinical studies may need to be revised as some assays may understate IgA significance.
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Affiliation(s)
- David B Hood
- Corgenix Medical Corporation, Broomfield, Colorado, USA
| | | | | | - Beth L Hurley
- Corgenix Medical Corporation, Broomfield, Colorado, USA
| | - Kelly R Pitts
- Corgenix Medical Corporation, Broomfield, Colorado, USA
| | - Luis R Lopez
- Corgenix Medical Corporation, Broomfield, Colorado, USA
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Mattia E, Ruffatti A, Tonello M, Meneghel L, Robecchi B, Pittoni M, Gallo N, Salvan E, Teghil V, Punzi L, Plebani M. IgA anticardiolipin and IgA anti-β2 glycoprotein I antibody positivity determined by fluorescence enzyme immunoassay in primary antiphospholipid syndrome. Clin Chem Lab Med 2015; 52:1329-33. [PMID: 24651022 DOI: 10.1515/cclm-2014-0039] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 02/28/2014] [Indexed: 12/14/2022]
Abstract
BACKGROUND Primary antiphospholipid syndrome (PAPS) is an autoimmune disease characterized by thrombosis and/or pregnancy morbidity as well as blood antiphospholipid (aPL) antibodies such as anticardiolipin (aCL), anti-β2 glycoprotein I (anti-β2GPI) antibodies of the IgG/IgM isotype and lupus anticoagulant (LA). The clinical significance of aCL and anti-β2GPI antibodies of the IgA isotype in PAPS is still a controversial issue. METHODS Sera and plasma were collected from 84 PAPS patients (54 with thrombosis and/or pregnancy morbidity and 30 with pregnancy morbidity alone), 66 seronegative patients (subjects with clinical manifestations of PAPS although with negative results on conventional antiphospholipid antibody testing), and 78 healthy blood donors. IgA aCL and IgA anti-β2GPI were determined using fluorescence enzyme immunoassay (FEIA), (EliATM, Phadia AB, Uppsala, Sweden). For comparison purposes, the sera were also tested for IgG/IgM aCL/anti-β2GPI antibodies using the same immunoassay method. LA was assayed following internationally accepted guidelines. RESULTS Present respectively in 19% and 50% of the PAPS patients studied, IgA aCL and IgA anti-β2GPI antibody frequencies were both statistically significant (p=0.001 and p<0.001, respectively). The mean titers of both IgA aCL and IgA anti-β2GPI antibodies were higher in the thrombotic patients, but only the latter were significantly associated with thrombosis. Isolated IgA anti-β2GPI antibody positivity was significantly prevalent (p=0.04) in seven (10.6%) of the seronegative patients. CONCLUSIONS Positivity to IgA anti-β2GPI antibody detected using FEIA was found to be clinically relevant in PAPS patients. Moreover the prevalence of isolated IgA anti-β2GPI antibody positivity was significant in the seronegative patients.
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Kraiem I, Hadhri S, Ben Rejeb M, Ifa L, Jmaa A, Ajmi S, Skouri H. Antiphospholipid Antibodies and Procoagulant Profile in Tunisians With Inflammatory Bowel Diseases. Clin Appl Thromb Hemost 2015; 22:734-742. [PMID: 25878173 DOI: 10.1177/1076029615581364] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The hypercoagulable state accompanying inflammatory bowel diseases (IBDs) is still poorly understood. The aim of this study was to assess antiphospholipid antibodies (APAs) and a large panel of inherited and acquired thrombotic markers simultaneously in a sample of Tunisian patients with IBD. In total, 89 consecutive patients with IBD (mean age 38 ± 15 years; 48 with Crohn disease and 41 with ulcerative colitis) and 129 controls were prospectively evaluated for immunoglobulin (Ig) G, IgM, and IgA antibodies against cardiolipin (aCL), β2glycoprotein I (aβ2GPI), and prothrombin (aPT); IgG and IgM antibodies against phosphatidic acid (aPA), phosphatidylinositol (aPI), and annexin V (aAnnV); lupus anticoagulant (LA); coagulation factors; natural inhibitors; and thrombotic genetic polymorphisms. Levels of fibrinogen, factors II, V, and VIII and von Willebrand factor, antithrombin, and protein C were significantly higher in patients with IBD than in controls (P < .05 for all comparisons). At least 1 APA subset was detected in 54 patients. The frequencies of antibodies against anionic phospholipids-aCL, aPI, and aPA-in patients with IBD were 15.9%, 21.3%, and 14.6%, respectively. The frequencies of antiphospholipid cofactor antibodies were 39.8% for aβ2GPI and 15.7% for both aAnnV and aPT. Isolated aβ2GPI IgA was detected in 22 patients, and 12 (13.5%) patients had LA. The IgA aβ2GPI antibodies were frequently detected in Tunisian patients with IBD. These results are of potential diagnostic, prognostic, and therapeutic interest.
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Affiliation(s)
- Imen Kraiem
- Laboratoire d'Hématologie et Banque du Sang, UR12ES05. CHU Sahloul, Sousse, Tunisie
| | - Samira Hadhri
- Laboratoire d'Hématologie et Banque du Sang, UR12ES05. CHU Sahloul, Sousse, Tunisie
| | | | - Lamia Ifa
- Laboratoire d'Hématologie et Banque du Sang, UR12ES05. CHU Sahloul, Sousse, Tunisie
| | - Ali Jmaa
- Service de Gastroentérologie CHU Sahloul, Sousse, Tunisie
| | - Salem Ajmi
- Service de Gastroentérologie CHU Sahloul, Sousse, Tunisie
| | - Hadef Skouri
- Laboratoire d'Hématologie et Banque du Sang, UR12ES05. CHU Sahloul, Sousse, Tunisie
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Martínez-Flores JA, Serrano M, Pérez D, Lora D, Paz-Artal E, Morales JM, Serrano A. Detection of circulating immune complexes of human IgA and beta 2 glycoprotein I in patients with antiphospholipid syndrome symptomatology. J Immunol Methods 2015; 422:51-8. [PMID: 25865263 DOI: 10.1016/j.jim.2015.04.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 03/28/2015] [Accepted: 04/01/2015] [Indexed: 01/01/2023]
Abstract
BACKGROUND Patients with antiphospholipid syndrome (APS) have a hypercoagulable condition associated with the presence of antiphospholipid autoantibodies (aPL). Consensus antibodies for diagnosis are lupus anticoagulant, anti-beta2 glycoprotein I (B2GPI) and anticardiolipin (IgG or IgM). Circulating immunocomplexes (CIC) of B2GPI associated with IgM or IgG were reported. Isolated IgA aB2GPI antibodies have achieved high diagnostic value although specific CIC of B2GPI bounded to IgA (B2A-CIC) has still not been described. CIC detection assays are mainly based on interaction with complement and are not appropriate to detect B2A-CIC because IgA does not fix complement using the classical pathway. PATIENTS AND METHODS Sera from healthy blood donors (N= 247) and from patients with thrombosis background and isolate positive for IgA aB2GPI (N = 68) were studied in a case-control study. Two methods were applied, these being a capture ELISA to quantify specific B2A-CIC and quantification of total IgA anti-B2GPI after dissociating CIC. RESULTS B2A-CIC values in APS-patients were 19.27 ± 2.6 AU vs 6.1 ± 0.4 AU in blood donors (p < 0.001). There were 36.4% B2A-CIC positive patients (cutoff 21 AU) versus 5.5% in blood donors (p < 0.001). Dissociated IgA aB2GPI levels (total IgA aB2GPI) were 146.8 ± 10.8 IU/mL in patients vs. 22.4 IU/mL in controls (p < 0.001). B2A-CIC was independent of B2GPI and autoantibodies IgA aB2GPI serum levels. CONCLUSION B2A-CIC can be identified and quantified in an easy and reproducible manner using two complement-independent methods. The use of these tests in prospective studies will allow better understanding of the prognosis and outcome of patients.
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Affiliation(s)
- José A Martínez-Flores
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Manuel Serrano
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Dolores Pérez
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - David Lora
- Epidemiology Section, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Estela Paz-Artal
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain; Immunology Section, Universidad San Pablo-CEU, Madrid, Spain
| | - José M Morales
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Antonio Serrano
- Department of Immunology, Instituto de Investigación Hospital Universitario 12 de Octubre, Madrid, Spain; Immunology Section, Universidad San Pablo-CEU, Madrid, Spain.
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Abreu MM, Danowski A, Wahl DG, Amigo MC, Tektonidou M, Pacheco MS, Fleming N, Domingues V, Sciascia S, Lyra JO, Petri M, Khamashta M, Levy RA. The relevance of "non-criteria" clinical manifestations of antiphospholipid syndrome: 14th International Congress on Antiphospholipid Antibodies Technical Task Force Report on Antiphospholipid Syndrome Clinical Features. Autoimmun Rev 2015; 14:401-14. [PMID: 25641203 DOI: 10.1016/j.autrev.2015.01.002] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 01/05/2015] [Indexed: 12/21/2022]
Abstract
The purpose of this task force was to critically analyze nine non-criteria manifestations of APS to support their inclusion as APS classification criteria. The Task Force Members selected the non-criteria clinical manifestations according to their clinical relevance, that is, the patient-important outcome from clinician perspective. They included superficial vein thrombosis, thrombocytopenia, renal microangiopathy, heart valve disease, livedo reticularis, migraine, chorea, seizures and myelitis, which were reviewed by this International Task Force collaboration, in addition to the seronegative APS (SN-APS). GRADE system was used to evaluate the quality of evidence of medical literature of each selected item. This critical appraisal exercise aimed to support the debate regarding the clinical picture of APS. We found that the overall GRADE analysis was very low for migraine and seizures, low for superficial venous thrombosis, thrombocytopenia, chorea, longitudinal myelitis and the so-called seronegative APS and moderate for APS nephropathy, heart valve lesions and livedo reticularis. The next step can be a critical redefinition of an APS gold standard, for instance derived from the APS ACTION registry that will include not only current APS patients but also those with antiphospholipid antibodies not meeting current classification criteria.
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Affiliation(s)
- Mirhelen M Abreu
- Disciplina de Reumatologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
| | - Adriana Danowski
- Serviço de Reumatologia, Hospital do Servidor Estadual do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Denis G Wahl
- Vascular Medicine Division and Regional Competence Centre For Rare Vascular and Systemic Autoimmune Diseases, Centre Hospitalier Universitaire (CHU), Nancy, France; Institut Lorrain du Coeur et des Vaisseaux Louis Mathieu, Vandoeuvre-les-Nancy, France; Institut National de la Santé et de la Recherche Médicale (INSERM), U1116, Vandoeuvre-les-Nancy Cedex, France
| | | | - Maria Tektonidou
- First Department of Internal Medicine, University of Athens, Athens, Greece
| | - Marcelo S Pacheco
- Serviço de Reumatologia, Hospital do Servidor Estadual do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Norma Fleming
- Pedro Ernesto University Hospital of the Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Vinicius Domingues
- New York Presbyterian Hospital, Weill Cornell Medical College, New York, NY, USA
| | - Savino Sciascia
- Centro di Ricerche di Immunopatologia e Documentazione su Malattie Rare and Università di Torino, Dipartimento di Scienze Cliniche e Biologiche, Torino, Italy; Graham Hughes Lupus Research Laboratory, King's College London, London, UK
| | - Julia O Lyra
- Rio de Janeiro Municipality, Rio de Janeiro, Brazil
| | - Michelle Petri
- Johns Hopkins University School of Medicine, Baltimore, USA
| | | | - Roger A Levy
- Discipline of Rheumatology, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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Preuss B, Tunaru S, Henes J, Offermanns S, Klein R. A novel luminescence-based method for the detection of functionally active antibodies to muscarinic acetylcholine receptors of the M3 type (mAchR3) in patients' sera. Clin Exp Immunol 2014; 177:179-89. [PMID: 24628494 DOI: 10.1111/cei.12324] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/11/2014] [Indexed: 12/11/2022] Open
Abstract
In different bioassays, functional antibodies reacting with the human muscarinic acetylcholine receptor M3(mAchR3) have been detected in sera from patients with Sjögren's syndrome (SS), and there is strong evidence that those antibodies may have pathogenetic relevance. However, depending on the method of detection, their prevalence varied. Furthermore, those bioassays are difficult to standardize. We report on the development and optimization of a novel test system based on a luminometric method to determine downstream signalling of mAchR3 which produces specific and reproducible results. Chinese hamster ovarian (CHO) cells were transfected with plasmids encoding mAchR3 and a green fluorescence protein (GFP)/aequorin fusion protein. Incubation of cells with carbachol resulted in an increase in intracellular [Ca(2+)], which was detected by measuring light emission with a luminometer, and the effect of incubation with patients' immunoglobulins (Ig) was evaluated. Optimal cell density, Ig preparation and time of incubation with patients' sera were determined. Sera from patients with primary Sjögren's syndrome (pSS; n = 40), systemic sclerosis (SSc; n = 47), myasthenia gravis (MG; n = 133) and 50 blood donors were analysed. Optimal assay conditions were obtained with a cell density of 100 000 cells/ml, isolation of Ig by ammonium sulphate precipitation and short-term incubation. Based on this highly reliable assay, 50% of the pSS patients had antibodies which inhibited carbachol-induced activation of mAchR3; none of the SSc patients, 6% of the patients with MG and 12% of the blood donors had antibodies which reacted with the mAchR3. This method facilitates the determination of functional anti-mAchR3 antibodies in patients' sera, confirmed their high prevalence in pSS patients and may, therefore, help to analyse their pathogenetic and clinical relevance in more detail.
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Affiliation(s)
- B Preuss
- Department of Internal Medicine II, University of Tuebingen, Tuebingen, Germany
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Selmi C. Hot topics in autoimmune diseases: Perspectives from the 2013 Asian Congress of Autoimmunity. Autoimmun Rev 2014; 13:781-7. [DOI: 10.1016/j.autrev.2014.05.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Accepted: 05/05/2014] [Indexed: 12/12/2022]
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Risk of venous and arterial thrombosis according to type of antiphospholipid antibodies in adults without systemic lupus erythematosus: A systematic review and meta-analysis. Autoimmun Rev 2014; 13:595-608. [DOI: 10.1016/j.autrev.2013.11.004] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 11/08/2013] [Indexed: 11/20/2022]
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Sciascia S, Cuadrado MJ, Khamashta M, Roccatello D. Renal involvement in antiphospholipid syndrome. Nat Rev Nephrol 2014; 10:279-89. [PMID: 24642799 DOI: 10.1038/nrneph.2014.38] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Antiphospholipid syndrome (APS) is an autoimmune disease defined by the presence of arterial or venous thrombotic events and/or pregnancy morbidity in patients who test positive for antiphospholipid antibodies (aPLs). APS can be isolated (known as primary APS) or associated with other autoimmune diseases, such as systemic lupus erythematosus (SLE; known as secondary APS). The kidney is a major target organ in APS and renal thrombosis can occur at any level within the vasculature of the kidney (renal arteries, intrarenal arteries, glomerular capillaries and renal veins); events reflect the site and size of the involved vessels. Histological findings vary widely, including ischaemic glomeruli and thrombotic lesions without glomerular or arterial immune deposits on immunofluorescence. Renal prognosis is affected by the presence of aPLs in patients with lupus nephritis and can be poor. In patients with SLE and aPLs, biopsy should be performed because inflammatory and thrombotic lesions require different therapeutic approaches. Renal involvement in patients with definite APS is treated by anticoagulation with long-term warfarin. The range of renal manifestations associated with APS is broadening and, therefore, aPLs have increasing relevance in end-stage renal disease, transplantation and pregnancy.
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Affiliation(s)
- Savino Sciascia
- Centro di Ricerche di Immunopatologia e Documentazione su Malattie Rare and Università di Torino, Piazza del Donatore di Sangue 3, 10154 Turin, Italy
| | - Maria José Cuadrado
- Louise Coote Lupus Unit, Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, King's College London, Westminster Bridge Road, London SE1 7EH, UK
| | - Munther Khamashta
- Graham Hughes Lupus Research Laboratory, The Rayne Institute, Division of Women's Health, King's College London, Westminster Bridge Road, London SE1 7EH, UK
| | - Dario Roccatello
- Centro di Ricerche di Immunopatologia e Documentazione su Malattie Rare and Università di Torino, Piazza del Donatore di Sangue 3, 10154 Turin, Italy
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Autoantibody profiling of patients with antiphospholipid syndrome using an automated multiplexed immunoassay system. Autoimmun Rev 2014; 13:59-63. [DOI: 10.1016/j.autrev.2013.08.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2013] [Accepted: 08/25/2013] [Indexed: 11/17/2022]
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Meroni PL, Chighizola CB, Rovelli F, Gerosa M. Antiphospholipid syndrome in 2014: more clinical manifestations, novel pathogenic players and emerging biomarkers. Arthritis Res Ther 2014; 16:209. [PMID: 25166960 PMCID: PMC4060447 DOI: 10.1186/ar4549] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The clinical spectrum of the anti-phospholipid syndrome (APS) is not limited to vascular thrombosis or miscarriages but includes additional manifestations that cannot be explained solely by a thrombophilic state. Anti-cardiolipin, anti-beta₂ glycoprotein I (anti-β₂GPI) and lupus anticoagulant (LA) assays are not only the formal diagnostic and classification laboratory tools but also parameters to stratify the risk to develop the clinical manifestations of the syndrome. In particular, anti-β₂GPI antibodies reacting with an immunodominant epitope on domain I of the molecule were reported as the prevalent specificity in APS patients, correlating with a more aggressive clinical picture. Several laboratory assays to improve the diagnostic and predictive power of the standard tests have been proposed. Plates coated with the phosphatidylserine-prothrombin complex for detecting antibodies represent a promising laboratory tool correlating with LA and with clinical manifestations. Anti-phospholipid antibodies can be found in patients with full-blown APS, in those with thrombotic events or obstetric complications only or in asymptomatic carriers. An inflammatory second hit is required to increase the presence of β₂GPI in vascular tissues, eventually triggering thrombosis. Post-transcriptional modifications of circulating β₂GPI, different epitope specificities or diverse anti-β₂GPI antibody-induced cell signaling have all been suggested to affect the clinical manifestations and/or to modulate their occurrence.
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Affiliation(s)
- Pier Luigi Meroni
- Division of Rheumatology - Istituto Ortopedico Gaetano Pini, Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy
- Istituto Auxologico Italiano, via Zucchi 18, 20095 Cusano Milanino, Mi, Italy
| | - Cecilia Beatrice Chighizola
- Division of Rheumatology - Istituto Ortopedico Gaetano Pini, Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy
- Istituto Auxologico Italiano, via Zucchi 18, 20095 Cusano Milanino, Mi, Italy
| | - Francesca Rovelli
- Division of Rheumatology - Istituto Ortopedico Gaetano Pini, Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy
| | - Maria Gerosa
- Division of Rheumatology - Istituto Ortopedico Gaetano Pini, Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy
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Clinical significance of IgA anti-cardiolipin and IgA anti-β2glycoprotein I antibodies. Curr Rheumatol Rep 2013; 15:343. [PMID: 23754504 DOI: 10.1007/s11926-013-0343-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
IgA antiphospholipid antibodies (aPL) are not currently recognized as formal laboratory criteria for the Antiphospholipid Syndrome (APS). This is mainly due to methodological issues (different study designs, use of various non-standardized IgA assays). However, there are experimental data showing the pathogenic role of IgA anti-cardiolipin antibodies (aCL) and IgA anti-β2glycoprotein I antibodies (anti-β2GPI). Isolated IgA aCL are not very common, therefore their testing could be useful in the case of strong suspicion of APS but negative results for other aPL tests. IgA anti-β2GPI seem to be the most prevalent isotype in patients with Systemic Lupus Erythematosus (SLE), with a significant association with thrombotic events. Such a clinical relevance has been recently recognized by the inclusion of these autoantibodies among the aPL tests in the novel SLICC classification criteria for SLE. Emerging interest has been raised by IgA anti-β2GPI against domain 4/5 as a novel subgroup of clinically relevant aPL.
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