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Mihaylova G, Vasilev V, Kosturkova M, Petkova M, Radanova M. Anti-factor H autoantibodies in patients with lupus nephritis. Med Clin (Barc) 2024:S0025-7753(24)00388-9. [PMID: 39003116 DOI: 10.1016/j.medcli.2024.05.019] [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: 03/14/2024] [Revised: 05/09/2024] [Accepted: 05/10/2024] [Indexed: 07/15/2024]
Abstract
INTRODUCTION Lupus nephritis (LN) is a disease marked by autoantibodies against complement components. Autoantibodies against negative complement regulator factor H (anti-FH) are prevalent in aHUS, are associated with deletion of factor H-related protein 1 (FHR1) gene, and have overt functional consequences. They are also observed in C3 glomerulopathies. The frequency and relevance of anti-FH in LN are poorly studied. AIM The aim of our investigation was to screen for the presence of anti-FH and FHR1 gene deletion in a cohort of LN patients and to evaluate their association with LN activity. METHOD ELISA test and Western blot for detection of anti-FH and FHR1 deletion were used, respectively. Patients' clinical and laboratory parameters regarding anti-FH role were processed by statistical analysis. RESULTS Anti-FH were found at low level in a small number of LN patients - 11.7% (7/60) and were not associated with deletion of FHR1. Anti-FH did not correlate with ANA titers, anti-dsDNA, C3/C4 hypocomplementemia, eGFR, proteinuria, or active urinary sediment in LN patients. A weak correlation was found between anti-FH and anti-C3 levels. Anti-FH were linked with endocapillary proliferation and histological activity index. Four anti-FH positive patients had severe to moderate LN as per the BILAG renal score. CONCLUSIONS Anti-FH autoantibodies are an accessory finding in LN and are more likely to manifest during the active phase of the disease. Due to their low frequency and plasma levels, they do not seem suitable for routine laboratory investigation in patients with LN.
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Affiliation(s)
- Galya Mihaylova
- Department of Biochemistry, Molecular Medicine and Nutrigenomics, Medical University of Varna, Varna, Bulgaria
| | - Vasil Vasilev
- Department of Nephrology, Medical University of Sofia, Sofia, Bulgaria; Clinic of Nephrology, University Hospital - "Tsaritza Yoanna - ISUL", Sofia, Bulgaria
| | - Mariya Kosturkova
- Department of Propaedeutics of Internal Diseases, Medical University of Varna, Bulgaria; Clinic of Internal Diseases, UMHAT "St. Marina", Varna, Bulgaria
| | - Mariana Petkova
- Department of Nephrology, Medical University of Sofia, Sofia, Bulgaria; Clinic of Nephrology, University Hospital - "Tsaritza Yoanna - ISUL", Sofia, Bulgaria
| | - Maria Radanova
- Department of Biochemistry, Molecular Medicine and Nutrigenomics, Medical University of Varna, Varna, Bulgaria.
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2
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Philip R, Aouba A, Martin Silva N, Mariotte D, Hamidi H, Rhouni S, Darnige L, Dragon-Durey MA. Autoantibodies against complement proteins in patients with antiphospholipid syndrome: Prevalence and clinical associations. Eur J Immunol 2024; 54:e2350832. [PMID: 38700064 DOI: 10.1002/eji.202350832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 04/15/2024] [Accepted: 04/16/2024] [Indexed: 05/05/2024]
Abstract
Seventy-seven patients with antiphospholipid syndrome were tested for autoantibodies against C1q, C3, FB, FH, and C4bp. Fifty-seven patients had at least one anti-complement antibody. IgM anti-FH positivity was associated with thrombosis when anti-C3 and anti-FB were, negatively or positively, associated with various noncriteria manifestations of antiphospholipid syndrome.
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Affiliation(s)
- Rémi Philip
- Department of Clinical Immunology and Internal Medicine, CHU of Caen Normandie, Caen, France
- INSERM UMRS 1138 Team "Inflammation, Complement and Cancer", Centre de Recherche des Cordeliers, Sorbonne Université, Université Paris Cité, Paris, France
- UNICAEN, CHU de Caen Normandie, Normandie University, Caen, France
| | - Achille Aouba
- Department of Clinical Immunology and Internal Medicine, CHU of Caen Normandie, Caen, France
- UNICAEN, CHU de Caen Normandie, Normandie University, Caen, France
| | - Nicolas Martin Silva
- Department of Clinical Immunology and Internal Medicine, CHU of Caen Normandie, Caen, France
| | - Delphine Mariotte
- Laboratory of Immunology and Histocompatibility, Department of Biology, CHU of Caen Normandie, Caen, France
| | - Houcine Hamidi
- INSERM UMRS 1138 Team "Inflammation, Complement and Cancer", Centre de Recherche des Cordeliers, Sorbonne Université, Université Paris Cité, Paris, France
- Laboratory of Immunology, Hôpital Européen Georges-Pompidou, Assistance Publique Hopitaux de Paris (APHP), Paris, France
| | - Sanae Rhouni
- Laboratory of Immunology, Hôpital Européen Georges-Pompidou, Assistance Publique Hopitaux de Paris (APHP), Paris, France
| | - Luc Darnige
- Hematology Department, Hôpital Européen Georges-Pompidou, Assistance Publique Hôpitaux de Paris, Centre-Université de Paris (APHP-CUP), Université Paris Cité, Innovative Therapies in Haemostasis, INSERM UMR-S1140, Paris, France
| | - Marie-Agnès Dragon-Durey
- INSERM UMRS 1138 Team "Inflammation, Complement and Cancer", Centre de Recherche des Cordeliers, Sorbonne Université, Université Paris Cité, Paris, France
- Laboratory of Immunology, Hôpital Européen Georges-Pompidou, Assistance Publique Hopitaux de Paris (APHP), Paris, France
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3
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Cole MA, Gerber GF, Chaturvedi S. Complement biomarkers in the antiphospholipid syndrome - Approaches to quantification and implications for clinical management. Clin Immunol 2023; 257:109828. [PMID: 37913840 PMCID: PMC10759159 DOI: 10.1016/j.clim.2023.109828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 10/19/2023] [Accepted: 10/21/2023] [Indexed: 11/03/2023]
Abstract
Complement is a major driver of antiphospholipid syndrome (APS) and a promising therapeutic target in refractory and catastrophic APS. Complement testing in APS is largely limited to research settings, and reliable, rapid-turnaround biomarkers are needed to predict those at risk for adverse clinical outcomes and most likely to benefit from complement inhibition. We review complement biomarkers and their association with thrombosis and obstetric outcomes, including: (i) complement proteins and activation fragments in the fluid phase; (ii) assays that evaluate complement on cell membranes (e.g. in vivo cell-bound complement fragments, hemolytic assays, and ex vivo 'functional' cell-based assays, and (iii) sequencing of complement genes. Current studies highlight the inconsistencies in testing both between studies and various aPL/APS subgroups, suggesting that either cell-based testing or multiplex panels employing a combination of biomarkers simultaneously may be most clinically relevant. Standardization of complement assays is needed to ensure reproducibility and establish clinically relevant applications.
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Affiliation(s)
- Michael A Cole
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Gloria F Gerber
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Shruti Chaturvedi
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States.
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4
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Xu S, Liu M, Xu J, Che B, Zhang W, Li W, Huang T, Yu Y, Zha C, Peng Z, Huang K, Tang K. Pregnancy complicated with adrenal adenoma causing ACTH-independent Cushing's syndrome, accompanied by obstetric antiphospholipid syndrome and severe pre-eclampsia: case report and literature review. Front Endocrinol (Lausanne) 2023; 14:1147316. [PMID: 37274343 PMCID: PMC10235702 DOI: 10.3389/fendo.2023.1147316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 05/02/2023] [Indexed: 06/06/2023] Open
Abstract
This case report shares the management experience of a patient with pregnancy combined with adrenal adenoma causing ACTH-independent Cushing's syndrome (CS), accompanied by obstetric antiphospholipid syndrome (OAPS) and severe pre-eclampsia. The case was a 26-year-old that presented with typical clinical symptoms and signs of CS. The patient had a history of 4 spontaneous abortions in the last 4 years. The 24-hour urinary free cortisol was significantly increased, an abnormal cortisol circadian rhythm was demonstrated by a high late-night salivary cortisol, blood ACTH was suppressed (< 1ng/dL), anticardiolipin antibody was positive, and imaging examination showed an adrenal tumor. The patient underwent laparoscopic adrenal tumor resection under general anesthesia at 23 weeks of gestation. The tumor was pathologically confirmed to be an adrenocortical adenoma. The patient underwent a cesarean section at 39 weeks of gestation to give birth to a healthy baby girl with an Apgar score of 10. Pregnancy complicated by CS is clinically rare, easily masked by normal physiological changes of pregnancy, and is difficult to diagnose. The determination of 24-hour urinary free cortisol, the circadian rhythm of serum cortisol, ultrasound, and MRI can be helpful in the diagnosis of CS during pregnancy. Surgery is the first choice for the treatment of CS during pregnancy. As a subtype of antiphospholipid syndrome, patients with OAPS are prone to thrombotic events and recurrent miscarriages if not treated accordingly. To our knowledge no cases of CS with OAPS and severe pre-eclampsia have been reported. We summarize the experience of the treatment of this patient and review the literature to improve clinicians' awareness of this disease.
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Affiliation(s)
- Shenghan Xu
- Department of Urology and Andrology, the First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, China
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Miao Liu
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Jiamu Xu
- The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Bangwei Che
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Wenjun Zhang
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Wei Li
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Tao Huang
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Ying Yu
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Cheng Zha
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Zheng Peng
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Kunyuan Huang
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
| | - Kaifa Tang
- Department of Urology and Andrology, the First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, China
- The Clinical Medical College of Guizhou Medical University, Guiyang, China
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5
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Misra DP, Ahmed S, Goyal M, Sharma A, Agarwal V. Venous Thromboembolism in the Inflammatory Rheumatic Diseases. Rheum Dis Clin North Am 2023; 49:97-127. [PMID: 36424029 DOI: 10.1016/j.rdc.2022.08.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Venous thromboembolism (VTE), which includes deep venous thrombosis and pulmonary embolism, is a cardiovascular event whose risk is increased in most inflammatory rheumatic diseases (IRDs). Mechanisms that increase VTE risk include antiphospholipid antibodies (APLs), particularly anticardiolipin antibodies, anti-beta2glycoprotein I antibodies and lupus anticoagulant present together, and inflammation-mediated endothelial injury. Patients with IRDs should receive long-term anticoagulation drugs when the risk of VTE recurrence is high. In the light of recent warnings from regulatory agencies regarding heightened VTE risk with Janus kinase inhibitors, these drugs should be initiated only after a careful assessment of VTE risk in those with IRDs.
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Affiliation(s)
- Durga Prasanna Misra
- Department of Clinical Immunology and Rheumatology, C block, Sanjay Gandhi Postgraduate Institute of Medical Sciences (SGPGIMS), Rae Bareli Road, Lucknow 226014, India.
| | - Sakir Ahmed
- Department of Clinical Immunology and Rheumatology, Kalinga Institute of Medical Sciences (KIMS), Bhubaneswar 751024, India. https://twitter.com/sakir_rheum
| | - Mohit Goyal
- Department of Rheumatology and Clinical Immunology, CARE Pain and Arthritis Centre, Udaipur 313002, Rajasthan, India. https://twitter.com/drmohitgoyal
| | - Aman Sharma
- Department of Internal Medicine, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh 160012, India. https://twitter.com/Amansharmapgi
| | - Vikas Agarwal
- Department of Clinical Immunology and Rheumatology, C block, Sanjay Gandhi Postgraduate Institute of Medical Sciences (SGPGIMS), Rae Bareli Road, Lucknow 226014, India. https://twitter.com/vikasagrIMMUNO
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6
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Smith-Jackson K, Harrison RA. Alternative pathway activation in pregnancy, a measured amount "complements" a successful pregnancy, too much results in adverse events. Immunol Rev 2023; 313:298-319. [PMID: 36377667 PMCID: PMC10100418 DOI: 10.1111/imr.13169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
During pregnancy, the maternal host must adapt in order to enable growth of the fetus. These changes affect all organ systems and are designed both to protect the fetus and to minimize risk to the mother. One of the most prominent adaptations involves the immune system. The semi-allogenic fetoplacental unit has non-self components and must be protected against attack from the host. This requires both attenuation of adaptive immunity and protection from innate immune defense mechanisms. One of the key innate immune players is complement, and it is important that the fetoplacental unit is not identified as non-self and subjected to complement attack. Adaptation of the complement response must, however, be managed in such a way that maternal protection against infection is not compromised. As the complement system also plays a significant facilitating role in many of the stages of a normal pregnancy, it is also important that any necessary adaptation to accommodate the semi-allogenic aspects of the fetoplacental unit does not compromise this. In this review, both the physiological role of the alternative pathway of complement in facilitating a normal pregnancy, and its detrimental participation in pregnancy-specific disorders, are discussed.
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Affiliation(s)
- Kate Smith-Jackson
- Complement Therapeutics Research Group, Translational and Clinical Research Institute, Faculty of Medical Science, Newcastle University, Newcastle-upon-Tyne, UK.,The National Renal Complement Therapeutics Centre (NRCTC), Newcastle-upon-Tyne Hospitals NHS Foundation Trust, Newcastle-upon-Tyne, UK
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7
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Dijkstra DJ, Lokki AI, Gierman LM, Borggreven NV, van der Keur C, Eikmans M, Gelderman KA, Laivuori H, Iversen AC, van der Hoorn MLP, Trouw LA. Circulating Levels of Anti-C1q and Anti-Factor H Autoantibodies and Their Targets in Normal Pregnancy and Preeclampsia. Front Immunol 2022; 13:842451. [PMID: 35432365 PMCID: PMC9009242 DOI: 10.3389/fimmu.2022.842451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 03/07/2022] [Indexed: 11/10/2022] Open
Abstract
Preeclampsia (PE) generally manifests in the second half of pregnancy with hypertension and proteinuria. The understanding of the origin and mechanism behind PE is incomplete, although there is clearly an immune component to this disorder. The placenta constitutes a complicated immune interface between fetal and maternal cells, where regulation and tolerance are key. Stress factors from placental dysfunction in PE are released to the maternal circulation evoking the maternal response. Several complement factors play a role within this intricate landscape, including C1q in vascular remodeling and Factor H (FH) as the key regulator of alternative pathway complement activation. We hypothesize that decreased levels of C1q or FH, or disturbance of their function by autoantibodies, may be associated with PE. Autoantibodies against C1q and FH and the concentrations of C1q and FH were measured by ELISA in maternal sera from women with preeclamptic and normal pregnancies. Samples originated from cohorts collected in the Netherlands (n=63 PE; n=174 control pregnancies, n=51 nonpregnant), Finland (n=181 PE; n=63 control pregnancies) and Norway (n=59 PE; n=27 control pregnancies). Serum C1q and FH concentrations were higher in control pregnancy than in nonpregnant women. No significant differences were observed for serum C1q between preeclamptic and control pregnancy in any of the three cohorts. Serum levels of FH were lower in preeclamptic pregnancies compared to control pregnancies in two of the cohorts, this effect was driven by the early onset PE cases. Neither anti-C1q autoantibodies nor anti-FH autoantibodies levels differed between women with PE and normal pregnancies. In conclusion, levels of anti-C1q and anti-FH autoantibodies are not increased in PE. C1q and FH are increased in pregnancy, but importantly, a decrease in FH concentration is associated with PE.
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Affiliation(s)
- Douwe Jan Dijkstra
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands,*Correspondence: Douwe Jan Dijkstra, ; Leendert Adrianus Trouw,
| | - A. Inkeri Lokki
- Department of Bacteriology and Immunology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland,Medical and Clinical Genetics, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Lobke Marijn Gierman
- Centre of Molecular Inflammation Research, Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
| | | | - Carin van der Keur
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands
| | - Michael Eikmans
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands
| | - Kyra Andrea Gelderman
- Department of Immunopathology and Haemostasis, Sanquin Diagnostic Services, Amsterdam, Netherlands
| | - Hannele Laivuori
- Medical and Clinical Genetics, University of Helsinki and Helsinki University Hospital, Helsinki, Finland,Institute for Molecular Medicine Finland, Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland,Department of Obstetrics and Gynecology, Tampere University Hospital and Tampere University, Faculty of Medicine and Health Technology, Tampere Center for Child, Adolescent, and Maternal Health Research, Tampere, Finland
| | | | - Ann-Charlotte Iversen
- Centre of Molecular Inflammation Research, Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
| | | | - Leendert Adrianus Trouw
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands,*Correspondence: Douwe Jan Dijkstra, ; Leendert Adrianus Trouw,
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8
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Uzonyi B, Szabó Z, Trojnár E, Hyvärinen S, Uray K, Nielsen HH, Erdei A, Jokiranta TS, Prohászka Z, Illes Z, Józsi M. Autoantibodies Against the Complement Regulator Factor H in the Serum of Patients With Neuromyelitis Optica Spectrum Disorder. Front Immunol 2021; 12:660382. [PMID: 33986750 PMCID: PMC8111293 DOI: 10.3389/fimmu.2021.660382] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 03/31/2021] [Indexed: 02/02/2023] Open
Abstract
Neuromyelitis optica spectrum disorder (NMOSD) is an autoimmune inflammatory disease of the central nervous system (CNS), characterized by pathogenic, complement-activating autoantibodies against the main water channel in the CNS, aquaporin 4 (AQP4). NMOSD is frequently associated with additional autoantibodies and antibody-mediated diseases. Because the alternative pathway amplifies complement activation, our aim was to evaluate the presence of autoantibodies against the alternative pathway C3 convertase, its components C3b and factor B, and the complement regulator factor H (FH) in NMOSD. Four out of 45 AQP4-seropositive NMOSD patients (~9%) had FH autoantibodies in serum and none had antibodies to C3b, factor B and C3bBb. The FH autoantibody titers were low in three and high in one of the patients, and the avidity indexes were low. FH-IgG complexes were detected in the purified IgG fractions by Western blot. The autoantibodies bound to FH domains 19-20, and also recognized the homologous FH-related protein 1 (FHR-1), similar to FH autoantibodies associated with atypical hemolytic uremic syndrome (aHUS). However, in contrast to the majority of autoantibody-positive aHUS patients, these four NMOSD patients did not lack FHR-1. Analysis of autoantibody binding to FH19-20 mutants and linear synthetic peptides of the C-terminal FH and FHR-1 domains, as well as reduced FH, revealed differences in the exact binding sites of the autoantibodies. Importantly, all four autoantibodies inhibited C3b binding to FH. In conclusion, our results demonstrate that FH autoantibodies are not uncommon in NMOSD and suggest that generation of antibodies against complement regulating factors among other autoantibodies may contribute to the complement-mediated damage in NMOSD.
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Affiliation(s)
- Barbara Uzonyi
- MTA-ELTE Immunology Research Group, Eötvös Loránd Research Network (ELKH), Department of Immunology, ELTE Eötvös Loránd University, Budapest, Hungary.,Department of Immunology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Zsóka Szabó
- MTA-ELTE "Lendület" Complement Research Group, Department of Immunology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Eszter Trojnár
- Department of Internal Medicine and Haematology, Semmelweis University, Budapest, Hungary.,Research Group for Immunology and Haematology, Semmelweis University-Eötvös Loránd Research Network (Office for Supported Research Groups), Budapest, Hungary
| | - Satu Hyvärinen
- Department of Bacteriology and Immunology, Medicum, and Immunobiology Research Program Unit, University of Helsinki and Helsinki University Hospital, University of Helsinki, Helsinki, Finland
| | - Katalin Uray
- MTA-ELTE Research Group of Peptide Chemistry, Eötvös Loránd Research Network (ELKH), ELTE Eötvös Loránd University, Budapest, Hungary
| | - Helle H Nielsen
- Department of Neurology, Odense University Hospital and Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Anna Erdei
- MTA-ELTE Immunology Research Group, Eötvös Loránd Research Network (ELKH), Department of Immunology, ELTE Eötvös Loránd University, Budapest, Hungary.,Department of Immunology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - T Sakari Jokiranta
- Department of Bacteriology and Immunology, Medicum, and Immunobiology Research Program Unit, University of Helsinki and Helsinki University Hospital, University of Helsinki, Helsinki, Finland
| | - Zoltán Prohászka
- Department of Internal Medicine and Haematology, Semmelweis University, Budapest, Hungary.,Research Group for Immunology and Haematology, Semmelweis University-Eötvös Loránd Research Network (Office for Supported Research Groups), Budapest, Hungary
| | - Zsolt Illes
- Department of Neurology, Odense University Hospital and Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark.,Department of Neurology, Medical School, University of Pécs, Pécs, Hungary
| | - Mihály Józsi
- Department of Immunology, ELTE Eötvös Loránd University, Budapest, Hungary.,MTA-ELTE "Lendület" Complement Research Group, Department of Immunology, ELTE Eötvös Loránd University, Budapest, Hungary.,MTA-ELTE Complement Research Group, Eötvös Loránd Research Network (ELKH), Department of Immunology, ELTE Eötvös Loránd University, Budapest, Hungary
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Tsai KL, Chang CC, Chang YS, Lu YY, Tsai IJ, Chen JH, Lin SH, Tai CC, Lin YF, Chang HW, Lin CY, Su ECY. Isotypes of autoantibodies against novel differential 4-hydroxy-2-nonenal-modified peptide adducts in serum is associated with rheumatoid arthritis in Taiwanese women. BMC Med Inform Decis Mak 2021; 21:49. [PMID: 33568149 PMCID: PMC7874460 DOI: 10.1186/s12911-020-01380-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 12/21/2020] [Indexed: 01/03/2023] Open
Abstract
Background Rheumatoid arthritis (RA) is an autoimmune disorder with systemic inflammation and may be induced by oxidative stress that affects an inflamed joint. Our objectives were to examine isotypes of autoantibodies against 4-hydroxy-2-nonenal (HNE) modifications in RA and associate them with increased levels of autoantibodies in RA patients. Methods Serum samples from 155 female patients [60 with RA, 35 with osteoarthritis (OA), and 60 healthy controls (HCs)] were obtained. Four novel differential HNE-modified peptide adducts, complement factor H (CFAH)1211–1230, haptoglobin (HPT)78–108, immunoglobulin (Ig) kappa chain C region (IGKC)2–19, and prothrombin (THRB)328–345, were re-analyzed using tandem mass spectrometric (MS/MS) spectra (ProteomeXchange: PXD004546) from RA patients vs. HCs. Further, we determined serum protein levels of CFAH, HPT, IGKC and THRB, HNE-protein adducts, and autoantibodies against unmodified and HNE-modified peptides. Significant correlations and odds ratios (ORs) were calculated. Results Levels of HPT in RA patients were greatly higher than the levels in HCs. Levels of HNE-protein adducts and autoantibodies in RA patients were significantly greater than those of HCs. IgM anti-HPT78−108 HNE, IgM anti-IGKC2−19, and IgM anti-IGKC2−19 HNE may be considered as diagnostic biomarkers for RA. Importantly, elevated levels of IgM anti-HPT78−108 HNE, IgM anti-IGKC2−19, and IgG anti-THRB328−345 were positively correlated with the disease activity score in 28 joints for C-reactive protein (DAS28-CRP). Further, the ORs of RA development through IgM anti-HPT78−108 HNE (OR 5.235, p < 0.001), IgM anti-IGKC2−19 (OR 12.655, p < 0.001), and IgG anti-THRB328−345 (OR 5.761, p < 0.001) showed an increased risk. Lastly, we incorporated three machine learning models to differentiate RA from HC and OA, and performed feature selection to determine discriminative features. Experimental results showed that our proposed method achieved an area under the receiver operating characteristic curve of 0.92, which demonstrated that our selected autoantibodies combined with machine learning can efficiently detect RA.
Conclusions This study discovered that some IgG- and IgM-NAAs and anti-HNE M-NAAs may be correlated with inflammation and disease activity in RA. Moreover, our findings suggested that IgM anti-HPT78−108 HNE, IgM anti-IGKC2−19, and IgG anti-THRB328−345 may play heavy roles in RA development.
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Affiliation(s)
- Kai-Leun Tsai
- Division of Allergy, Immunology and Rheumatology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei City, 23561, Taiwan.,Division of Allergy, Immunology and Rheumatology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, 11031, Taiwan
| | - Che-Chang Chang
- Graduate Institute of Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan
| | - Yu-Sheng Chang
- Division of Allergy, Immunology and Rheumatology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei City, 23561, Taiwan.,Division of Allergy, Immunology and Rheumatology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, 11031, Taiwan
| | - Yi-Ying Lu
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan
| | - I-Jung Tsai
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan
| | - Jin-Hua Chen
- Graduate Institute of Data Science, College of Management, Taipei Medical University, Taipei, 11031, Taiwan.,Research Center of Biostatistics, College of Management, Taipei Medical University, Taipei, 11031, Taiwan
| | - Sheng-Hong Lin
- Division of Allergy, Immunology and Rheumatology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei City, 23561, Taiwan
| | - Chih-Chun Tai
- Department of Laboratory Medicine, Taipei Medical University-Shuang-Ho Hospital, Taipei Medical University, New Taipei City, 23561, Taiwan
| | - Yi-Fang Lin
- Department of Laboratory Medicine, Taipei Medical University-Shuang-Ho Hospital, Taipei Medical University, New Taipei City, 23561, Taiwan
| | - Hui-Wen Chang
- Department of Medical Laboratory, Taipei Medical University Hospital, Taipei, 11031, Taiwan.,PhD Program in Medical Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan
| | - Ching-Yu Lin
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan. .,PhD Program in Medical Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan. .,Department of Biotechnology and Animal Science, National Ilan University, Ilan, 26047, Taiwan.
| | - Emily Chia-Yu Su
- Graduate Institute of Biomedical Informatics, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan. .,Clinical Big Data Research Center, Taipei Medical University Hospital, Taipei, 11031, Taiwan.
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10
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Chaturvedi S, Braunstein EM, Yuan X, Yu J, Alexander A, Chen H, Gavriilaki E, Alluri R, Streiff MB, Petri M, Crowther MA, McCrae KR, Brodsky RA. Complement activity and complement regulatory gene mutations are associated with thrombosis in APS and CAPS. Blood 2020; 135:239-251. [PMID: 31812994 PMCID: PMC6978159 DOI: 10.1182/blood.2019003863] [Citation(s) in RCA: 127] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 11/19/2019] [Indexed: 12/19/2022] Open
Abstract
The antiphospholipid syndrome (APS) is characterized by thrombosis and/or pregnancy morbidity in the presence of antiphospholipid antibodies, including anti-β2-glycoprotein-I (anti-β2GPI), that are considered central to APS pathogenesis. Based on animal studies showing a role of complement in APS-related clinical events, we used the modified Ham (mHam) assay (complement-dependent cell killing) and cell-surface deposition of C5b-9 to test the hypothesis that complement activation is associated with thrombotic events in APS. A positive mHam (and corresponding C5b-9 deposition) were present in 85.7% of catastrophic APS (CAPS), 35.6% of APS (and 68.5% of samples collected within 1 year of thrombosis), and only 6.8% of systemic lupus erythematosus (SLE) sera. A positive mHam assay was associated with triple positivity (for lupus anticoagulant, anticardiolipin, and anti-β2GPI antibodies) and recurrent thrombosis. Patient-derived anti-β2GPI antibodies also induced C5b-9 deposition, which was blocked completely by an anti-C5 monoclonal antibody, but not by a factor D inhibitor, indicating that complement activation by anti-β2GPI antibodies occurs primarily through the classical complement pathway. Finally, patients with CAPS have high rates of rare germline variants in complement regulatory genes (60%), compared with patients with APS (21.8%) or SLE (28.6%) or normal controls (23.3%), and have mutations at a rate similar to that of patients with atypical hemolytic uremic syndrome (51.5%). Taken together, our data suggest that anti-β2GPI antibodies activate complement and contribute to thrombosis in APS, whereas patients with CAPS have underlying mutations in complement regulatory genes that serve as a "second hit," leading to uncontrolled complement activation and a more severe thrombotic phenotype.
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Affiliation(s)
- Shruti Chaturvedi
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Evan M Braunstein
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Xuan Yuan
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Jia Yu
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Alice Alexander
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Hang Chen
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Eleni Gavriilaki
- Department of Hematology, Papanicolaou Hospital, Thessaloniki, Greece
| | - Ravi Alluri
- Division of Hematology and Medical Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH
| | - Michael B Streiff
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Michelle Petri
- Division of Rheumatology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD; and
| | - Mark A Crowther
- Department of Pathology and Molecular Medicine, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada
| | - Keith R McCrae
- Division of Hematology and Medical Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH
| | - Robert A Brodsky
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
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11
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Tabacco S, Giannini A, Garufi C, Botta A, Salvi S, Del Sordo G, Benedetti Panici P, Lanzone A, De Carolis S. Complementemia in pregnancies with antiphospholipid syndrome. Lupus 2019; 28:1503-1509. [PMID: 31623520 DOI: 10.1177/0961203319882507] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Prognosis of pregnancies in women with antiphospholipid syndrome has dramatically improved over the past two decades using conventional treatment with low molecular weight heparin and low-dose aspirin. However, despite this regimen, 10-15% of antiphospholipid syndrome patients experience pregnancy losses. Several studies have been performed in order to identify risk factors predictive of complications. Thrombosis has been generally accepted as the key pathogenetic mechanism underlying pregnancy morbidity. However, the thrombogenic state alone is not able to explain all the different mechanisms leading to pregnancy failure. In fact, emerging evidence shows that complement pathway could play an important role in mediating clinical events in antiphospholipid syndrome. However, the exact mechanism through which complement mediates antiphospholipid syndrome complications remains unknown. Low complement levels (C3 and C4) are associated with poor pregnancy outcome in women with antiphospholipid syndrome in different studies. Hypocomplementemia could be indicated as an early predictor of adverse pregnancy outcome, available at the beginning of pregnancy for starting, if necessary, additional treatment to conventional therapy. However, future studies need to better understand the impact of low complement level on antiphospholipid syndrome pregnancy outcome.
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Affiliation(s)
- S Tabacco
- Department of Gynaecology Obstetrics and Urology, "Sapienza" University of Rome, Rome, Italy
| | - A Giannini
- Department of Gynaecology Obstetrics and Urology, "Sapienza" University of Rome, Rome, Italy
| | - C Garufi
- Lupus Clinic, "Sapienza" University of Rome, Rome, Italy
| | - A Botta
- UOC di Patologia Ostetrica, Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italia
| | - S Salvi
- UOC di Patologia Ostetrica, Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italia
| | - G Del Sordo
- Istituto di Clinica Ostetrica e Ginecologica, Università Cattolica del Sacro Cuore, Roma, Italia
| | - P Benedetti Panici
- Department of Gynaecology Obstetrics and Urology, "Sapienza" University of Rome, Rome, Italy
| | - A Lanzone
- UOC di Patologia Ostetrica, Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italia.,Istituto di Clinica Ostetrica e Ginecologica, Università Cattolica del Sacro Cuore, Roma, Italia
| | - S De Carolis
- UOC di Patologia Ostetrica, Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italia.,Istituto di Clinica Ostetrica e Ginecologica, Università Cattolica del Sacro Cuore, Roma, Italia
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12
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Complement and Coagulation: Cross Talk Through Time. Transfus Med Rev 2019; 33:199-206. [PMID: 31672340 DOI: 10.1016/j.tmrv.2019.08.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 08/24/2019] [Indexed: 12/29/2022]
Abstract
Two complex protein defense systems-complement and coagulation-are based on amplifying enzyme cascades triggered by specific local stimuli. Excess systemic activation of either system is pathologic and is normally prevented by a family of regulatory proteins. The 2 systems are ancient biological processes which share a common origin that predates vertebrate evolution. Recent research has uncovered multiple opportunities for cross talk between complement and coagulation including proteins traditionally viewed as coagulation factors that activate and regulate complement, and proteins traditionally seen as part of the complement system that participate in coagulation. Ten examples of cross talk between the 2 systems are described. The mutual engagement of both systems is increasingly recognized to occur in human diseases. Three conditions-paroxysmal nocturnal hemoglobinuria, atypical hemolytic uremic syndrome, and the antiphospholipid syndrome-provide examples of the importance of interactions between complement and coagulation in human biology. A better understanding of the mutual engagement of these 2 ancient defense systems is expected to result in improved diagnostics and new treatments for systemic diseases.
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13
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Kiss MG, Ozsvár-Kozma M, Porsch F, Göderle L, Papac-Miličević N, Bartolini-Gritti B, Tsiantoulas D, Pickering MC, Binder CJ. Complement Factor H Modulates Splenic B Cell Development and Limits Autoantibody Production. Front Immunol 2019; 10:1607. [PMID: 31354740 PMCID: PMC6637296 DOI: 10.3389/fimmu.2019.01607] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 06/27/2019] [Indexed: 12/31/2022] Open
Abstract
Complement factor H (CFH) has a pivotal role in regulating alternative complement activation through its ability to inhibit the cleavage of the central complement component C3, which links innate and humoral immunity. However, insights into the role of CFH in B cell biology are limited. Here, we demonstrate that deficiency of CFH in mice leads to altered splenic B cell development characterized by the accumulation of marginal zone (MZ) B cells. Furthermore, B cells in Cfh−/− mice exhibit enhanced B cell receptor (BCR) signaling as evaluated by increased levels of phosphorylated Bruton's tyrosine kinase (pBTK) and phosphorylated spleen tyrosine kinase (pSYK). We show that enhanced BCR activation is associated with uncontrolled C3 consumption in the spleen and elevated complement receptor 2 (CR2, also known as CD21) levels on the surface of mature splenic B cells. Moreover, aged Cfh−/− mice developed splenomegaly with distorted spleen architecture and spontaneous B cell-dependent autoimmunity characterized by germinal center hyperactivity and a marked increase in anti-double stranded DNA (dsDNA) antibodies. Taken together, our data indicate that CFH, through its function as a complement repressor, acts as a negative regulator of BCR signaling and limits autoimmunity.
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Affiliation(s)
- Máté G Kiss
- Department for Laboratory Medicine, Medical University of Vienna, Vienna, Austria.,CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Mária Ozsvár-Kozma
- Department for Laboratory Medicine, Medical University of Vienna, Vienna, Austria.,CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Florentina Porsch
- Department for Laboratory Medicine, Medical University of Vienna, Vienna, Austria.,CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Laura Göderle
- Department for Laboratory Medicine, Medical University of Vienna, Vienna, Austria.,CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Nikolina Papac-Miličević
- Department for Laboratory Medicine, Medical University of Vienna, Vienna, Austria.,CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Barbara Bartolini-Gritti
- Department for Laboratory Medicine, Medical University of Vienna, Vienna, Austria.,CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Dimitrios Tsiantoulas
- Department for Laboratory Medicine, Medical University of Vienna, Vienna, Austria.,CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | | | - Christoph J Binder
- Department for Laboratory Medicine, Medical University of Vienna, Vienna, Austria.,CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
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14
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Chaturvedi S, Brodsky RA, McCrae KR. Complement in the Pathophysiology of the Antiphospholipid Syndrome. Front Immunol 2019; 10:449. [PMID: 30923524 PMCID: PMC6426753 DOI: 10.3389/fimmu.2019.00449] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Accepted: 02/19/2019] [Indexed: 12/16/2022] Open
Abstract
The antiphospholipid syndrome (APS) is characterized by thrombosis and pregnancy morbidity in the presence of antiphospholipid antibodies (aPL). Complement is a system of enzymes and regulatory proteins of the innate immune system that plays a key role in the inflammatory response to pathogenic stimuli. The complement and coagulation pathways are closely linked, and expanding data indicate that complement may be activated in patients with aPL and function as a cofactor in the pathogenesis of aPL-associated clinical events. Complement activation by aPL generates C5a, which induces neutrophil tissue factor-dependent procoagulant activity. Beta-2-glycoprotein I, the primary antigen for pathogenic aPL, has complement regulatory effects in vitro. Moreover, aPL induce fetal loss in wild-type mice but not in mice deficient in specific complement components (C3, C5). Antiphospholipid antibodies also induce thrombosis in wild type mice and this effect is attenuated in C3 or C6 deficient mice, or in the presence of a C5 inhibitor. Increased levels of complement activation products have been demonstrated in sera of patients with aPL, though the association with clinical events remains unclear. Eculizumab, a terminal complement inhibitor, has successfully been used to treat catastrophic APS and prevent APS-related thrombotic microangiopathy in the setting of renal transplant. However, the mechanisms of complement activation in APS, its role in the pathogenesis of aPL related complications in humans, and the potential of complement inhibition as a therapeutic target in APS require further study.
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Affiliation(s)
- Shruti Chaturvedi
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Robert A Brodsky
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Keith R McCrae
- Hematologic Oncology and Blood Disorders, Taussig Cancer Institute, Cleveland, OH, United States.,Department of Cellular and Molecular Medicine, Cleveland Clinic, Cleveland, OH, United States
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15
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Abstract
The complement system is a part of the immune system implicated in host defense against pathogens and damaged cells and Factor H is the main regulatory protein of this powerful enzymatic cascade. Autoantibodies directed against Factor H (anti-FH antibodies) are implicated in different pathologies mainly atypical hemolytic and uremic syndrome and C3 glomerulopathies. The detection and quantification of these autoantibodies are crucial for the clinical management of the patients.Anti-Factor H antibodies are detected and quantified by an ELISA assay. The aim of this chapter is to describe the procedure to determine anti-FH autoantibodies and to provide information about their biological significance.
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16
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Noureldine MHA, Nour-Eldine W, Khamashta MA, Uthman I. Insights into the diagnosis and pathogenesis of the antiphospholipid syndrome. Semin Arthritis Rheum 2018; 48:860-866. [PMID: 30217394 DOI: 10.1016/j.semarthrit.2018.08.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 07/30/2018] [Accepted: 08/14/2018] [Indexed: 11/16/2022]
Abstract
The Antiphospholipid syndrome (APS), formerly known as Anticardiolipin or Hughes syndrome, is a systemic autoimmune disorder characterized by obstetrical complications and thrombotic events affecting almost every organ-system in patients persistently testing positive for antiphospholipid antibodies (aPL). The contribution of the extra-criteria aPL to the pathogenesis of APS have exceeded the expectations of a simple, direct pathologic 'hit' leading to thrombogenesis or obstetrical complications, and more pathologic pathways are being linked directly or indirectly to aPL. The value of extra-criteria aPL is on the rise, and these antibodies are nowadays evaluated as markers for risk assessment in the diagnostic approach to APS. A diagnosis of APS should be considered in pediatric patients with suggestive clinical and laboratory picture. Management of APS remains mostly based on anticoagulation, while other drugs are being tested for efficacy and side effects. Low-dose aspirin may have a role in the management of thrombotic and obstetric APS. Due to the high variability in disease severity and complication recurrence outcomes, new tools are being developed and validated to assess the damage index and quality of life of APS patients.
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Affiliation(s)
| | - Wared Nour-Eldine
- Department of Biochemistry and Molecular Genetics, Faculty of Medicine, American University of Beirut, Beirut, Lebanon
| | | | - Imad Uthman
- Division of Rheumatology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon.
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17
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Nakamura H, Oku K, Ogata Y, Ohmura K, Yoshida Y, Kitano E, Fujieda Y, Kato M, Bohgaki T, Amengual O, Yasuda S, Fujimura Y, Seya T, Atsumi T. Alternative pathway activation due to low level of complement factor H in primary antiphospholipid syndrome. Thromb Res 2018; 164:63-68. [PMID: 29494857 DOI: 10.1016/j.thromres.2018.02.142] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 01/25/2018] [Accepted: 02/19/2018] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Although complement activation has been proposed as a possible thrombophilic mechanism in antiphospholipid syndrome (APS), the origin of complement activation in APS remains unclear. Here, we focused on complement regulatory factors (CRF), which control the complement system to prevent damage to host tissue. We evaluated the function of two major CRF, membrane cofactor protein (MCP) and factor H (FH), in APS patients. MATERIALS AND METHODS In this study, we analyzed preserved serum samples from 27 patients with primary APS (PAPS), 20 with APS complicated with SLE (APS + SLE), 24 with SLE (SLE), and 25 with other connective tissue diseases (Other CTD). Serum MCP and FH levels were tested by ELISA. Autoantibodies against FH were determined by both ELISA and western-blotting. RESULTS Serum complement levels of PAPS were lower than those of other CTD (median C3: 82 vs 112 mg/dL, p < 0.01, C4: 15 vs 22 mg/dL, p < 0.05). Serum MCP levels did not significantly differ among the groups. Serum FH levels were significantly lower in PAPS patients compared with SLE or other CTD (median 204, 1275, and 1220 μg/mL, respectively, p < 0.01). In PAPS patients, serum FH levels were positively correlated with serum C3 levels (p < 0.01, R = 0.55), but no correlation was found with serum C4 levels (p = 0.22, R = 0.33). Autoantibodies against FH were not detected in any of our patients. CONCLUSIONS Activation of the alternative complement pathway due to low level of FH is one of the possible thrombophilic mechanisms in PAPS.
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Affiliation(s)
- Hiroyuki Nakamura
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Kenji Oku
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan.
| | - Yusuke Ogata
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Kazumasa Ohmura
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Yoko Yoshida
- Department of Blood Transfusion Medicine, Nara Medical University, Shijo-cho 840, Kashihara 634-8521, Japan
| | - Etsuko Kitano
- Department of Clinical Laboratory Science, Kobe Tokiwa University, Ohtani-cho 2-6-6, Nagata-ku, Kobe 653-0838, Japan
| | - Yuichiro Fujieda
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Masaru Kato
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Toshiyuki Bohgaki
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Olga Amengual
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Shinsuke Yasuda
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Yoshihiro Fujimura
- Department of Blood Transfusion Medicine, Nara Medical University, Shijo-cho 840, Kashihara 634-8521, Japan
| | - Tsukasa Seya
- Department of Vaccine Immunology, Faculty of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
| | - Tatsuya Atsumi
- Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo 060-8638, Japan
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18
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Brocklebank V, Kavanagh D. Complement C5-inhibiting therapy for the thrombotic microangiopathies: accumulating evidence, but not a panacea. Clin Kidney J 2017; 10:600-624. [PMID: 28980670 PMCID: PMC5622895 DOI: 10.1093/ckj/sfx081] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 06/21/2017] [Indexed: 02/07/2023] Open
Abstract
Thrombotic microangiopathy (TMA), characterized by organ injury occurring consequent to severe endothelial damage, can manifest in a diverse range of diseases. In complement-mediated atypical haemolytic uraemic syndrome (aHUS) a primary defect in complement, such as a mutation or autoantibody leading to over activation of the alternative pathway, predisposes to the development of disease, usually following exposure to an environmental trigger. The elucidation of the pathogenesis of aHUS resulted in the successful introduction of the complement inhibitor eculizumab into clinical practice. In other TMAs, although complement activation may be seen, its role in the pathogenesis remains to be confirmed by an interventional trial. Although many case reports in TMAs other than complement-mediated aHUS hint at efficacy, publication bias, concurrent therapies and in some cases the self-limiting nature of disease make broader interpretation difficult. In this article, we will review the evidence for the role of complement inhibition in complement-mediated aHUS and other TMAs.
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Affiliation(s)
- Vicky Brocklebank
- The National Renal Complement Therapeutics Centre (NRCTC), Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - David Kavanagh
- The National Renal Complement Therapeutics Centre (NRCTC), Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
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19
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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: 127] [Impact Index Per Article: 18.1] [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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20
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Chaturvedi S, McCrae KR. Diagnosis and management of the antiphospholipid syndrome. Blood Rev 2017; 31:406-417. [PMID: 28784423 DOI: 10.1016/j.blre.2017.07.006] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 06/22/2017] [Accepted: 07/28/2017] [Indexed: 12/14/2022]
Abstract
Antiphospholipid syndrome (APS) is characterized by thrombosis and/or pregnancy complications in the presence of persistent antiphospholipid antibodies (APLA). Laboratory diagnosis of APLA depends upon the detection of a lupus anticoagulant, which prolongs phospholipid-dependent anticoagulation tests, and/or anticardiolipin (aCL) and anti-β2-glycoprotein-1 (β2GPI) antibodies. APLA are primarily directed toward phospholipid binding proteins. Pathophysiologic mechanisms underlying thrombosis and pregnancy loss in APS include APLA induced cellular activation, inhibition of natural anticoagulant and fibrinolytic systems, and complement activation, among others. There is a high rate of recurrent thrombosis in APS, especially in triple positive patients (patients with lupus anticoagulant, aCL and anti-β2GPI antibodies), and indefinite anticoagulation with a vitamin K antagonist is the standard of care for thrombotic APS. There is currently insufficient evidence to recommend the routine use of direct oral anticoagulants (DOAC) in thrombotic APS. Aspirin with low molecular weight or unfractionated heparin may reduce the incidence of pregnancy loss in obstetric APS. Recent insights into the pathogenesis of APS have led to the identification of new potential therapeutic interventions, including anti-inflammatory and immunomodulatory therapies. Additional research is needed to better understand the effects of APLA on activation of signaling pathways in vascular cells, to identify more predictive biomarkers that define patients at greatest risk for a first or recurrent APLA-related clinical event, and to determine the safety and efficacy of DOACs and novel anti-inflammatory and immune-modulatory therapies for refractory APS.
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Affiliation(s)
- Shruti Chaturvedi
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Keith R McCrae
- Department of Hematology and Solid Tumor Oncology, Cleveland Clinic, Cleveland, OH 44195, USA.
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21
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Antibodies Against Complement Components: Relevance for the Antiphospholipid Syndrome-Biomarkers of the Disease and Biopharmaceuticals. Curr Rheumatol Rep 2017. [PMID: 28631067 DOI: 10.1007/s11926-017-0669-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
PURPOSE OF REVIEW Laboratory criterion for the diagnosis of antiphospholipid syndrome (APS) is the presence of antiphospholipid antibodies (aPL Abs). Complement system has a role in mediating aPL Abs-induced thrombosis in animal models. The importance of antibodies against complement components (potential biomarkers of APS) and the importance of antibodies with beneficial anti-complement effects in APS (as biopharmaceuticals) are reviewed. RECENT FINDINGS Antibodies against complement components described in APS patients, so far, are anti-C1q and anti-factor H Abs, although anti-factor B Abs and anti-C5a Abs were described in animal models of APS. Clinical studies in APS patients are limited to a small number of case reports. Studies that would confirm potential role of Abs against complement components (as potential biomarkers of APS) are lacking. Lack of randomized clinical trials (that would provide complete data for confirmation of beneficial effects of biopharmaceuticals in complement inhibition) in APS is alarming.
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Complement and thrombosis in the antiphospholipid syndrome. Autoimmun Rev 2016; 15:1001-4. [DOI: 10.1016/j.autrev.2016.07.020] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 07/09/2016] [Indexed: 02/05/2023]
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Stanisavljevic N, Stojanovich L, Marisavljevic D, Djokovic A, Dopsaj V, Kotur-Stevuljevic J, Martinovic J, Memon L, Radovanovic S, Todic B, Lisulov D. Lipid peroxidation as risk factor for endothelial dysfunction in antiphospholipid syndrome patients. Clin Rheumatol 2016; 35:2485-93. [PMID: 27562033 DOI: 10.1007/s10067-016-3369-8] [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: 04/15/2016] [Revised: 06/06/2016] [Accepted: 07/25/2016] [Indexed: 01/22/2023]
Abstract
The aim of this study was to evaluate oxidative stress markers and it relations to endothelial damage as risk factor for thrombosis in patients with primary (PAPS) and secondary (SAPS) antiphospholipid syndrome (APS) in correlation to traditional risk factors. Flow-mediated (FMD) and nitroglycerine (NMD)-induced dilation of the brachial artery were studied in 140 APS patients (90 PAPS, 50 SAPS) and 40 controls matched by age, sex, and conventional risk factors for atherosclerosis. Markers of oxidative stress, lipid hydroperoxydes (LOOH), advanced oxidation protein products (AOPP), total sulfhydryl groups (tSHG), and paraoxonase 1 activity (PON1) were determined by spectrophotometric method. Oxidative stress dominates in APS patients. LOOH and AOPP correlate to lipid fractions (p < 0.05), unlike PON1, tSHG that correlated to antiphospholipid antibody positivity (p < 0.05). FMD was lower in APS patients comparing to controls (p < 0.001). Cholesterol is independent variable for FMD impairment in control group (p = 0.011); LOOH in PAPS (p = 0.004); LOOH, aCL, and triglycerides in SAPS patients (p = 0.009, p = 0.049, and p = 0.012, respectively). Combined predictive of aCL and LOOH is better for FMD impairment than LOOH alone in both PAPS and SAPS patients (AUC 0.727, p = 0.001, 95 % CI 0.616-0.837 and AUC 0.824, p˂0.001, 95 % CI 0.690-0.957, respectively). Lipid peroxidation is independent predictor for endothelial dysfunction in APS patients. We demonstrated synergistic effect of aCL and LOOH as risk for endothelial impairment in both PAPS and SAPS patients.
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Affiliation(s)
- Natasa Stanisavljevic
- University Clinical Center "Bezanijska kosa", Bezanijska kosa bb, Belgrade, 11070, Serbia.
| | - L Stojanovich
- University Clinical Center "Bezanijska kosa", Bezanijska kosa bb, Belgrade, 11070, Serbia
| | - D Marisavljevic
- University Clinical Center "Bezanijska kosa", Bezanijska kosa bb, Belgrade, 11070, Serbia.,Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - A Djokovic
- University Clinical Center "Bezanijska kosa", Bezanijska kosa bb, Belgrade, 11070, Serbia.,Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - V Dopsaj
- Clinical Center of Serbia, Faculty of Pharmacy Belgrade, University of Belgrade, Belgrade, Serbia
| | - J Kotur-Stevuljevic
- Institute of Medical Biochemistry, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia
| | - J Martinovic
- Rakovica Community Health Center, Belgrade, Serbia
| | - L Memon
- University Clinical Center "Bezanijska kosa", Bezanijska kosa bb, Belgrade, 11070, Serbia
| | - S Radovanovic
- University Clinical Center "Bezanijska kosa", Bezanijska kosa bb, Belgrade, 11070, Serbia
| | - B Todic
- University Clinical Center "Bezanijska kosa", Bezanijska kosa bb, Belgrade, 11070, Serbia
| | - D Lisulov
- University Clinical Center "Bezanijska kosa", Bezanijska kosa bb, Belgrade, 11070, Serbia
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