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Paroli M, Gioia C, Accapezzato D. New Insights into Pathogenesis and Treatment of ANCA-Associated Vasculitis: Autoantibodies and Beyond. Antibodies (Basel) 2023; 12:antib12010025. [PMID: 36975372 PMCID: PMC10045085 DOI: 10.3390/antib12010025] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 01/29/2023] [Accepted: 03/14/2023] [Indexed: 03/29/2023] Open
Abstract
Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis is a group of rare systemic diseases affecting small-caliber vessels. The damage caused by AAV mainly involves the lung and kidneys. AAV includes three different types: granulomatosis with polyangiitis (GPA), microscopic polyangiitis (MPA), and eosinophilic granulomatosis with polyangiitis (EGPA). Although the different phenotypic forms of AAV share common features, recent studies have shown that there are significant differences in terms of pathogenetic mechanisms involving both the adaptive and innate immune systems. Advances in our understanding of pathogenesis have enabled the development of immuno-targeted therapies. This review illustrates the characteristics of the various forms of AAV and the new therapies available for this disease that can have lethal consequences if left untreated.
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Affiliation(s)
- Marino Paroli
- Division of Clinical Immunology, Department of Clinical, Anesthesiologic and Cardiovascular Sciences, Sapienza University of Rome, 00185 Rome, Italy
| | - Chiara Gioia
- Division of Clinical Immunology, Department of Clinical, Anesthesiologic and Cardiovascular Sciences, Sapienza University of Rome, 00185 Rome, Italy
| | - Daniele Accapezzato
- Division of Clinical Immunology, Department of Clinical, Anesthesiologic and Cardiovascular Sciences, Sapienza University of Rome, 00185 Rome, Italy
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Néel A, Degauque N, Bruneau S, Braudeau C, Bucchia M, Caristan A, De Mornac D, Genin V, Glemain A, Oriot C, Rimbert M, Brouard S, Josien R, Hamidou M. [Pathogenesis of ANCA-associated vasculitides in 2021: An update]. Rev Med Interne 2022; 43:89-97. [PMID: 35033384 DOI: 10.1016/j.revmed.2021.11.002] [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: 05/07/2021] [Revised: 10/22/2021] [Accepted: 11/04/2021] [Indexed: 10/19/2022]
Abstract
Anticytoplasmic neutrophil antibodies (ANCA)-associated vasculitis (AAV) are rare systemic immune-mediated diseases characterized by small vessel necrotizing vasculitis and/or respiratory tract inflammation. Over the last 2 decades, anti-MPO vasculitis mouse model has enlightened the role of ANCA, neutrophils, complement activation, T helper cells (Th1, Th17) and microbial agents. In humans, CD4T cells have been extensively studied, while the dramatic efficacy of rituximab demonstrated the key role of B cells. Many areas of uncertainty remain, such as the driving force of GPA extra-vascular granulomatous inflammation and the relapse risk of anti-PR3 AAV pathogenesis. Animal models eventually led to identify complement activation as a promising therapeutic target. New investigation tools, which permit in depth immune profiling of human blood and tissues, may open a new era for the studying of AAV pathogenesis.
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Affiliation(s)
- A Néel
- Service de médecine interne, CHU de Nantes, Nantes, France; Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France; Centre de référence maladies auto-immunes systémiques Rares, hôpital Cochin, AP-HP, Paris, France.
| | - N Degauque
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France
| | - S Bruneau
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France
| | - C Braudeau
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France; Laboratoire d'immunologie, CHU de Nantes, Nantes, France
| | - M Bucchia
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France; Service de pédiatrie, CHU de Nantes, Nantes, France
| | - A Caristan
- Service de médecine interne, CHD Vendée, La-Roche-Sur-Yon, France
| | - D De Mornac
- Service de médecine interne, CHU de Nantes, Nantes, France; Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France
| | - V Genin
- Service de médecine interne, CHU de Nantes, Nantes, France; Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France
| | - A Glemain
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France
| | - C Oriot
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France; Service de pédiatrie, CHU de Nantes, Nantes, France
| | - M Rimbert
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France; Laboratoire d'immunologie, CHU de Nantes, Nantes, France
| | - S Brouard
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France
| | - R Josien
- Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France; Laboratoire d'immunologie, CHU de Nantes, Nantes, France
| | - M Hamidou
- Service de médecine interne, CHU de Nantes, Nantes, France; Inserm, centre de recherche en transplantation et immunologie, UMR 1064, université de Nantes, Nantes, France
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Sciascia S, Ponticelli C, Roccatello D. Pathogenesis-based new perspectives of management of ANCA-associated vasculitis. Autoimmun Rev 2021; 21:103030. [PMID: 34971805 DOI: 10.1016/j.autrev.2021.103030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 12/25/2021] [Indexed: 11/28/2022]
Abstract
While the pathogenesis of anti-neutrophil cytoplasmic autoantibody associated vasculitis (AAV) is still not fully elucidated, there is a mounting evidence that it is initiated by inflammation and activation of innate immunity in the presence of predisposing factors, innate immunity, aberrant responses of the adaptive immune system, and complement system activation. Biologics targeting inflammation-related molecules in the immune system have been explored to treat AVV, and these treatments have provided revolutionary advances. When focusing on the pathogenic mechanisms of AVV, this review presents the new findings regarding novel therapeutic approaches for the management of these conditions.
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Affiliation(s)
- Savino Sciascia
- CMID-Nephrology and Dialysis Unit (ERK-net Member), Center of Research of Immunopathology and Rare Diseases- Coordinating Center of the Network for Rare Diseases of Piedmont and Aosta Valley, Department of Clinical and Biological Sciences, University of Turin and S. Giovanni Bosco Hub Hospital, Turin, Italy
| | | | - Dario Roccatello
- CMID-Nephrology and Dialysis Unit (ERK-net Member), Center of Research of Immunopathology and Rare Diseases- Coordinating Center of the Network for Rare Diseases of Piedmont and Aosta Valley, Department of Clinical and Biological Sciences, University of Turin and S. Giovanni Bosco Hub Hospital, Turin, Italy.
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London J, Dumoitier N, Lofek S, Dion J, Chaigne B, Mocek J, Thieblemont N, Cohen P, Le Jeunne C, Guillevin L, Witko-Sarsat V, Varin-Blank N, Terrier B, Mouthon L. Skewed peripheral B- and T-cell compartments in patients with ANCA-associated vasculitis. Rheumatology (Oxford) 2021; 60:2157-2168. [PMID: 33026090 DOI: 10.1093/rheumatology/keaa432] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Revised: 06/04/2020] [Indexed: 01/30/2023] Open
Abstract
OBJECTIVES To characterize lymphocytes dysregulation in patients with granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA). METHODS Using flow cytometry, we analysed B- and T-cell subsets in peripheral blood from 37 untreated patients with active disease (29 GPA and 8 MPA) and 22 healthy controls (HCs). RESULTS GPA patients had increased Th2 (1.8 vs 1.0%, P = 0.02), Th9 (1.1 vs 0.2%, P = 0.0007) and Th17 (1.4 vs 0.9%, P = 0.03) cells compared with HC. Patients with MPO-ANCAs had significantly more CD21- B cells than HC or PR3-ANCA patients (6.9 vs 3.3% and 4.4%, P = 0.01). CD69 expressing B cells were significantly higher in GPA and MPA (3.0 and 5.9 vs 1.4%, P = 0.02 and P = 0.03, respectively) compared with HC, whereas B-cell activating factor-receptor expression was decreased in GPA and MPA (median fluorescence intensity ratio 11.8 and 13.7 vs 45.1 in HC, P < 0.0001 and P = 0.003, respectively). Finally, IL-6-producing B cells were increased in GPA vs HC (25.8 vs 14.9%, P < 0.0001) and decreased in MPA vs HC (4.6 vs 14.9%, P = 0.005), whereas TNF-α-producing B cells were lower in both GPA and MPA patients compared with controls (15 and 8.4 vs 30%, P = 0.01 and P = 0.006, respectively). CONCLUSION Skewed T-cell polarization towards Th2, Th9 and Th17 responses characterizes GPA, whereas B-cell populations are dysregulated in both GPA and MPA with an activated phenotype and a decreased B-cell activating factor-receptor expression. Finally, inflammatory B cells producing IL-6 are dramatically increased in GPA, providing an additional mechanism by which rituximab could be effective.
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Affiliation(s)
- Jonathan London
- INSERM U1016/CNRS UMR 8104, Institut Cochin.,Université Paris Descartes.,Service de Médecine Interne, Centre de Référence Maladies Systémiques Autoimmunes Rares d'Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris
| | - Nicolas Dumoitier
- INSERM U1016/CNRS UMR 8104, Institut Cochin.,Université Paris Descartes.,LABEX Inflamex.,Université Paris Diderot, Paris
| | | | - Jérémie Dion
- INSERM U1016/CNRS UMR 8104, Institut Cochin.,Université Paris Descartes.,Service de Médecine Interne, Centre de Référence Maladies Systémiques Autoimmunes Rares d'Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris
| | - Benjamin Chaigne
- INSERM U1016/CNRS UMR 8104, Institut Cochin.,Université Paris Descartes.,Service de Médecine Interne, Centre de Référence Maladies Systémiques Autoimmunes Rares d'Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris
| | | | | | - Pascal Cohen
- Service de Médecine Interne, Centre de Référence Maladies Systémiques Autoimmunes Rares d'Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris
| | - Claire Le Jeunne
- Université Paris Descartes.,Service de Médecine Interne, Centre de Référence Maladies Systémiques Autoimmunes Rares d'Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris
| | - Loïc Guillevin
- Université Paris Descartes.,Service de Médecine Interne, Centre de Référence Maladies Systémiques Autoimmunes Rares d'Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris
| | | | - Nadine Varin-Blank
- Université Paris XIII, UFR Santé Médecine Biologie Humaine, Bobigny.,INSERM U978, Bobigny, France
| | - Benjamin Terrier
- INSERM U1016/CNRS UMR 8104, Institut Cochin.,Université Paris Descartes.,Service de Médecine Interne, Centre de Référence Maladies Systémiques Autoimmunes Rares d'Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris
| | - Luc Mouthon
- INSERM U1016/CNRS UMR 8104, Institut Cochin.,Université Paris Descartes.,Service de Médecine Interne, Centre de Référence Maladies Systémiques Autoimmunes Rares d'Ile de France, Hôpital Cochin, Assistance Publique-Hôpitaux de Paris.,LABEX Inflamex
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Yoon T, Ahn SS, Song JJ, Park YB, Lee SW. Serum interleukin-21 positivity could indicate the current activity of antineutrophil cytoplasmic antibody-associated vasculitis: a monocentric prospective study. Clin Rheumatol 2019; 38:1685-1690. [PMID: 30863949 DOI: 10.1007/s10067-019-04506-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 02/15/2019] [Accepted: 03/05/2019] [Indexed: 10/27/2022]
Abstract
Interleukin-21 (IL-21) is a pleotropic cytokine that plays an important role in the regulation of both innate and adaptive immune responses. In the present study, we investigated whether serum IL-21 positivity is associated with disease activity in patients with all variants of antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV). Sixty patients with AAV from a monocentric prospective cohort were enrolled from November 2016 to May 2018 in this study. On the day of visit, clinical manifestations including Birmingham vasculitis activity score (BVAS) were assessed, routine laboratory tests were performed, and blood samples were collected. Isolated sera were stored at - 80 °C on the same day to measure serum IL-21. The definition of generalised AAV set by the European Vasculitis Study group was adopted. In addition, serum IL-21 positivity was compared between patients with different autoimmune diseases and healthy controls. The mean age was 59.3 years, and 39 patients (65.0%) were women. Of patients, 23 (38.3%) had new-onset AAV, whereas 28 (46.7%) had generalised AAV. Serum IL-21 was detected in 16 patients (26.7%). Patients with serum IL-21 positivity exhibited a higher risk of having generalised AAV than those without (relative risk 5.250, p = 0.012). No difference in serum IL-21 positivity was observed among patients with AAV, rheumatoid arthritis, and systemic lupus erythematosus and healthy controls. Among patients with serum IL-21 positivity, serum IL-21 became negative at initial visit following the decrease in BVAS. Serum IL-21 positivity might be a useful biomarker to indicate the disease activity of AAV.
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Affiliation(s)
- Taejun Yoon
- Department of Medical Science, BK21 Plus Project, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Sung Soo Ahn
- Division of Rheumatology, Department of Internal Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Jason Jungsik Song
- Division of Rheumatology, Department of Internal Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.,Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Yong-Beom Park
- Division of Rheumatology, Department of Internal Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.,Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Sang-Won Lee
- Division of Rheumatology, Department of Internal Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea. .,Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, Republic of Korea.
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6
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Humbert S, Guilpain P, Puéchal X, Terrier B, Rivière S, Mahr A, Pagnoux C, Bagnères D, Cordier JF, Le Quellec A, Altwegg R, Guillevin L. Inflammatory bowel diseases in anti-neutrophil cytoplasmic antibody-associated vasculitides: 11 retrospective cases from the French Vasculitis Study Group. Rheumatology (Oxford) 2015; 54:1970-5. [PMID: 26106214 DOI: 10.1093/rheumatology/kev199] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVE Coexistence of ANCA-associated vasculitis (AAV) and IBD is a rare condition that is rarely described in the literature. The aim of the study was to describe the main characteristics of patients presenting with both IBD and AAV. METHODS A retrospective study of AAV patients in the French Vasculitis Study Group cohort who also had a diagnosis of IBD was conducted. We reviewed the medical records and outcomes of these patients. RESULTS We identified 11 patients with AAV and IBD. Four patients with eosinophilic granulomatosis with polyangiitis (Churg-Strauss) also had ulcerative colitis and seven patients with granulomatosis with polyangiitis (GPA) had Crohn's disease. No Crohn's disease was observed in eosinophilic GPA and no ulcerative colitis in GPA. IBD started before AAV manifestations in six cases, simultaneously in two cases and after AAV manifestations in three cases. CONCLUSION Coexistence of IBD and AAV is a rare condition. The therapeutic management of these patients includes corticosteroids in all cases and immunosuppressive drugs in some patients. Coexistence of IBD and AAV might be explained by common underlying inflammatory responses and cytokine profiles polarized towards either Th1 or Th2. Finally, in the presence of digestive manifestations in the context of AAV, the hypothesis of IBD should be assessed.
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Affiliation(s)
- Sébastien Humbert
- Service de Médecine Interne, Université Montpellier 1, Maladies Multi-organiques, centre de compétence des maladies systémiques et auto-immunes rares de l'adulte, Hôpital Saint-Eloi, CHRU de Montpellier, Montpellier
| | - Philippe Guilpain
- Service de Médecine Interne, Université Montpellier 1, Maladies Multi-organiques, centre de compétence des maladies systémiques et auto-immunes rares de l'adulte, Hôpital Saint-Eloi, CHRU de Montpellier, Montpellier,
| | - Xavier Puéchal
- Faculté de Médecine, Université Paris Descartes, Pôle de Médecine Interne et Centre National de Référence pour les Vascularites Nécrosantes et la Sclérodermie Systémique, Hôpital Cochin, APHP, Paris
| | - Benjamin Terrier
- Faculté de Médecine, Université Paris Descartes, Pôle de Médecine Interne et Centre National de Référence pour les Vascularites Nécrosantes et la Sclérodermie Systémique, Hôpital Cochin, APHP, Paris
| | - Sophie Rivière
- Service de Médecine Interne, Université Montpellier 1, Maladies Multi-organiques, centre de compétence des maladies systémiques et auto-immunes rares de l'adulte, Hôpital Saint-Eloi, CHRU de Montpellier, Montpellier
| | - Alfred Mahr
- Service de Médecine Interne, Hôpital Saint-Louis, Université Paris 7, APHP, Paris
| | - Christian Pagnoux
- Faculté de Médecine, Université Paris Descartes, Pôle de Médecine Interne et Centre National de Référence pour les Vascularites Nécrosantes et la Sclérodermie Systémique, Hôpital Cochin, APHP, Paris
| | - Denis Bagnères
- Service de médecine interne, hôpital Nord, Assistance publique-Hôpitaux de Marseille, Marseille
| | - Jean-François Cordier
- Service de Pneumologie, Centre de Référence des Maladies Orphelines Pulmonaires, Hôpital Louis Pradel, Université Lyon I, Hospices Civils de Lyon, Lyon and
| | - Alain Le Quellec
- Service de Médecine Interne, Université Montpellier 1, Maladies Multi-organiques, centre de compétence des maladies systémiques et auto-immunes rares de l'adulte, Hôpital Saint-Eloi, CHRU de Montpellier, Montpellier
| | - Romain Altwegg
- Département d'Hépato-Gastroentérologie, Hôpital Saint-Eloi, Université Montpellier 1, CHRU de Montpellier, Montpellier, France
| | - Loïc Guillevin
- Faculté de Médecine, Université Paris Descartes, Pôle de Médecine Interne et Centre National de Référence pour les Vascularites Nécrosantes et la Sclérodermie Systémique, Hôpital Cochin, APHP, Paris
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Joshi L, Tanna A, McAdoo SP, Medjeral-Thomas N, Taylor SR, Sandhu G, Tarzi RM, Pusey CD, Lightman S. Long-term Outcomes of Rituximab Therapy in Ocular Granulomatosis with Polyangiitis. Ophthalmology 2015; 122:1262-8. [DOI: 10.1016/j.ophtha.2015.01.016] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 01/10/2015] [Accepted: 01/17/2015] [Indexed: 12/12/2022] Open
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Rani L, Minz RW, Sharma A, Anand S, Gupta D, Panda N, Sakhuja V. Predominance of PR3 specific immune response and skewed TH17 vs. T-regulatory milieu in active granulomatosis with polyangiitis. Cytokine 2015; 71:261-7. [DOI: 10.1016/j.cyto.2014.10.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 09/24/2014] [Accepted: 10/21/2014] [Indexed: 10/24/2022]
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Granulomatosis with polyangiitis (Wegener granulomatosis) as a differential diagnosis of sternal osteomyelitis: the challenges in diagnosis. J Clin Rheumatol 2014; 19:446-8. [PMID: 24263148 DOI: 10.1097/rhu.0000000000000036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Although granulomatosis with polyangiitis (GPA) can affect a large number of organ systems and produce a broad spectrum of clinical symptoms, skeletal involvement is very rare, with the exception of facial bone involvement associated with destructive nasal and sinus inflammation. We describe here a 54-year-old man with sternal osteomyelitis and destructive arthritis around the sternoclavicular joint. Despite antibiotics and conventional immunosuppressive treatment, his symptoms deteriorated, and a new mass-like lung lesion was developed. A histopathologic analysis of the lung mass revealed chronic granulomatous inflammation with fibrinoid necrosis, and he was diagnosed with GPA. When a patient with a destructive inflammatory lesion has negative culture results and no response to conventional therapy, we propose that an aggressive approach is necessary for a pathologic diagnosis to exclude the possibility of GPA.
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11
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Chen M, Kallenberg CGM. ANCA-associated vasculitides--advances in pathogenesis and treatment. Nat Rev Rheumatol 2010; 6:653-64. [PMID: 20924413 DOI: 10.1038/nrrheum.2010.158] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides (AAV) include Wegener granulomatosis, microscopic polyangiitis, Churg-Strauss syndrome and renal-limited vasculitis. This Review highlights the progress that has been made in our understanding of AAV pathogenesis and discusses new developments in the treatment of these diseases. Evidence from clinical studies, and both in vitro and in vivo experiments, supports a pathogenic role for ANCAs in the development of AAV; evidence is stronger for myeloperoxidase-ANCAs than for proteinase-3-ANCAs. Neutrophils, complement and effector T cells are also involved in AAV pathogenesis. With respect to treatment of AAV, glucocorticoids, cyclophosphamide and other conventional therapies are commonly used to induce remission in generalized disease. Pulse intravenous cyclophosphamide is equivalent in efficacy to oral cyclophosphamide but seems to be associated with less adverse effects. Nevertheless, alternatives to cyclophosphamide therapy have been investigated, such as the use of methotrexate as a less-toxic alternative to cyclophosphamide to induce remission in non-organ-threatening or non-life-threatening AAV. Furthermore, rituximab is equally as effective as cyclophosphamide for induction of remission in AAV and might become the standard of therapy in the near future. Controlled trials in which specific immune effector cells and molecules are being therapeutically targeted have been initiated or are currently being planned.
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Affiliation(s)
- Min Chen
- Renal Division, Peking University First Hospital, Beijing 100034, China
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12
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Hruskova Z, Rihova Z, Mareckova H, Jancova E, Rysava R, Zavada J, Merta M, Löster T, Tesar V. Intracellular cytokine production in ANCA-associated vasculitis: low levels of interleukin-10 in remission are associated with a higher relapse rate in the long-term follow-up. Arch Med Res 2009; 40:276-84. [PMID: 19608017 DOI: 10.1016/j.arcmed.2009.04.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 03/25/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND AND AIMS Dysregulation of cell-mediated immune response likely plays a role in the pathogenesis of anti-neutrophil cytoplasmic autoantibody (ANCA)-associated vasculitis (AAV), but it has not yet been fully established. The aim of this study was to assess the intracellular cytokine production in patients with AAV at different stages of the disease, in particular, in relation to the long-term prognosis. METHODS We included 69 patients with AAV and 24 healthy controls. Using flow cytometry, the following intracellular cytokines (IC) were measured in all patients: interferon-gamma (IFN-gamma), tumor necrosis factor alpha (TNF-alpha), interleukin-2 and interleukin-4 in CD3+T cells and interleukin-10 (IL-10) and interleukin 12 (IL-12) in monocytes. Patients were then prospectively followed for a median of 43 months and cytokine production was related to the long-term prognosis. RESULTS When compared to healthy controls, increased IL-12 production was observed in AAV patients, both active (p<0.01) and in remission (p<0.05). In remission, increased IFN-gamma production was also found (p<0.01). IL-10 production was higher in active patients than in patients in remission (p<0.05) but did not differ from controls. Patients in remission who developed a relapse during follow-up had significantly lower IL-10 production than those without relapse (p<0.01). Results of this prospective study of IC production in AAV confirm findings of previous studies measuring circulating cytokine levels. CONCLUSIONS Activation of the immune system in AAV patients is noticeable even in remission. Patients with AAV display increased IL-12 production, which seems to be counterbalanced by IL-10. Low IL-10 levels in remission are associated with a higher relapse rate in the long-term follow-up.
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Affiliation(s)
- Zdenka Hruskova
- Department of Nephrology, 1st Faculty of Medicine and General Teaching Hospital, Charles University, Prague, Czech Republic.
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13
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Berden AE, Kallenberg CGM, Savage COS, Yard BA, Abdulahad WH, de Heer E, Bruijn JA, Bajema IM. Cellular immunity in Wegener's granulomatosis: characterizing T lymphocytes. ACTA ACUST UNITED AC 2009; 60:1578-87. [PMID: 19479864 DOI: 10.1002/art.24576] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Annelies E Berden
- Leiden University Medical Center, Department of Pathology, University of Leiden, Leiden, The Netherlands.
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14
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Kälsch AI, Peters A, Buhl B, Breedijk A, Prem K, Schmitt WH, Weiss C, Heeringa P, Kallenberg C, Birck R, Yard BA. Retinoid X receptor beta polymorphisms do not explain functional differences in vitamins D and A response in Antineutrophil cytoplasmic antibody associated vasculitis patients. Autoimmunity 2009; 42:467-74. [DOI: 10.1080/08916930902960347] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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GAO YING, ZHAO MINGHUI. Review article: Drug-induced anti-neutrophil cytoplasmic antibody-associated vasculitis. Nephrology (Carlton) 2009; 14:33-41. [DOI: 10.1111/j.1440-1797.2009.01100.x] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Abdulahad WH, Stegeman CA, Limburg PC, Kallenberg CGM. Skewed distribution of Th17 lymphocytes in patients with Wegener's granulomatosis in remission. ACTA ACUST UNITED AC 2008; 58:2196-205. [DOI: 10.1002/art.23557] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Kälsch AI, Soboletzki M, Schmitt WH, van der Woude FJ, Hochhaus A, Yard BA, Birck R. Imatinib mesylate, a new kid on the block for the treatment of anti-neutrophil cytoplasmic autoantibodies-associated vasculitis? Clin Exp Immunol 2008; 151:391-8. [PMID: 18190601 DOI: 10.1111/j.1365-2249.2007.03572.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Persistent T cell activation is a common finding in anti-neutrophil cytoplasmic autoantibodies (ANCA)-associated systemic vasculitis (AAV) patients. Because imatinib, a selective inhibitor of the ABL, ARG, PDGFR and c-KIT tyrosine kinases, inhibits T cell activation, this study was conducted to evaluate the potential use of imatinib for the treatment AAV patients refractory to conventional therapy. In particular, we investigated the inhibition of T cell activation by this drug and its efficacy on activated T cells from anti-neutrophil cytoplasmic autoantibodies (ANCA)-associated systemic vasculitides (AASV) patients. T cell stimulation has been induced by anti-CD3/anti-CD28 antibodies or by phorbol myristate acetate (PMA)/ionomycin. T cell proliferation was analysed by tritiumthymidine incorporation. Cell cycle progression was determined by propidium iodide staining using fluorescence activated cell sorter (FACS) analysis and by RNAse protection assay (RPA). Cytokine levels were assessed by enzyme-linked immunosorbent assay. T cell proliferation was inhibited significantly by imatinib, due most probably to cell cycle arrest in the G1-phase. This was paralleled by inhibition in the expression of cyclin-dependent kinases 1 and 2 mRNA. The expression of CD25 in naive and memory T cells was decreased significantly by imatinib in activated T cells. Similarly, conversion from naive to memory T cells after T cell activation was impaired by imatinib. Imatinib did not influence interleukin-2 and tumour necrosis factor-alpha production but increased interferon-gamma production. These observed effects of imatinib were similar in T cells from AASV patients and from healthy individuals. Imatinib might be an alternative therapeutical option for AASV patients refractory to conventional therapy.
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Affiliation(s)
- A-I Kälsch
- Fifth Medical Department, University Hospital Mannheim, Medical Faculty of Mannheim of the University of Heidelberg, Germany
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Abdulahad WH, Stegeman CA, Limburg PC, Kallenberg CGM. CD4-Positive Effector Memory T Cells Participate in Disease Expression in ANCA-Associated Vasculitis. Ann N Y Acad Sci 2007; 1107:22-31. [PMID: 17804529 DOI: 10.1196/annals.1381.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Although the cause of ANCA-associated vasculitis (AAV) remains undetermined, the presence of lymphocytic infiltrates in inflammatory lesions of patients suggests that vascular damage is immune mediated. Studies over the past decade have implicated a role for T cells in the pathogenesis of AAV as altered T cell phenotype has been observed in this disorder. The distribution of T cell subpopulations has been analyzed most intensely in Wegener's granulomatosis (WG), where an expanded population of circulating CD4(+) effector memory T cells (CD4(+)T(EM)) was demonstrated. CD4(+)T(EM) cells play a major role in the pathogenesis of several autoimmune diseases. Specific suppression of CD4(+)T(EM) cells inhibits delayed-type hypersensitivity (DTH) and has therapeutic potential in autoimmune disease. Thus, CD4(+)T(EM) cells may act as inducers of tissue injury and participate in the development of AAV. Therapies that target CD4(+)T(EM), without impairing the activity of other lymphocyte subsets, may hold therapeutic promise for AAV.
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Affiliation(s)
- Wayel H Abdulahad
- Department of Rheumatology and Clinical Immunology, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, the Netherlands.
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Aries PM, Lamprecht P, Gross WL. Biological therapies: new treatment options for ANCA-associated vasculitis? Expert Opin Biol Ther 2007; 7:521-33. [PMID: 17373903 DOI: 10.1517/14712598.7.4.521] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Biological therapies enable us to apply highly selective targeting components to modulate the immune response. Until now, a few controlled studies investigated the efficacy of TNF-alpha blocking agents in systemic vasculitis have been carried out, but, in general, they were falling short of expectations. However, there is conducive evidence that TNF-alpha blockers are advantageous in antineutrophil cytoplasmic antibodies (ANCA)-associated vasculitis, at least in selected disease stages. Likewise, although the efficacy of the monoclonal CD20 antibody rituximab in ANCA-associated vasculitis is obvious, the effect on predominantly granulomatous disease activity in Wegener's granulomatosis is less clear. In addition, interferon-alpha is used for induction treatment particularly in Churg-Strauss syndrome. Even though the effectiveness and safety of short-term administration was confirmed by case series, severe side effects after long-term treatment relativized the initial results. This review presents the recent data on the use of biologicals in vasculitis and appraises the knowledge in the clinical context.
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MESH Headings
- Antibodies, Antineutrophil Cytoplasmic/adverse effects
- Antibodies, Antineutrophil Cytoplasmic/immunology
- Antibodies, Antineutrophil Cytoplasmic/physiology
- Antibodies, Monoclonal/adverse effects
- Antibodies, Monoclonal/blood
- Antibodies, Monoclonal/therapeutic use
- Antibodies, Monoclonal, Murine-Derived
- Antirheumatic Agents/adverse effects
- Antirheumatic Agents/therapeutic use
- Biological Therapy/methods
- Churg-Strauss Syndrome/drug therapy
- Etanercept
- Granulomatosis with Polyangiitis/drug therapy
- Granulomatosis with Polyangiitis/etiology
- Granulomatosis with Polyangiitis/physiopathology
- Humans
- Immunoglobulin G/adverse effects
- Immunoglobulin G/blood
- Immunoglobulin G/therapeutic use
- Immunologic Factors/therapeutic use
- Infliximab
- Interferon-alpha/therapeutic use
- Randomized Controlled Trials as Topic
- Receptors, Tumor Necrosis Factor/blood
- Receptors, Tumor Necrosis Factor/therapeutic use
- Rituximab
- Tumor Necrosis Factor-alpha/antagonists & inhibitors
- Tumor Necrosis Factor-alpha/blood
- Tumor Necrosis Factor-alpha/immunology
- Vasculitis/drug therapy
- Vasculitis/etiology
- Vasculitis/immunology
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Affiliation(s)
- Peer M Aries
- University Hospital Schleswig-Holstein, Campus Luebeck, Department of Rheumatology and Rheumaklinik Bad Bramstedt, Ratzeburger Allee 160, 23538 Lübeck, Germany.
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20
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Kälsch AI, Schmitt WH, Breedijk A, Marinaki S, Weigerding S, Nebe TC, Nemoto K, van der Woude FJ, Yard BA, Birck R. In vivo effects of cyclic administration of 15-deoxyspergualin on leucocyte function in patients with Wegener's granulomatosis. Clin Exp Immunol 2007; 146:455-62. [PMID: 17100765 PMCID: PMC1810421 DOI: 10.1111/j.1365-2249.2006.03231.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
15-Deoxyspergualin (DSG) is an alternative treatment modality for Wegener's granulomatosis (WG) patients refractory to conventional treatment. Nevertheless, it is unclear how DSG modulates disease activity in these patients. This study was conducted to investigate which parameters of adaptive and acquired immunity were influenced during two subsequent cycles of DSG treatment. Emphasis was put upon T cell and monocyte activation, neutrophil function and surface expression of proteinase-3 (PR-3). Anti-CD3/anti-CD28 and interleukin (IL)-15/IL-7-mediated T cell proliferation were assessed by fluorescence activated cell sorter (FACS) analysis using carboxyfluorescein succinimidyl ester (CSFE) labelling. Interferon (IFN)-gamma and IL-10 production were determined in the supernatants of these cultures by enzyme-linked immunosorbent assay. Monocyte activation was assessed in lipopolysaccharide (LPS)-stimulated whole blood, using tumour necrosis factor (TNF)-alpha as read-out. Neutrophil function was determined by measuring oxidative burst, chemotaxis and phagocytosis. T cell activation markers and PR3 expression were measured by FACS. All parameters were determined directly before and after each DSG cycle. Anti-CD3/anti-CD28-mediated T cell proliferation was reduced directly after DSG treatment. Directly before a subsequent cycle of DSG was started, T cell proliferation was increased. Similar findings were observed for IFN-gamma and IL-10 production by T cells. DSG did not influence IL-15/IL-7-mediated T cell proliferation. LPS-mediated TNF-alpha production was also impaired directly after DSG treatment. No influence on T cell activation markers, neutrophil function and surface PR-3 expression was observed in peripheral blood of these patients. Our data demonstrate that DSG influences T cell and monocyte activation in a reversible fashion. Although DSG causes neutropenia in these patients, it does not influence neutrophil function.
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Affiliation(s)
- A-I Kälsch
- Department of Clinical Chemistry, University Hospital Mannheim, University of Heidelberg, Germany.
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Parambil JG, Keogh KA, Fervenza FC, Ryu JH. Microscopic Polyangiitis Associated With Thymoma, Exacerbating After Thymectomy. Am J Kidney Dis 2006; 48:827-31. [PMID: 17060003 DOI: 10.1053/j.ajkd.2006.07.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Accepted: 07/10/2006] [Indexed: 11/11/2022]
Abstract
A variety of autoimmune diseases has been associated with thymoma, and thymectomy does not always induce remission of these disorders. This case report describes a 50-year-old man who presented with migratory polyarthritis and an anterior mediastinal mass that proved to be a thymoma. Five months after thymectomy, the patient presented with worsening polyarthritis, hematuria, and azotemia. Based on elevated titers of antineutrophil cytoplasmic antibodies directed against myeloperoxidase and renal biopsy showing crescentic necrotizing glomerulonephritis, microscopic polyangiitis was diagnosed. After remission-induction therapy with prednisone and cyclophosphamide, articular symptoms and renal manifestations resolved. Microscopic polyangiitis was not associated previously with thymoma, and this case broadens the spectrum of autoimmune disorders seen with this tumor. Progressive disease seen after thymectomy in this patient has potential implications regarding the pathophysiological characteristics of microscopic polyangiitis and management of patients with this clinical association.
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Affiliation(s)
- Joseph G Parambil
- Division of Pulmonary and Critical Care Medicine, Desk East 18, Mayo Clinic, 200 1st St SW, Rochester, MN 55905, USA
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Abstract
Hewins et al. show that IL-18 is expressed in the kidneys of patients with ANCA-associated glomerulonephritis, and that IL-18 primes neutrophils via p38 MAPK. These findings suggest a role for IL-18, including IL-18-induced T(H)1 polarization and IFN-gamma production, in the progression of ANCA disease.
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Affiliation(s)
- B M Pressler
- Division of Nephrology, Department of Medicine, University of North Carolina, Chapel Hill, North Carolina, USA
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Voswinkel J, Müller A, Lamprecht P. Is PR3-ANCA formation initiated in Wegener's granulomatosis lesions? Granulomas as potential lymphoid tissue maintaining autoantibody production. Ann N Y Acad Sci 2006; 1051:12-9. [PMID: 16126940 DOI: 10.1196/annals.1361.042] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In Wegener's granulomatosis (WG), antiproteinase 3 (PR3) autoantibodies (PR3-ANCA) are crucial in the development of generalized vasculitis. Wegener's pathognomonic lesion, a granulomatous inflammation of the upper and lower respiratory tract, contains abundant lymphocytes and macrophages. Lymphocyte clusters in germinal center-like formation within the granulomatous lesion are frequently observed, which suggests antigen-driven B cell maturation. Wegener's autoantigen PR3, the target for autoreactive B and T cells, is expressed in granulomatous lesions. Disease progression in WG is accompanied by a profound generalized alteration of T cell differentiation with an increase of effector memory T cells (CD4(+)CD28(-)). The cytokine profile suggests an aberrant Th1-type response either to an environmental trigger and/or the autoantigen PR3 itself. Staphylococcus aureus, a risk factor for disease exacerbation, is widely present in the upper airways in WG. The Ig gene repertoire from WG lesions indicates a predominance of VH3+ B cells with affinity to PR3 as well as to the S. aureus B cell superantigen SPA. Hence, within the WG lesion, S. aureus might support the maturation of PR3-affinity B cells that enter a germinal center reaction in contact with PR3 and T cells and expand, leading to PR3-ANCA production. Thus, granulomatous lesions could represent a potential lymphoid tissue-maintaining autoantibody production rather than a simple, random leukocyte accumulation in WG.
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Affiliation(s)
- J Voswinkel
- Department of Rheumatology, University of Lübeck, Lübeck, Germany.
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Zhang J, Alston MA, Huang H, Rabin RL. Human T cell cytokine responses are dependent on multidrug resistance protein-1. Int Immunol 2006; 18:485-93. [PMID: 16481346 DOI: 10.1093/intimm/dxh389] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Multidrug resistance protein-1 (MRP1) belongs to subfamily C of the ATP-binding cassette transporters, and exports leukotriene C(4) and organic anions including the fluorescent calcium indicator indo-1. The observation that leukocytes from patients with an autoimmune disease exported indo-1 at a higher rate than controls prompted the hypothesis that MRP1 contributes to the function of activated cells. To test this, we defined the expression of MRP1 on resting and activated human T cells, and determined whether T cell activation is dependent upon MRP1 function. MRP1 is expressed on resting memory but not on naive CD4 and CD8 T cells. After activation through the TCR, cord blood CD4 T cells express high levels of MRP1. Blockade of MRP1 with the specific inhibitor MK-571 abrogated superantigen-induced expression of IFN-gamma, tumor necrosis factor-alpha, IL-10, IL-2, IL-4 and CD69 by T cells without affecting their viability, and was reversible upon removal of MK-571 from the culture media. Electrophoretic mobility shift assays demonstrate that MRP1 blockade with MK-571 induces activation of the transcriptional repressor peroxisome proliferator-activated receptor-gamma in CD4 T cells, thus providing insight into the potential mechanism by which their responses are abrogated.
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Affiliation(s)
- Jinsong Zhang
- Center for Biologics Evaluation and Research, US Food and Drug Administration, Bethesda, MD 20892-4555, USA
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25
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Lamprecht P. Off balance: T-cells in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides. Clin Exp Immunol 2005; 141:201-10. [PMID: 15996183 PMCID: PMC1809434 DOI: 10.1111/j.1365-2249.2005.02808.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2005] [Indexed: 10/25/2022] Open
Abstract
There is substantial evidence that T-cells are off balance in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides. Genetic risk factors may influence shaping of the TCR repertoire and regulatory control of T-cells in predisposed individuals. T-cells are found in inflammatory lesions. Vigorous Th1-type responses are seen in Wegener's granulomatosis and microscopic angiitis, whereas a Th2-type response predominates in Churg-Strauss syndrome. Oligoclonality and shortened telomers indicate antigen-driven clonal expansion and replicative senescence of T-cells in ANCA-associated vasculitides. Potent CD28(-) Th1-type cells displaying an effector-memory/late differentiated, senescent phenotype are expanded in peripheral blood and are found in granulomatous lesions in Wegener's granulomatosis. Differences in proliferative peripheral blood T-cell responses to the autoantigens proteinase 3 (PR3)- and myeloperoxidase (MPO) have not consistently been detected between patients with ANCA-associated vasculitides and healthy controls in vitro. To recognize an autoantigen, break tolerance, and maintain autoimmune disease T- and B-cells require particular triggers and lymphoid structures. There is preliminary evidence of lymphoid-like structures and possible maturation of autoreactive PR3-ANCA-specific B-cells in granulomatous lesions in Wegener's granulomatosis. Alteration of the T-cell response and anomalous autoantigen-presentation in lymphoid-structures could facilitate development of autoimmune disease in ANCA-associated vasculitides.
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Affiliation(s)
- P Lamprecht
- Department of Rheumatology, University Hospital of Schleswig-Holstein, 23538 Luebeck, Germany.
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Sneller MC. Rituximab and Wegener's granulomatosis: Are B cells a target in vasculitis treatment? ACTA ACUST UNITED AC 2005; 52:1-5. [PMID: 15641069 DOI: 10.1002/art.20717] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Pendergraft WF, Pressler BM, Jennette JC, Falk RJ, Preston GA. Autoantigen complementarity: a new theory implicating complementary proteins as initiators of autoimmune disease. J Mol Med (Berl) 2004; 83:12-25. [PMID: 15592920 DOI: 10.1007/s00109-004-0615-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2004] [Accepted: 10/18/2004] [Indexed: 11/29/2022]
Abstract
Autoimmune diseases affect approximately 1 in 21 persons in the United States. Treatment often requires long-term cytotoxic therapy. How and why these deleterious diseases occur is unclear. A serendipitous finding in our laboratory using serum from patients with autoimmune vasculitis led us to develop the theory of autoantigen complementarity, a novel concept that may elucidate the etiological and pathogenetic mechanisms underlying autoimmune disease in general. The theory proposes that the inciting immunogen that elicits a cascade of immunological events is not the self-antigen (the autoantigen) or its mimic but rather a protein that is complementary in surface structure to the autoantigen; that is, a protein homologous or identical to the amino acid sequence of translated antisense RNA from the noncoding strand of the autoantigen gene. The cascade begins when this complementary protein initiates the production of antibodies that in turn elicit an anti-antibody or anti-idiotypic response. These anti-idiotypic antibodies can now react with the autoantigen. Strikingly, homology search of complementary proteins yields microbial and fungal proteins, thus indicating that invading micro-organisms can deliver the inciting immunogen. Curiously, approximately 50% of our patients transcribe the complementary protein's antisense RNA. If it transpires that these aberrant RNAs are translated, the complementary protein would be produced by the individual. Here we review published research investigating complementary proteins, anti-idiotypic immune responses, and antisense transcripts, all of which support complementary proteins as initiators of autoimmune disease. In addition, we provide possible microbial and/or fungal organisms that may incite some of the most studied autoimmune diseases. Lastly, we propose mechanisms by which cell-mediated autoimmunity can be triggered by autoantigen complementarity. Based on our data and the contributions of the researchers described in this review, identification of proteins complementary to autoantigens is likely to be informative in most autoimmune diseases. This vein of study is in the early phases; however, we expect "autoantigen complementarity" is an underlying mechanism in many autoimmune diseases.
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Affiliation(s)
- William F Pendergraft
- Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7155, USA
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Abstract
Autonomic balance, a function generally under host control, is subject to modulation by other signalers. In some cases, modulation of host autonomic function through behavioral and physical stressors exerted by another individual may have negative consequences for the stress recipient by inducing sympathetic bias. Modulation of autonomic function may sometimes benefit one party at the expense of another. Tumors and HIV are examples of illegitimate signalers who may induce host sympathetic bias to promote their own growth and evade host immune surveillance. Paraneoplastic and paraviral syndromes such as hypertrophic osteoarthopathy, QTc prolongation, insomnia, and cachexia could be viewed as epiphenomena related to the tumoral and viral manipulation of host autonomic balance. In a more general framework, other paraneoplastic and paraviral syndromes may represent epiphenomena related to modulation of endocrine, cytokine, and autonomic functions by tumors and viruses to promote their own survival. Spatial distribution of cancers and viruses within the host may reflect affinity for strategic locations that facilitate manipulation of a variety of host functions including autonomic, endocrine, and cytokine regulation. A more general for understanding spatial distribution of diseases based on gradients of autonomic balance in the body are explored. Darwinian perspectives are discussed.
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Affiliation(s)
- A Joon Yun
- Department of Radiology, Stanford University, 470 University Avenue, Palo Alto, CA 94301, USA.
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