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Abstract
PURPOSE OF REVIEW The aim of this review is to provide insight into the diagnosis and management of patients with refractory coeliac disease (RCD) and highlight recent advances in this field. RECENT FINDINGS The diagnosis of RCD can be more accurately confirmed with flow cytometry in addition to immunohistochemistry. Dietary input and excretion of gluten immunogenic peptides can help rule out gluten contamination, and therefore, substantiate a diagnosis of RCD type I. Small bowel capsule endoscopy (SBCE) is important at diagnosis and follow-up in addition to duodenal histology. Apart from ruling out complications, it can give information on extent of disease in the small bowel, and therefore, help assess response to therapy. Those patients with a poor response can have earlier intensification of therapy, which may result in an improved outcome. RCD also occurs in patients with serology negative coeliac disease but with an increased mortality compared with patients with serology-positive coeliac disease. SUMMARY Patients with RCD can present with persistent symptoms of malnutrition but can also be completely asymptomatic. Serology is not a reliable marker to detect refractory disease. Immunostaining and flow cytometry are necessary for a diagnosis of RCD. Small bowel endoscopy enables disease extent to be assessed and allows for small bowel biopsies to be taken in case of suspicious lesions. Small bowel radiology can be complementary to small bowel endoscopy.
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Chetcuti Zammit S, Sanders DS, Sidhu R. A comprehensive review on the utility of capsule endoscopy in coeliac disease: From computational analysis to the bedside. Comput Biol Med 2018; 102:300-314. [PMID: 29980284 DOI: 10.1016/j.compbiomed.2018.06.025] [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: 04/02/2018] [Revised: 06/23/2018] [Accepted: 06/24/2018] [Indexed: 11/29/2022]
Abstract
Small bowel capsule endoscopy (SBCE) can identify macroscopic changes of coeliac disease and assess the extent of disease in the small bowel beyond the duodenum. SBCE has a good sensitivity for the detection of coeliac disease in comparison to histology owing to several ideal features such as a high magnification. It also plays a useful role in detecting complications in patients with refractory coeliac disease. Several studies have been carried out on transforming images obtained from small bowel capsule endoscopy to enable the automated detection of features related to coeliac disease. This review discusses the current roles played by small bowel capsule endoscopy in coeliac disease. It identifies future potential roles of this technique and describes in great detail the role of computational analysis in the detection of coeliac disease and how it can be adapted to current available technology.
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Affiliation(s)
- Stefania Chetcuti Zammit
- Academic Department of Gastroenterology, Royal Hallamshire Hospital, Sheffield Teaching Hospitals, Sheffield, UK.
| | - David S Sanders
- Academic Department of Gastroenterology, Royal Hallamshire Hospital, Sheffield Teaching Hospitals, Sheffield, UK
| | - Reena Sidhu
- Academic Department of Gastroenterology, Royal Hallamshire Hospital, Sheffield Teaching Hospitals, Sheffield, UK
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Chetcuti Zammit S, Sanders DS, Sidhu R. Capsule endoscopy for patients with coeliac disease. Expert Rev Gastroenterol Hepatol 2018; 12:779-790. [PMID: 29886766 DOI: 10.1080/17474124.2018.1487289] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Coeliac disease is an autoimmune mediated condition in response to gluten. A combination of innate and adaptive immune responses results in villous shortening in the small bowel (SB) that can be morphologically picked up on capsule endoscopy. It is the only imaging modality that can provide mucosal views of the entire SB, while histology is generally limited to the proximal SB. Radiological modalities are not designed to pick up changes in villous morphology. Areas covered: In this review, we provide a comprehensive analysis on the justified use of small bowel capsule endoscopy (SBCE) in the assessment of patients with coeliac disease; compare SBCE to histology, serology, and symptomatology; and provide an overview on automated quantitative analysis for the detection of coeliac disease. We also provide insight into future work on SBCE in relation to coeliac disease. Expert commentary: SBCE has opened up new avenues for the diagnosis and monitoring of patients with coeliac disease. However, larger studies with new and established coeliac disease patients and with greater emphasis on morphological features on SBCE are required to better define the role of SBCE in the setting of coeliac disease.
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Affiliation(s)
| | - David S Sanders
- a Gastroenterology Department , Sheffield Teaching Hospitals , Sheffield , UK
| | - Reena Sidhu
- a Gastroenterology Department , Sheffield Teaching Hospitals , Sheffield , UK
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Woodward J. Improving outcomes of refractory celiac disease - current and emerging treatment strategies. Clin Exp Gastroenterol 2016; 9:225-36. [PMID: 27536154 PMCID: PMC4976763 DOI: 10.2147/ceg.s87200] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Intestinal inflammation and symptoms of celiac disease (CD) usually respond well to gluten withdrawal, but rare cases are refractory to diet. Two types of refractory CD are discriminated on the basis of the presence or absence of an atypical population of mucosal lymphocytes that may progress to enteropathy-associated T-cell lymphoma. Challenges remain in the secure diagnosis of both types of refractory disease, and evidence on which to base treatment recommendations is flawed by the small numbers of reported patients and the use of different diagnostic strategies. Recent advances in our understanding of the mechanisms of the condition in conjunction with the development of immunomodulatory agents for managing other inflammatory diseases are helping to shape future approaches to targeted therapy. Progression will depend on collaboration and recruitment to trials. In the meantime, there is evidence to suggest that earlier diagnosis and better follow-up and management of CD may prevent the development of refractoriness.
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Affiliation(s)
- Jeremy Woodward
- Department of Gastroenterology and Clinical Nutrition, Addenbrooke’s Hospital, Cambridge, UK
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Recognising and Managing Refractory Coeliac Disease: A Tertiary Centre Experience. Nutrients 2015; 7:9896-907. [PMID: 26633478 PMCID: PMC4690058 DOI: 10.3390/nu7125506] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 11/10/2015] [Accepted: 11/16/2015] [Indexed: 12/19/2022] Open
Abstract
Refractory coeliac disease (RCD) is a rare complication of coeliac disease (CD) and involves malabsorption and villous atrophy despite adherence to a strict gluten-free diet (GFD) for at least 12 months in the absence of another cause. RCD is classified based on the T-cells in the intra-epithelial lymphocyte (IEL) morphology into type 1 with normal IEL and type 2 with aberrant IEL (clonal) by PCR (polymerase chain reaction) for T cell receptors (TCR) at the β/γ loci. RCD type 1 is managed with strict nutritional and pharmacological management. RCD type 2 can be complicated by ulcerative jejunitis or enteropathy associated lymphoma (EATL), the latter having a five-year mortality of 50%. Management options for RCD type 2 and response to treatment differs across centres and there have been debates over the best treatment option. Treatment options that have been used include azathioprine and steroids, methotrexate, cyclosporine, campath (an anti CD-52 monoclonal antibody), and cladribine or fluadribine with or without autologous stem cell transplantation. We present a tertiary centre's experience in the treatment of RCD type 2 where treatment with prednisolone and azathioprine was used, and our results show good response with histological recovery in 56.6% of treated individuals.
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Eugster A, Lindner A, Heninger AK, Wilhelm C, Dietz S, Catani M, Ziegler AG, Bonifacio E. Measuring T cell receptor and T cell gene expression diversity in antigen-responsive human CD4+ T cells. J Immunol Methods 2013; 400-401:13-22. [PMID: 24239865 DOI: 10.1016/j.jim.2013.11.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 11/11/2013] [Indexed: 12/25/2022]
Abstract
T cells have diversity in TCR, epitope recognition, and cytokine production, and can be used for immune monitoring. Furthermore, clonal expansion of TCR families in disease may provide opportunities for TCR-directed therapies. We developed methodology for sequencing expressed genes of TCR alpha and beta chains from single cells and applied this to vaccine (tetanus-toxoid)-responsive CD4(+) T cells. TCR alpha and beta chains were both successfully sequenced in 1309 (43%) of 3038 CD4(+) T cells yielding 677 different receptors. TRAV and TRBV gene usage differed between tetanus-toxoid-responsive and non-responsive cells (p=0.004 and 0.0002), and there was extensive TCR diversity in tetanus-toxoid-responsive cells within individuals. Identical TCRs could be recovered in different samples from the same subject: TCRs identified after booster vaccination were frequent in pre-booster memory T cells (31% of pre-booster TCR), and also identified in pre-booster vaccination naïve cells (6.5%). No TCR was shared between subjects, but tetanus toxoid-responsive cells sharing one of their TCR chains were observed within and between subjects. Coupling single-cell gene expression profiling to TCR sequencing revealed examples of distinct cytokine profiles in cells bearing identical TCR. Novel molecular methodology demonstrates extensive diversity of Ag-responsive CD4(+) T cells within and between individuals.
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Affiliation(s)
- Anne Eugster
- DFG Research Center for Regenerative Therapies Dresden, Technische Universität Dresden, Germany; Paul Langerhans Institute Dresden, German Center for Diabetes Research (DZD).
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Pennesi G, Morellini M, Lulli P, Cappellacci S, Brioli G, Franceschi C, Trabace S. TCR Vβ repertoire in an Italian longeval population including centenarians. J Am Aging Assoc 2013; 24:63-70. [PMID: 23604877 DOI: 10.1007/s11357-001-0009-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
During the last years, the hypothesis that aging and diseases are two distinct phenomena, and that successful aging is possible for most humans, has been put forward. We studied the TCR Vβ repertoire of T lymphocytes of healthy longevals and centenarians as crossing point of genetic predisposition and environmental effects to longevity, using the Spectra-typing method. TCR Vβ1, Vβ8, and Vβ20 were found to be expanded in the longeval population, compared with the younger control population. This repertoire can have been shaped by the selective action of particular HLA alleles, or by the clonal expansion of specific T cell clones, able to modulate the immune response to endogenous and exogenous antigens. Moreover, the skewed Vβ usage and the clonal expansion seem to be the effects of physiological changes occurring with aging and not pathological signs of malignity.
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Affiliation(s)
- G Pennesi
- Department of Experimental Medicine and Pathology, Section of Genetics, University of Rome "La Sapienza", c/o L. Spallanzani Hospital, Via Portuense 292, 00128 Rome, Italy ; NEI/NIH, 10 Center Drive, Building 10, Room 10N218, Bethesda, MD 20892
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8
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Abstract
A significant proportion of patients with coeliac disease are 'nonresponsive' to gluten withdrawal. Most cases of nonresponsive coeliac disease are due to persisting gluten ingestion. Refractory coeliac disease (RCD) is currently defined by persistent symptoms and signs of malabsorption after gluten exclusion for 12 months with ongoing intestinal villous atrophy. Primary (without initial response to diet) and secondary (relapse following response to diet) RCD is recognized. RCD is further classified as type I or type II based on the absence or presence of a population of aberrant intestinal lymphocytes. Quality of dietetic advice and support is fundamental, and lack of objective corroboration of gluten exclusion may result in over-identification of RCD I, particularly in those cases with persisting antibody responses. Over-reliance on lymphocyte clonality similarly may result in over-diagnosis of RCD II which requires careful quantification of aberrant lymphocyte populations. Management of RCD should be undertaken in specialist centres. It requires initial intensive dietary supervision, strict gluten exclusion and subsequent re-evaluation. There is currently insufficient evidence to recommend specific treatments. Steroids are often used in both RCD I and II (albeit with little objective evidence of benefit in RCD II), and azathioprine as steroid-sparing therapy in RCD I. There is growing evidence for the use of cladribine in RCD II with autologous stem cell transplantation in nonresponders, but this requires further multicentre evaluation. There remains considerable controversy regarding the diagnosis, treatment and surveillance of RCD: international consensus in these areas is urgently required to facilitate future therapeutic advances.
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Affiliation(s)
- Jeremy Woodward
- Consultant Gastroenterologist, Addenbrooke's Hospital, Cambridge CB2 0QQ, UK
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9
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Miles JJ, Douek DC, Price DA. Bias in the αβ T-cell repertoire: implications for disease pathogenesis and vaccination. Immunol Cell Biol 2011; 89:375-87. [PMID: 21301479 DOI: 10.1038/icb.2010.139] [Citation(s) in RCA: 167] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The naïve T-cell repertoire is vast, containing millions of unique T-cell receptor (TCR) structures. Faced with such diversity, the mobilization of TCR structures from this enormous pool was once thought to be a stochastic, even chaotic, process. However, steady and systematic dissection over the last 20 years has revealed that this is not the case. Instead, the TCR repertoire deployed against individual antigens is routinely ordered and biased. Often, identical and near-identical TCR repertoires can be observed across different individuals, suggesting that the system encompasses an element of predictability. This review provides a catalog of αβ TCR bias by disease and by species, and discusses the mechanisms that govern this inherent and widespread phenomenon.
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Affiliation(s)
- John J Miles
- T Cell Modulation Laboratory, Department of Infection, Immunity and Biochemistry, Cardiff University School of Medicine, Cardiff, UK.
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Zuleger CL, Macklin MD, Bostwick BL, Pei Q, Newton MA, Albertini MR. In vivo 6-thioguanine-resistant T cells from melanoma patients have public TCR and share TCR beta amino acid sequences with melanoma-reactive T cells. J Immunol Methods 2010; 365:76-86. [PMID: 21182840 DOI: 10.1016/j.jim.2010.12.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2010] [Revised: 12/01/2010] [Accepted: 12/13/2010] [Indexed: 10/18/2022]
Abstract
In vivo hypoxanthine-guanine phosphoribosyltransferase (HPRT)-deficient T cells (MT) from melanoma patients are enriched for T cells with in vivo clonal amplifications that traffic between blood and tumor tissues. Melanoma is thus a model cancer to test the hypothesis that in vivo MT from cancer patients can be used as immunological probes for immunogenic tumor antigens. MT were obtained by 6-thioguanine (TG) selection of lymphocytes from peripheral blood and tumor tissues, and wild-type T cells (WT) were obtained analogously without TG selection. cDNA sequences of the T cell receptor beta chains (TRB) were used as unambiguous biomarkers of in vivo clonality and as indicators of T cell specificity. Public TRB were identified in MT from the blood and tumor of different melanoma patients. Such public TRB were not found in normal control MT or WT. As an indicator of T cell specificity for melanoma, the >2600 MT and WT TRB, including the public TRB from melanoma patients, were compared to a literature-derived empirical database of >1270 TRB from melanoma-reactive T cells. Various degrees of similarity, ranging from 100% conservation to 3-amino acid motifs (3-mer), were found between both melanoma patient MT and WT TRBs and the empirical database. The frequency of 3-mer and 4-mer TRB matching to the empirical database was significantly higher in MT compared with WT in the tumor (p=0.0285 and p=0.006, respectively). In summary, in vivo MT from melanoma patients contain public TRB as well as T cells with specificity for characterized melanoma antigens. We conclude that in vivo MT merit study as novel probes for uncharacterized immunogenic antigens in melanoma and other malignancies.
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Bonomi G, Moschella F, Ombra MN, Del Pozzo G, Granier C, De Berardinis P, Guardiola J. Modulation of TCR recognition of MHC class II/peptide by processed remote N- and C-terminal epitope extensions. Hum Immunol 2000; 61:753-63. [PMID: 10980386 DOI: 10.1016/s0198-8859(00)00147-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
N- and C-terminal extensions of naturally processed MHC class II-bound peptides may affect TCR recognition. In fact, residues immediately flanking the minimal epitope on either side can contact the MHC groove and modify the interaction with a TCR. We report now that residues much farther away from the peptide core can also modulate TCR recognition in a functional antigen presentation system. To show this, we isolated from the same donor DR5-restricted T cell clones, specific for the HIV-1 RT(248-262) sequence and differing in their ability to respond to recombinant antigens obtained by insertion of the epitope in different positions of schistosomal, human, or murine glutathione-S-transferase (GST). We found that the reactivity profile of individual clones was related to their TCR fine specificity, suggesting that processing can generate determinants focused onto the same epitope, but antigenically distinct. In addition, we analyzed the response of this panel of T-helper cell clones against GST-derived recombinant antigens in which the epitope was flanked by stretches of polyalanine or polyserine on either side. These spacers had different effects on TCR recognition suggesting that secondary structures outside the core peptide may influence MHC/epitope complex recognition over a distance of 15-30 residues from the determinant.
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Affiliation(s)
- G Bonomi
- International Institute of Genetics and Biophysics, CNR, Naples, Italy.
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12
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Prisco A, Bonomi G, Moschella F, Ombra MN, De Berardinis P, Guardiola J. In vitro immunization with a recombinant antigen carrying the HIV-1 RT248-262 determinant inserted at different locations results in altered TCRVB region usage. Hum Immunol 1999; 60:755-63. [PMID: 10527382 DOI: 10.1016/s0198-8859(99)00055-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Immunodominance or cripticity of a peptide-borne determinant may be influenced by the protein context in which the epitope is embedded. In this frame, we previously showed that certain human T cell clones, derived from different donors, may differentially recognize the RT248-262 helper determinant depending on whether it is provided to the presenting cells as a synthetic peptide or as a recombinant carrier protein to which the sequence of interest is fused. We now report that, upon in vitro immunization of human PBL with autologous APC, the epitope-specific TCRVB repertoire obtained when selection is applied by pulsing the APC with the cognate synthetic peptide is different from that found when a recombinant protein is used in which the antigenic sequence is placed at either a N-terminal or C-terminal location of the GST carrier. As the TCRVB distribution is not a function of the APC used, we propose that processing of different recombinant molecules containing the same epitope may generate MHC/peptide complexes which, being antigenically diverse, may recruit distinct TCR specificities. These findings may be relevant for evaluating and predicting the immunogenic potential of subunit vaccines based on synthetic peptides or on recombinant proteins as compared to the native antigen.
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Affiliation(s)
- A Prisco
- International Institute of Genetics and Biophysics, Naples, Italy
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Dulphy N, Peyrat MA, Tieng V, Douay C, Rabian C, Tamouza R, Laoussadi S, Berenbaum F, Chabot A, Bonneville M, Charron D, Toubert A. Common Intra-Articular T Cell Expansions in Patients with Reactive Arthritis: Identical β-Chain Junctional Sequences and Cytotoxicity Toward HLA-B27. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.7.3830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Spondyloarthropathies constitute a group of autoimmune diseases of special interest because of their tight association with the MHC class I molecule HLA-B27 and the bacterial triggering of some clinical forms called reactive arthritis (ReA). One current hypothesis is the presentation by HLA-B27 of a so-called arthritogenic peptide to T cells. To better focus on the relevant T cell populations within the joint, we performed an extensive β-chain T cell repertoire analysis of synovial fluid compared with PBL in seven patients, four of whom were characterized as having ReA triggered by Yersinia enterocolitica, Chlamydia trachomatis, or Shigella sonnei. Analysis of the size diversity of the β-chain complementarity-determining region 3 (CDR3) allowed us to evaluate the degree of T cell clonality in the samples. Oligoclonal T cell expansions were frequently observed in the joint. In one patient, CDR3 amino acid sequences of major expansions using two different BV genes were identical. One dominant T cell expansion and several CDR3 amino acid sequences were identical in two different patients. Furthermore, one sequence was identical with a sequence reported independently in a Salmonella-induced ReA patient. Together, these data indicate a surprisingly high degree of conservation in the T cell responses in recent-onset ReA triggered by different micro-organisms. A CD8+ synovial line expressing shared clonotypes was established and reacted toward several B*2705 lymphoblastoid cell lines, therefore supporting a molecular mimicry phenomenon at the T cell level in the disease mechanism.
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Affiliation(s)
- Nicolas Dulphy
- *Laboratoire d’Immunologie et d’Histocompatibilité, Institut National de la Santé et de la Recherche Médicale, Unit 396, Université Paris VII, Centre G. Hayem, Hôpital Saint-Louis, Paris, France
| | - Marie-Alix Peyrat
- †Institut National de la Santé et de la Recherche Médicale, Unit 463, Institut de Biologie, Nantes, France
| | - Vannary Tieng
- *Laboratoire d’Immunologie et d’Histocompatibilité, Institut National de la Santé et de la Recherche Médicale, Unit 396, Université Paris VII, Centre G. Hayem, Hôpital Saint-Louis, Paris, France
| | - Corinne Douay
- *Laboratoire d’Immunologie et d’Histocompatibilité, Institut National de la Santé et de la Recherche Médicale, Unit 396, Université Paris VII, Centre G. Hayem, Hôpital Saint-Louis, Paris, France
| | - Claire Rabian
- *Laboratoire d’Immunologie et d’Histocompatibilité, Institut National de la Santé et de la Recherche Médicale, Unit 396, Université Paris VII, Centre G. Hayem, Hôpital Saint-Louis, Paris, France
| | - Ryad Tamouza
- *Laboratoire d’Immunologie et d’Histocompatibilité, Institut National de la Santé et de la Recherche Médicale, Unit 396, Université Paris VII, Centre G. Hayem, Hôpital Saint-Louis, Paris, France
| | | | - Francis Berenbaum
- §Service de Rhumatologie, Hôpital Saint-Antoine, Paris, France; and
| | - Agnes Chabot
- ¶Service de Rhumatologie A, Hôpital Lariboisière, Paris, France
| | - Marc Bonneville
- †Institut National de la Santé et de la Recherche Médicale, Unit 463, Institut de Biologie, Nantes, France
| | - Dominique Charron
- *Laboratoire d’Immunologie et d’Histocompatibilité, Institut National de la Santé et de la Recherche Médicale, Unit 396, Université Paris VII, Centre G. Hayem, Hôpital Saint-Louis, Paris, France
| | - Antoine Toubert
- *Laboratoire d’Immunologie et d’Histocompatibilité, Institut National de la Santé et de la Recherche Médicale, Unit 396, Université Paris VII, Centre G. Hayem, Hôpital Saint-Louis, Paris, France
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Liossis SN, Tsokos GC. Cellular immunity in osteoarthritis: novel concepts for an old disease. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 1998; 5:427-9. [PMID: 9665943 PMCID: PMC95594 DOI: 10.1128/cdli.5.4.427-429.1998] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- S N Liossis
- Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814, USA
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