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Gu CJ, Ding MD, Zhou DM, Li J, Yu WQ, Yang YL. Non-O1, Non-O139 Vibrio cholerae Bacteremia in an Autoimmune Pancreatitis Patient. Case Rep Infect Dis 2024; 2024:7219952. [PMID: 38737750 PMCID: PMC11087146 DOI: 10.1155/2024/7219952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 04/20/2024] [Accepted: 04/25/2024] [Indexed: 05/14/2024] Open
Abstract
Over 200 different serogroups of Vibrio cholerae based on O-polysaccharide specificity have been described worldwide, including the two most important serogroups, O1 and O139. Non-O1/non-O139 V. cholerae serogroups generally do not produce the cholera-causing toxin but do sporadically cause gastroenteritis and extra-intestinal infections. Recently, however, bloodstream infections caused by non-O1/non-O139 V. cholerae are being increasingly reported, and these infections are associated with high mortality in immunocompromised hosts. We describe a case of non-O1/non-O139 V. cholerae bacteremia in a patient with autoimmune pancreatitis and stenosis of the intra- and extrahepatic bile ducts. The clinical manifestations of bacteremia were fever and mild digestive symptoms. The blood cultures showed V. cholerae, which was identified as a non-O1, non-O139 serogroup by slide agglutination tests and PCR. The bloodstream infection of the patient was likely caused by the consumption of contaminated seafood at a banquet. The patient recovered after the administration of a third-generation cephalosporin. Non-O1/non-O139 V. cholerae infection presents with or without gastrointestinal manifestations; close attention should be paid to the possibility of disseminated non-O1/non-O139 V. cholerae infection in high-risk patients.
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Affiliation(s)
- Cheng-Jing Gu
- Department of Pharmacy, Taizhou People's Hospital Affiliated to Nanjing Medical University, The Fifth Affiliated Hospital of Nantong University, Jiangsu 225300, China
| | - Ming-Dong Ding
- Department of Infectious Diseases, Taizhou People's Hospital Affiliated to Nanjing Medical University, The Fifth Affiliated Hospital of Nantong University, Nantong, Jiangsu 225300, China
| | - Da-Ming Zhou
- Department of Infectious Diseases, Taizhou People's Hospital Affiliated to Nanjing Medical University, The Fifth Affiliated Hospital of Nantong University, Nantong, Jiangsu 225300, China
| | - Jie Li
- Department of Gastroenterology, Taizhou People's Hospital Affiliated to Nanjing Medical University, The Fifth Affiliated Hospital of Nantong University, Nantong, Jiangsu 225300, China
| | - Wen-Qing Yu
- Department of Infectious Diseases, Taizhou People's Hospital Affiliated to Nanjing Medical University, The Fifth Affiliated Hospital of Nantong University, Nantong, Jiangsu 225300, China
| | - Yong-Lin Yang
- Department of Infectious Diseases, Taizhou People's Hospital Affiliated to Nanjing Medical University, The Fifth Affiliated Hospital of Nantong University, Nantong, Jiangsu 225300, China
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Motta RV, Culver EL. IgG4 autoantibodies and autoantigens in the context of IgG4-autoimmune disease and IgG4-related disease. Front Immunol 2024; 15:1272084. [PMID: 38433835 PMCID: PMC10904653 DOI: 10.3389/fimmu.2024.1272084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 01/25/2024] [Indexed: 03/05/2024] Open
Abstract
Immunoglobulins are an essential part of the humoral immune response. IgG4 antibodies are the least prevalent subclass and have unique structural and functional properties. In this review, we discuss IgG4 class switch and B cell production. We review the importance of IgG4 antibodies in the context of allergic responses, helminth infections and malignancy. We discuss their anti-inflammatory and tolerogenic effects in allergen-specific immunotherapy, and ability to evade the immune system in parasitic infection and tumour cells. We then focus on the role of IgG4 autoantibodies and autoantigens in IgG4-autoimmune diseases and IgG4-related disease, highlighting important parallels and differences between them. In IgG4-autoimmune diseases, pathogenesis is based on a direct role of IgG4 antibodies binding to self-antigens and disturbing homeostasis. In IgG4-related disease, where affected organs are infiltrated with IgG4-expressing plasma cells, IgG4 antibodies may also directly target a number of self-antigens or be overexpressed as an epiphenomenon of the disease. These antigen-driven processes require critical T and B cell interaction. Lastly, we explore the current gaps in our knowledge and how these may be addressed.
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Affiliation(s)
- Rodrigo V. Motta
- Translational Gastroenterology and Liver Unit, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Emma L. Culver
- Translational Gastroenterology and Liver Unit, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
- Department of Gastroenterology and Hepatology, Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom
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3
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Li Z, Zhang Y, Mi C, Deng X, Wang X, Hu D, Yin K, Yin C, Zhao L, Shan B. Identification of the immunogenic membrane proteins, catalase, PgbA, and PgbB, as potential antigens against Helicobacter pylori. J Appl Microbiol 2023; 134:lxad218. [PMID: 37777837 DOI: 10.1093/jambio/lxad218] [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: 08/20/2022] [Revised: 08/24/2023] [Accepted: 09/29/2023] [Indexed: 10/02/2023]
Abstract
AIMS This study aims to investigate the specific membrane antigens that are targeted by antibodies raised against Helicobacter pylori. METHODS AND RESULTS Bovine milk antibodies were prepared using whole H. pylori, purified membrane proteins, or both. Enzyme-linked immunosorbent assay and sodium dodecyl sulfate-polyacrylamide gel electrophoresis experiments revealed that these immunogens triggered anti-H. pylori antibody production in milk. The highest antibody titer was induced by the mixture of whole bacteria and purified membrane proteins. The antibodies induced by mixed immunogens significantly inhibited H. pylori growth in vitro and were used to identify catalase, plasminogen-binding protein A (PgbA), and PgbB via western blotting, immunoprecipitation, and two-dimensional western blotting followed by liquid chromatography with tandem mass spectrophotometry. The immunogenicity of PgbA and PgbB was verified in mice vaccinated with their B-cell epitope vaccines. Following prophylactic vaccination of C57BL/6 mice, each of the three antigens alone and their combination reduced the weight loss in mice, increased antibody titers, and relieved the inflammatory status of the gastric mucosa following H. pylori infection. CONCLUSIONS Catalase, PgbA, and PgbB could serve as valuable membrane antigens for the development of anti-H. pylori immunotherapies.
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Affiliation(s)
- Zhirong Li
- Research Center, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, China
- Provincial Center for Clinical Laboratories, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, China
| | - Ying Zhang
- Research Center, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, China
| | - Chaoyi Mi
- Research Center, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, China
| | - Xiaoqing Deng
- Research Center, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, China
| | - Xian Wang
- Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang, Hebei 050000, China
| | - Dailun Hu
- Clinical College, Hebei Medical University, Shijiazhuang, Hebei 050020, China
| | - Kaige Yin
- Department of Gastroenterology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, China
| | - Changfu Yin
- Clinical College, Hebei Medical University, Shijiazhuang, Hebei 050020, China
| | - Lianmei Zhao
- Research Center, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, China
| | - Baoen Shan
- Research Center, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, China
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4
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Lanzillotta M, Stone JH, Della-Torre E. B-Cell depletion therapy in IgG4-related disease: State of the art and future perspectives. Mod Rheumatol 2023; 33:258-265. [PMID: 35983918 DOI: 10.1093/mr/roac098] [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: 07/20/2022] [Revised: 08/13/2022] [Accepted: 08/15/2022] [Indexed: 11/13/2022]
Abstract
IgG4-related disease (IgG4-RD) is an increasingly recognized immune-mediated fibroinflammatory disorder that promptly responds to glucocorticoids but commonly relapses during steroid tapering or after discontinuation. In the last few years, B-cell depletion therapy with rituximab (RTX) proved to be effective in the induction of remission and maintenance treatment of IgG4-RD, providing a new powerful tool in the management of this emerging condition. In this review, we outline the pathogenetic rationale for using B-cell depleting agents in IgG4-RD, we summarize available clinical experience with RTX in this disease, and we describe future possible therapies targeting B-lymphocytes that are now in the pipeline.
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Affiliation(s)
- Marco Lanzillotta
- IRCCS San Raffaele Scientific Institute, Università Vita-Salute San Raffaele, Milan, Italy.,Unit of Immunology, Rheumatology, Allergy and Rare Diseases, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - John H Stone
- Rheumatology Unit, Massachusetts General Hospital, Boston, MA, USA
| | - Emanuel Della-Torre
- IRCCS San Raffaele Scientific Institute, Università Vita-Salute San Raffaele, Milan, Italy.,Unit of Immunology, Rheumatology, Allergy and Rare Diseases, IRCCS San Raffaele Scientific Institute, Milan, Italy
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5
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The Clinical Utility of Soluble Serum Biomarkers in Autoimmune Pancreatitis: A Systematic Review. Biomedicines 2022; 10:biomedicines10071511. [PMID: 35884816 PMCID: PMC9312496 DOI: 10.3390/biomedicines10071511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/17/2022] [Accepted: 06/21/2022] [Indexed: 11/17/2022] Open
Abstract
Autoimmune pancreatitis (AIP) is a rare etiological type of chronic pancreatitis. The clinical and radiological presentation of AIP often resembles that of pancreatic cancer. Identifying non-invasive markers for their early distinction is of utmost importance to avoid unnecessary surgery or a delay in steroid therapy. Thus, this systematic review was conducted to revisit all current evidence on the clinical utility of different serum biomarkers in diagnosing AIP, distinguishing AIP from pancreatic cancer, and predicting disease course, steroid therapy response, and relapse. A systematic review was performed for articles published up to August 2021 by searching electronic databases such as MEDLINE, Web of Science, and EMBASE. Among 5123 identified records, 92 studies were included in the qualitative synthesis. Apart from immunoglobulin (Ig) G4, which was by far the most studied biomarker, we identified autoantibodies against the following: lactoferrin, carboanhydrase II, plasminogen-binding protein, amylase-α2A, cationic (PRSS1) and anionic (PRSS2) trypsinogens, pancreatic secretory trypsin inhibitor (PSTI/SPINK1), and type IV collagen. The identified novel autoantigens were laminin 511, annexin A11, HSP-10, and prohibitin. Other biomarkers included cytokines, decreased complement levels, circulating immune complexes, N-glycan profile changes, aberrant miRNAs expression, decreased IgA and IgM levels, increased IgE levels and/or peripheral eosinophil count, and changes in apolipoprotein isoforms levels. To our knowledge, this is the first systematic review that addresses biomarkers in AIP. Evolving research has recognized numerous biomarkers that could help elucidate the pathophysiological mechanisms of AIP, bringing us closer to AIP diagnosis and its preoperative distinction from pancreatic cancer.
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Abstract
IgG4-related conditions affecting the digestive tract are part of a multi-organ fibro-inflammatory disorder termed IgG4-related disease (IgG4-RD), with autoimmune pancreatitis and IgG4-related cholangitis being the most prominent manifestations. Gastrointestinal symptoms include jaundice, weight loss, abdominal pain, biliary strictures, and pancreatic and hepatic masses that mimic malignant diseases. IgG4-RD manifestations occur less frequently elsewhere in the digestive tract, namely in the oesophagus, retroperitoneum or intestine. Evidence-based European guidelines frame the current state-of-the-art in the diagnosis and management of IgG4-related digestive tract disease. Diagnosis is based on histology (if available), imaging, serology, other organ involvement and response to therapy (HISORt criteria). Few biomarkers beyond serum IgG4 concentrations are reliable. The first-line therapy (glucocorticoids) is swiftly effective but disease flares are common at low doses or after tapering. Second-line therapy might consist of other immunosuppressive drugs such as thiopurines or rituximab. Further trials, for example, of anti-CD19 drugs, are ongoing. Although an association between IgG4-RD and the development of malignancies has been postulated, the true nature of this relationship remains uncertain at this time.
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Notohara K. Histological features of autoimmune pancreatitis and IgG4-related sclerosing cholangitis with a correlation with imaging findings. J Med Ultrason (2001) 2021; 48:581-594. [PMID: 34669070 DOI: 10.1007/s10396-021-01148-5] [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: 07/06/2021] [Accepted: 09/03/2021] [Indexed: 12/12/2022]
Abstract
Autoimmune pancreatitis (AIP) is characterized by a tumefactive inflammatory lesion resembling pancreatic carcinoma. Type 1 AIP is a pancreatic manifestation of IgG4-related disease characterized by unique histological features that can be identified on imaging. The capsule-like rim, which is a collar of hypertrophic lesion surrounding the pancreas, consists of lymphoplasmacytic infiltration and fibrosis, and storiform fibrosis is often identified. Hypertrophic lesions of various microscopic architectures such as the ducts, veins (obliterative phlebitis), arteries (periarteritis), and nerves are observed without parenchymal damage. The pancreatic lobules keep their contours, but the acinar cells are diminished and replaced by numerous inflammatory cells. These features provide clues to arrive at a diagnosis of type 1 AIP and to distinguish it from pancreatic carcinoma on imaging. In contrast, type 2 AIP is an epithelium-centered inflammation involving the ducts and lobules. Neutrophilic infiltration in the epithelium and/or lumens (granulocytic epithelial lesion) is a characteristic finding. Lobular swelling due to inflammation is the cause of pancreatic enlargement. IgG4-related sclerosing cholangitis is histologically similar to the hypertrophic ductal lesion in type 1 AIP and characterized by wall thickening due to inflammation and luminal stenosis. The epithelium is intact, which is different from bile duct carcinomas and primary sclerosing cholangitis, the latter of which is characterized by inflammation targeting the epithelium. Although the histological features of type 1 AIP and IgG4-related sclerosing cholangitis are unique, the biopsy diagnosis of these diseases has limitations, which should be recognized by clinicians.
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Affiliation(s)
- Kenji Notohara
- Department of Anatomic Pathology, Kurashiki Central Hospital, 1-1-1 Miwa, Kurashiki, 710-8602, Japan.
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8
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Liu J, Yin W, Westerberg LS, Lee P, Gong Q, Chen Y, Dong L, Liu C. Immune Dysregulation in IgG 4-Related Disease. Front Immunol 2021; 12:738540. [PMID: 34539675 PMCID: PMC8440903 DOI: 10.3389/fimmu.2021.738540] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 08/09/2021] [Indexed: 12/26/2022] Open
Abstract
Immunoglobin G4-related disease (IgG4-RD) is one of the newly discovered autoimmune diseases characterized by elevated serum IgG4 concentrations and multi-organ fibrosis. Despite considerable research and recent advances in the identification of underlying immunological processes, the etiology of this disease is still not clear. Adaptive immune cells, including different types of T and B cells, and cytokines secreted by these cells play a vital role in the pathogenesis of IgG4-RD. Antigen-presenting cells are stimulated by pathogens and, thus, contribute to the activation of naïve T cells and differentiation of different T cell subtypes, including helper T cells (Th1 and Th2), regulatory T cells, and T follicular helper cells. B cells are activated and transformed to plasma cells by T cell-secreted cytokines. Moreover, macrophages, and some important factors (TGF-β, etc.) promote target organ fibrosis. Understanding the role of these cells and cytokines implicated in the pathogenesis of IgG4-RD will aid in developing strategies for future disease treatment and drug development. Here, we review the most recent insights on IgG4-RD, focusing on immune dysregulation involved in the pathogenesis of this autoimmune condition.
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Affiliation(s)
- Jiachen Liu
- Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei Yin
- Wuhan Children's Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lisa S Westerberg
- Department of Microbiology Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Pamela Lee
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Quan Gong
- Department of Immunology, School of Medicine, Yangtze University, Jingzhou, China
| | - Yan Chen
- The Second Department of Pediatrics, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Lingli Dong
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chaohong Liu
- Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Kunovsky L, Dite P, Jabandziev P, Dolina J, Vaculova J, Blaho M, Bojkova M, Dvorackova J, Uvirova M, Kala Z, Trna J. Helicobacter pylori infection and other bacteria in pancreatic cancer and autoimmune pancreatitis. World J Gastrointest Oncol 2021; 13:835-844. [PMID: 34457189 PMCID: PMC8371525 DOI: 10.4251/wjgo.v13.i8.835] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 03/24/2021] [Accepted: 07/05/2021] [Indexed: 02/06/2023] Open
Abstract
Helicobacter pylori (H. pylori) is an infectious agent influencing as much as 50% of the world’s population. It is the causative agent for several diseases, most especially gastric and duodenal peptic ulcer, gastric adenocarcinoma and mucosa-associated lymphoid tissue lymphoma of the stomach. A number of other, extragastric manifestations also are associated with H. pylori infection. These include neurological disorders, such as Alzheimer’s disease, demyelinating multiple sclerosis and Parkinson’s disease. There is also evidence for a relationship between H. pylori infection and such dermatological diseases as psoriasis and rosacea as well as a connection with infection and open-angle glaucoma. Generally little is known about the relationship between H. pylori infection and diseases of the pancreas. Most evidence about H. pylori and its potential role in the development of pancreatic diseases concerns pancreatic adenocarcinoma and autoimmune forms of chronic pancreatitis. There is data (albeit not fully consistent) indicating modestly increased pancreatic cancer risk in H. pylori-positive patients. The pathogenetic mechanism of this increase is not yet fully elucidated, but several theories have been proposed. Reduction of antral D-cells in H. pylori-positive patients causes a suppression of somatostatin secretion that, in turn, stimulates increased secretin secretion. That stimulates pancreatic growth and thus increases the risk of carcinogenesis. Alternatively, H. pylori, as a part of microbiome dysbiosis and the so-called oncobiome, is proven to be associated with pancreatic adenocarcinoma development via the promotion of cellular proliferation. The role of H. pylori in the inflammation characteristic of autoimmune pancreatitis seems to be explained by a mechanism of molecular mimicry among several proteins (mostly enzymes) of H. pylori and pancreatic tissue. Patients with autoimmune pancreatitis often show positivity for antibodies against H. pylori proteins. H. pylori, as a part of microbiome dysbiosis, also is viewed as a potential trigger of autoimmune inflammation of the pancreas. It is precisely these relationships (and associated equivocal conclusions) that constitute a center of attention among pancreatologists, immunologists and pathologists. In order to obtain clear and valid results, more studies on sufficiently large cohorts of patients are needed. The topic is itself sufficiently significant to draw the interest of clinicians and inspire further systematic research. Next-generation sequencing could play an important role in investigating the microbiome as a potential diagnostic and prognostic biomarker for pancreatic cancer.
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Affiliation(s)
- Lumir Kunovsky
- Department of Surgery, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno 62500, Czech Republic
- Department of Gastroenterology and Internal Medicine, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno 62500, Czech Republic
| | - Petr Dite
- Department of Gastroenterology and Internal Medicine, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno 62500, Czech Republic
- Department of Gastroenterology and Internal Medicine, University Hospital Ostrava, Ostrava 70800, Czech Republic
- Faculty of Medicine, University of Ostrava, Ostrava 70300, Czech Republic
| | - Petr Jabandziev
- Department of Pediatrics, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno 61300, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno 62500, Czech Republic
| | - Jiri Dolina
- Department of Gastroenterology and Internal Medicine, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno 62500, Czech Republic
| | - Jitka Vaculova
- Department of Gastroenterology and Internal Medicine, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno 62500, Czech Republic
| | - Martin Blaho
- Department of Gastroenterology and Internal Medicine, University Hospital Ostrava, Ostrava 70800, Czech Republic
- Faculty of Medicine, University of Ostrava, Ostrava 70300, Czech Republic
| | - Martina Bojkova
- Department of Gastroenterology and Internal Medicine, University Hospital Ostrava, Ostrava 70800, Czech Republic
- Faculty of Medicine, University of Ostrava, Ostrava 70300, Czech Republic
| | - Jana Dvorackova
- Department of Intensive Medicine, Emergency Medicine and Forensic Studies, University Hospital Ostrava, Ostrava 70800, Czech Republic
- Faculty of Medicine, University of Ostrava, Ostrava 70300, Czech Republic
| | | | - Zdenek Kala
- Department of Surgery, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno 62500, Czech Republic
| | - Jan Trna
- Department of Gastroenterology and Internal Medicine, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno 62500, Czech Republic
- Department of Gastroenterology and Digestive Endoscopy, Masaryk Memorial Cancer Institute, Brno 65653, Czech Republic
- Department of Internal Medicine, Hospital Boskovice, Boskovice 68001, Czech Republic
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10
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Youssefi M, Tafaghodi M, Farsiani H, Ghazvini K, Keikha M. Helicobacter pylori infection and autoimmune diseases; Is there an association with systemic lupus erythematosus, rheumatoid arthritis, autoimmune atrophy gastritis and autoimmune pancreatitis? A systematic review and meta-analysis study. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2021; 54:359-369. [PMID: 32891538 DOI: 10.1016/j.jmii.2020.08.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 07/07/2020] [Accepted: 08/16/2020] [Indexed: 02/05/2023]
Affiliation(s)
- Masoud Youssefi
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohsen Tafaghodi
- School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran; Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hadi Farsiani
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Kiarash Ghazvini
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Masoud Keikha
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran; Student Research Committee, Mashhad University of Medical Sciences, Mashhad, Iran.
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11
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Floreani A, Okazaki K, Uchida K, Gershwin ME. IgG4-related disease: Changing epidemiology and new thoughts on a multisystem disease. J Transl Autoimmun 2020; 4:100074. [PMID: 33490938 PMCID: PMC7806798 DOI: 10.1016/j.jtauto.2020.100074] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 11/19/2020] [Accepted: 12/10/2020] [Indexed: 02/07/2023] Open
Abstract
IgG4-related disease (IgG4-RD) represents an immune-mediated fibroinflammatory condition with peculiar histopathologic changes that can affect various organs. In 2012 its unified nomenclature was published, which allows to abandon other synonymous names. Up to now, only little is known about its epidemiology around the world. However, although it is generally considered a rare condition, the number of patients with IgG4-RD is increasing enormously. Likewise, the annual number of publications on this subject has increased progressively. The spectrum of clinical manifestations in IgG4-RD is highly variable, depending on the severity of the disease as well as the presence of organ(s) involvement. This review gives an overview on changing epidemiology of IgG4-RD focusing the attention on the large cohorts of patients published in the literature.
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Affiliation(s)
- Annarosa Floreani
- Scientific Consultant IRCCS Negrar, Verona, Italy
- Senior Scholar, University of Padova, Italy
| | - Kazuichi Okazaki
- Department of Gastroenterology and Hepatology, Kansai Medical University, Osaka, Japan
| | - Kazushige Uchida
- Department of Gastroenterology and Hepatology, Kansai Medical University, Osaka, Japan
| | - M. Eric Gershwin
- Division of Rheumatology Allergy and Clinical Immunology, University of California at Davis School of Medicine, Davis, CA, USA
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12
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Pancreatic Diseases and Microbiota: A Literature Review and Future Perspectives. J Clin Med 2020; 9:jcm9113535. [PMID: 33139601 PMCID: PMC7692447 DOI: 10.3390/jcm9113535] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 10/28/2020] [Accepted: 10/30/2020] [Indexed: 12/12/2022] Open
Abstract
Gut microbiota represent an interesting worldwide research area. Several studies confirm that microbiota has a key role in human diseases, both intestinal (such as inflammatory bowel disease, celiac disease, intestinal infectious diseases, irritable bowel syndrome) and extra intestinal disorders (such as autism, multiple sclerosis, rheumatologic diseases). Nowadays, it is possible to manipulate microbiota by administering prebiotics, probiotics or synbiotics, through fecal microbiota transplantation in selected cases. In this scenario, pancreatic disorders might be influenced by gut microbiota and this relationship could be an innovative and inspiring field of research. However, data are still scarce and controversial. Microbiota manipulation could represent an important therapeutic strategy in the pancreatic diseases, in addition to standard therapies. In this review, we analyze current knowledge about correlation between gut microbiota and pancreatic diseases, by discussing on the one hand existing data and on the other hand future possible perspectives.
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13
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Perugino CA, Stone JH. IgG4-related disease: an update on pathophysiology and implications for clinical care. Nat Rev Rheumatol 2020; 16:702-714. [PMID: 32939060 DOI: 10.1038/s41584-020-0500-7] [Citation(s) in RCA: 141] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/21/2020] [Indexed: 12/14/2022]
Abstract
IgG4-related disease (IgG4-RD) has only existed as a unique disease entity since 2003, yet remarkable progress has already been achieved in describing the essential features of the disease. A framework for systematic clinical studies has been created by the development of a quantitative disease activity tool (the IgG4-RD Responder Index) and the validation of classification criteria, both of which were the products of international, multi-centre investigations. In addition, substantial strides have been made in understanding the pathophysiology of IgG4-RD. In particular, the central role of B cells in the disease has been demonstrated by both the robust clinical responsiveness of IgG4-RD to B cell depletion and by the identification of multiple self-antigens that promote B cell expansion. CD4+ T cells have also been investigated in detail; CD4+ cytotoxic T lymphocytes (suspected of promoting disease) and a specific T follicular helper cell subset that contributes to IgG4 isotype switching have both been defined by multiple groups. The mechanisms by which these immune cells converge on target tissues, interact with fibroblasts and promote tissue remodelling are beginning to be understood and will be an important research focus in the coming years.
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Affiliation(s)
- Cory A Perugino
- Massachusetts General Hospital, Division of Rheumatology, Allergy and Immunology, Boston, MA, USA.,Ragon Institute of MGH, MIT and Harvard, Cambridge, MA, USA
| | - John H Stone
- Massachusetts General Hospital, Division of Rheumatology, Allergy and Immunology, Boston, MA, USA.
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Blaho M, Dítě P, Kunovský L, Kianička B. Autoimmune pancreatitis - An ongoing challenge. Adv Med Sci 2020; 65:403-408. [PMID: 32805624 DOI: 10.1016/j.advms.2020.07.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 04/15/2020] [Accepted: 07/13/2020] [Indexed: 02/07/2023]
Abstract
Autoimmune pancreatitis is a rare form of chronic pancreatitis. The first descriptions of the disease date back to the 1990s. Etiology is multifactorial, with the use of genetic, environmental and complex immunological mechanisms. It is classified into two subtypes. Type 1 is part of a group of diseases called IgG4-related disease. Clinically is autoimmune pancreatitis manifested by icterus and abdominal discomfort. It can rarely present as acute pancreatitis. There is also a completely asymptomatic form of the disease. The diagnosis is based on abnormalities in histology, imaging methods, serology, the involvement of other organs in relation to IgG4-related disease, and a significant positive response to corticosteroid therapy. Differential diagnosis between the focal form of autoimmune pancreatitis and pancreatic cancer can be complicated, with endosonography playing an important role. In the treatment, we use corticosteroids and other immunosuppressants including biological therapy. Patients with the asymptomatic disease should also be treated to prevent late complications and exocrine and endocrine insufficiency. In addition to drug treatment, endoscopic and/or surgical treatment may be necessary. Even after recovery, the disease can relapse. The relationship between autoimmune pancreatitis and malignancies has not been clearly confirmed. The goal of this review is to provide a comprehensive look at autoimmune pancreatitis and translate latest scientific knowledge into clinical practice.
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Affiliation(s)
- Martin Blaho
- Department of Internal Medicine, Department of Gastroenterology, University Hospital Ostrava, Ostrava, Czech Republic; Faculty of Medicine, University of Ostrava, Ostrava, Czech Republic; Department of Internal Medicine II - Gastroenterology and Geriatrics, Faculty of Medicine, Palacký University Olomouc and University Hospital, Olomouc, Czech Republic
| | - Petr Dítě
- Department of Internal Medicine, Department of Gastroenterology, University Hospital Ostrava, Ostrava, Czech Republic; Faculty of Medicine, University of Ostrava, Ostrava, Czech Republic
| | - Lumír Kunovský
- Department of Gastroenterology and Internal Medicine, University Hospital Brno, Brno, Czech Republic; Department of Surgery, University Hospital Brno, Brno, Czech Republic; Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Bohuslav Kianička
- Faculty of Medicine, Masaryk University, Brno, Czech Republic; 2nd Department of Internal Medicine, Department of Gastroenterology, St. Anne's University Hospital, Brno, Czech Republic.
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15
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Kountouras J, Papaefthymiou A, Polyzos SA, Zavos C, Doulberis M. Letter to the editor re: Li et al. (2020), ‘The potential role of bacteria in pancreatic cancer: A systematic review’. Carcinogenesis 2020; 41:539-540. [DOI: 10.1093/carcin/bgaa042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 03/25/2020] [Accepted: 05/09/2020] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jannis Kountouras
- Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Macedonia, Greece
| | - Apostolis Papaefthymiou
- Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Macedonia, Greece
| | - Stergios A Polyzos
- Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Macedonia, Greece
- First Department of Pharmacology, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece
| | - Christos Zavos
- Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Macedonia, Greece
| | - Michael Doulberis
- Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Macedonia, Greece
- Department of Gastroenterology and Hepatology, University of Zurich, Zurich, Switzerland
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16
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Kamisawa T, Zen Y, Nakazawa T, Okazaki K. Advances in IgG4-related pancreatobiliary diseases. Lancet Gastroenterol Hepatol 2019; 3:575-585. [PMID: 30047448 DOI: 10.1016/s2468-1253(18)30121-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 03/30/2018] [Accepted: 04/04/2018] [Indexed: 02/07/2023]
Abstract
Autoimmune pancreatitis is an unusual form of pancreatitis that is histologically characterised by a massive infiltration of lymphocytes and IgG4-positive plasma cells and storiform fibrosis. The disease is recognised as a pancreatic manifestation of IgG4-related disease. IgG4-related sclerosing cholangitis is a biliary counterpart that is typically associated with autoimmune pancreatitis. Two parallel immunological responses are thought to underlie the pathophysiology of these diseases: a pro-inflammatory, tissue-destructive process and an anti-inflammatory feedback response, which probably relates to IgG4 production. These diseases should be differentiated from conditions with a similar presentation (eg, pancreatobiliary malignancy, primary sclerosing cholangitis) by comparison of serum IgG4 concentration, imaging features, other organ involvement, histology, and steroid responsiveness. Corticosteroids are first-line drugs, although rituximab has been shown to effectively deplete B cells in IgG4-related disease. Although the risk of relapse is high, no standardised treatment protocol exists for relapsed cases.
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Affiliation(s)
- Terumi Kamisawa
- Department of Internal Medicine, Tokyo Metropolitan Komagome Hospital, Bunkyo-ku, Tokyo, Japan.
| | - Yoh Zen
- Department of Diagnostic Pathology, Kobe University, Chuo-ku, Kobe, Japan
| | - Takahiro Nakazawa
- Department of Gastroenterology, Japanese Red Cross Nagoya Daini Hospital, Showa-ku, Nagoya, Japan
| | - Kazuichi Okazaki
- Department of Gastroenterology and Hepatology, Kansai Medical University, Hirakata, Osaka, Japan
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17
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Kamisawa T, Nakazawa T, Tazuma S, Zen Y, Tanaka A, Ohara H, Muraki T, Inui K, Inoue D, Nishino T, Naitoh I, Itoi T, Notohara K, Kanno A, Kubota K, Hirano K, Isayama H, Shimizu K, Tsuyuguchi T, Shimosegawa T, Kawa S, Chiba T, Okazaki K, Takikawa H, Kimura W, Unno M, Yoshida M. Clinical practice guidelines for IgG4-related sclerosing cholangitis. JOURNAL OF HEPATO-BILIARY-PANCREATIC SCIENCES 2019; 26:9-42. [PMID: 30575336 PMCID: PMC6590186 DOI: 10.1002/jhbp.596] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
IgG4‐related sclerosing cholangitis (IgG4‐SC) is a distinct type of cholangitis frequently associated with autoimmune pancreatitis and currently recognized as a biliary manifestation of IgG4‐related disease. Although clinical diagnostic criteria of IgG4‐SC were established in 2012, differential diagnosis from primary sclerosing cholangitis and cholangiocarcinoma is sometimes difficult. Furthermore, no practical guidelines for IgG4‐SC are available. Because the evidence level of most articles retrieved through searching the PubMed, Cochrane Library, and Igaku Chuo Zasshi databases was below C based on the systematic review evaluation system of clinical practice guidelines MINDS 2014, we developed consensus guidelines using the modified Delphi approach. Three committees (a guideline creating committee, an expert panelist committee for rating statements according to the modified Delphi method, and an evaluating committee) were organized. Eighteen clinical questions (CQs) with clinical statements were developed regarding diagnosis (14 CQs) and treatment (4 CQs). Recommendation levels for clinical statements were set using the modified Delphi approach. The guidelines explain methods for accurate diagnosis, and safe and appropriate treatment of IgG4‐SC.
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Affiliation(s)
- Terumi Kamisawa
- Department of Internal Medicine, Tokyo Metropolitan, Komagome Hospital, Tokyo, Japan
| | - Takahiro Nakazawa
- Department of Gastroenterology, Japanese Red Cross Nagoya Daini Hospital, Nagoya, Japan
| | - Susumu Tazuma
- Department of General Internal Medicine, Hiroshima University Graduate School of Biomedical & Health Science, Hiroshima, Japan
| | - Yoh Zen
- Department of Diagnostic Pathology, Kobe University, Kobe, Japan
| | - Atsushi Tanaka
- Department of Medicine, Teikyo University School of Medicine, Tokyo, Japan
| | - Hirotaka Ohara
- Department of Community-Based Medical Education, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Takashi Muraki
- Department of Medicine, Gastroenterology, Shinshu University, Matsumoto, Nagano, Japan
| | - Kazuo Inui
- Department of Gastroenterology, Second Teaching Hospital, Fujita Health University, Nagoya, Japan
| | - Dai Inoue
- Department of Radiology, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Takayoshi Nishino
- Department of Gastroenterology, Tokyo Womens' Medical University Yachiyo Medical Center, Yachiyo, Japan
| | - Itaru Naitoh
- Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Takao Itoi
- Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo, Japan
| | - Kenji Notohara
- Department of Anatomic Pathology, Kurashiki Central Hospital, Kurashiki, Japan
| | - Atsushi Kanno
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kensuke Kubota
- Department of Endoscopy, Yokohama City University Hospital, Yokohama, Japan
| | - Kenji Hirano
- Department of Gastroenterology, Tokyo Takanawa Hospital, Tokyo, Japan
| | - Hiroyuki Isayama
- Department of Gastroenterology, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Kyoko Shimizu
- Department of Gastroenterology, Tokyo Womens' Medical University, Tokyo, Japan
| | | | - Tooru Shimosegawa
- Division of Gastroenterology, South-Miyagi Medical Center, Ohgawara, Japan
| | - Shigeyuki Kawa
- Department of Internal Medicine, Matsumoto Dental University, Matsumoto, Japan
| | | | - Kazuichi Okazaki
- The Third Department of Internal Medicine, Division of Gastroenterology and Hepatology, Kansai Medical University, Moriguchi, Japan
| | - Hajime Takikawa
- Department of Medicine, Teikyo University School of Medicine, Tokyo, Japan
| | - Wataru Kimura
- Faculty of Medicine, Departments of Gastroenterology and Gastroenterological, General, Breast, and Thyroid Surgery, Yamagata University, Yamagata, Japan
| | - Michiaki Unno
- Division of Hepato-Biliary Pancreatic Surgery, Tohoku University Graduate School, of Medicine, Sendai, Japan
| | - Masahiro Yoshida
- Department of Hepato-Biliary-Pancreatic and Gastrointestinal Surgery, School of Medicine, International University of Health and Welfare, Ichikawa, Japan
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18
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Detlefsen S, de Vos JD, Tanassi JT, Heegaard NHH, Fristrup C, Schaffalitzky de Muckadell OB. Value of anti-plasminogen binding peptide, anti-carbonic anhydrase II, immunoglobulin G4, and other serological markers for the differentiation of autoimmune pancreatitis and pancreatic cancer. Medicine (Baltimore) 2018; 97:e11641. [PMID: 30075546 PMCID: PMC6081052 DOI: 10.1097/md.0000000000011641] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The diagnosis of autoimmune pancreatitis (AIP) and its differential diagnosis from pancreatic cancer (PC) can be challenging. In this retrospective study, we aimed to evaluate the value of anti-plasminogen binding peptide (a-PBP), immunoglobulin G4 (IgG4), and anti-carbonic anhydrase-II (a-CA-II), together with other serological markers whose value is not fully elucidated.The serum levels of a-PBP, IgG4, IgG, anti-nuclear antibodies (ANA), anti-lactoferrin (a-LF), a-CA-II, and rheumatoid factor (RF) were evaluated in patients with AIP (n = 29), PC (n = 17), pancreatic neuroendocrine neoplasm (P-NEN, n = 12), and alcoholic chronic pancreatitis (ACP, n = 41). ANCA were measured in the AIP patients.There was no statistically significant difference in mean a-PBP values in AIP compared with PC. A ROC curve showed that, when using a cut-off of 38.3 U, low values of a-PBP had a sensitivity and specificity of 45% and 71% for differentiating AIP from PC. The sensitivity and specificity of IgG4 (cut-off 1.4 g/L) for differentiating AIP from PC was 45% and 88%, but rose to 52% and 88% when using a cut-off of 1.09 g/L. When using this cut-off, the sensitivity and specificity for differentiating type 1 AIP from PC was 68% and 88%. None of the other markers were significantly changed in AIP versus PC. For differentiation of type 1 and type 2 AIP, the only significant differences were IgG4 in type 1 AIP (P < .01), with a sensitivity of 68% and a specificity of 80%, and c-ANCA elevations found in some type 2 AIP patients (P < .05).The only serological marker for which we found a statistically significant difference in mean values between AIP and PC was IgG4. However, the value of IgG4 for the distinction of AIP from PC was limited, probably in part due to the relatively high number of type 2 AIP patients in our study. In accord with recent publications, our data do not support a role of increased serum a-PBP for the diagnosis of AIP.
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Affiliation(s)
- Sönke Detlefsen
- Department of Pathology
- Odense Pancreas Center (OPAC), Odense University Hospital
- Institute of Clinical Research, University of Southern Denmark
| | - Jesper D. de Vos
- Institute of Clinical Research, University of Southern Denmark
- Department of Medical Gastroenterology, Odense University Hospital, Odense
| | - Julia T. Tanassi
- Department of Autoimmunology and Biomarkers, Statens Serum Institute, Copenhagen
| | - Niels H. H. Heegaard
- Department of Autoimmunology and Biomarkers, Statens Serum Institute, Copenhagen
- Department of Clinical Biochemistry and Pharmacology
| | - Claus Fristrup
- Odense Pancreas Center (OPAC), Odense University Hospital
- Department of Surgery, Odense University Hospital, Odense, Denmark
| | - Ove B. Schaffalitzky de Muckadell
- Institute of Clinical Research, University of Southern Denmark
- Department of Medical Gastroenterology, Odense University Hospital, Odense
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Haldar D, Hirschfield GM. Deciphering the biology of IgG4-related disease: specific antigens and disease? Gut 2018; 67:602-605. [PMID: 29101259 PMCID: PMC6058063 DOI: 10.1136/gutjnl-2017-314861] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 09/14/2017] [Indexed: 12/24/2022]
Affiliation(s)
- Debashis Haldar
- Centre for Liver Research, NIHR Birmingham Biomedical Research Centre, University of Birmingham, Birmingham, UK
| | - Gideon M Hirschfield
- Centre for Rare Diseases, Institute of Translational Medicine, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
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20
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Zarei M, Mosayebi G, Khansarinejad B, Abtahi H. Antigenic and immunogenic evaluation of Helicobacter pylori FlaA epitopes. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2017; 20:920-926. [PMID: 29085584 PMCID: PMC5651478 DOI: 10.22038/ijbms.2017.9115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Objective(s): Helicobacter pylori are among most common human pathogens affecting at least half of the world’s population. Mobility is one of the important primary factors in bacterial colonization and invasion. The purpose of this research is cloning, expression, and purification of FlaA protein specific epitopes in order to evaluate their antigenicity and immunogenicity. Materials and Methods: The antigenic region of the flaA gene was bioinformatically predicted using Epitope mapping software’s and the predicted epitopes were expressed in a prokaryotic expression vector. The antigen was injected into the animal model (mice BALB/c) and some indicators including IgG1, IgG2a, IgA, IFN-γ, and IL 5 were measured. Results: The immunogenicity studies in animal models by measuring serum antibodies (IgG1, IgG2a, and IgA) and cytokines (IFN-γ and IL5) revealed that the rFlaA induces a proper immune response in animal models. Conclusion: The recombinant FlaA protein is antigenic and immunogenic. Therefore, it might be used in order to design of specific diagnostic kits and recombinant vaccines against H. pylori.
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Affiliation(s)
- Mansoor Zarei
- Department of Medical Biotechnology, School of Medicine, Arak University of Medical Sciences, Arak, Iran
| | - Ghasem Mosayebi
- Department of Microbiology and Immunology, School of Medicine, Arak University of Medical Sciences, Arak, Iran
| | - Behzad Khansarinejad
- Department of Microbiology and Immunology, School of Medicine, Arak University of Medical Sciences, Arak, Iran
| | - Hamid Abtahi
- Molecular and Medicine Research Center, Department of Microbiology and Immunology, School of Medicine, Arak University of Medical Sciences, Arak, Iran
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