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He R, Zhao S, Cui M, Chen Y, Ma J, Li J, Wang X. Cutaneous manifestations of inflammatory bowel disease: basic characteristics, therapy, and potential pathophysiological associations. Front Immunol 2023; 14:1234535. [PMID: 37954590 PMCID: PMC10637386 DOI: 10.3389/fimmu.2023.1234535] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 10/16/2023] [Indexed: 11/14/2023] Open
Abstract
Inflammatory bowel disease (IBD) is a chronic inflammatory disease typically involving the gastrointestinal tract but not limited to it. IBD can be subdivided into Crohn's disease (CD) and ulcerative colitis (UC). Extraintestinal manifestations (EIMs) are observed in up to 47% of patients with IBD, with the most frequent reports of cutaneous manifestations. Among these, pyoderma gangrenosum (PG) and erythema nodosum (EN) are the two most common skin manifestations in IBD, and both are immune-related inflammatory skin diseases. The presence of cutaneous EIMs may either be concordant with intestinal disease activity or have an independent course. Despite some progress in research on EIMs, for instance, ectopic expression of gut-specific mucosal address cell adhesion molecule-1 (MAdCAM-1) and chemokine CCL25 on the vascular endothelium of the portal tract have been demonstrated in IBD-related primary sclerosing cholangitis (PSC), little is understood about the potential pathophysiological associations between IBD and cutaneous EIMs. Whether cutaneous EIMs are inflammatory events with a commonly shared genetic background or environmental risk factors with IBD but independent of IBD or are the result of an extraintestinal extension of intestinal inflammation, remains unclear. The review aims to provide an overview of the two most representative cutaneous manifestations of IBD, describe IBD's epidemiology, clinical characteristics, and histology, and discuss the immunopathophysiology and existing treatment strategies with biologic agents, with a focus on the potential pathophysiological associations between IBD and cutaneous EIMs.
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Affiliation(s)
- Ronghua He
- Department of Gastroenterology, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Subei Zhao
- Department of Endocrinology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Mingyu Cui
- Department of Gastroenterology, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Yanhao Chen
- Department of Gastroenterology, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Jinrong Ma
- Department of Gastroenterology, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Jintao Li
- Department of Gastroenterology, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Xiaodong Wang
- Department of Gastroenterology, The Second Hospital of Jilin University, Changchun, Jilin, China
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2
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Hanzel J, Ma C, Casteele NV, Khanna R, Jairath V, Feagan BG. Vedolizumab and Extraintestinal Manifestations in Inflammatory Bowel Disease. Drugs 2021; 81:333-347. [PMID: 33400241 DOI: 10.1007/s40265-020-01460-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In Crohn's disease and ulcerative colitis, inflammation is not limited to the digestive tract. Extraintestinal manifestations (EIMs), which affect up to 50% of patients, can substantially impair quality of life. EIMs may parallel luminal disease activity or have an independent course. They most commonly involve the musculoskeletal system (e.g., peripheral or axial arthritis) and skin (e.g., erythema nodosum and pyoderma gangrenosum). Less commonly, the hepatobiliary tract (e.g., primary sclerosing cholangitis [PSC]) and the eye (e.g., episcleritis, scleritis, and uveitis) are involved. Although the pathophysiology of EIMs is poorly understood, they are likely either manifestations of a primary systemic immune disease with variable expression amongst organs, or secondary phenomena to bowel inflammation. Additional pathophysiologic mechanisms may include aberrant lymphocyte homing mediated by ectopic expression of gut-specific chemokines and adhesion molecules, cross-reactivity between microbial and self-antigens, autoantibodies against epitopes shared by the intestine and extraintestinal tissues, elevated serum concentrations of cytokines, and alterations in innate immunity. Many EIMs independent of intestinal disease activity can be successfully treated with tumor necrosis factor (TNF) antagonists. The efficacy of vedolizumab-a monoclonal antibody targeting the α4β7 integrin-for the treatment of EIMs is uncertain, but data are emerging from post hoc analyses of randomized controlled trials, prospective and retrospective cohort studies, and case series. Vedolizumab may be effective in treating EIMs related to luminal disease activity (e.g., type 1 peripheral arthritis and erythema nodosum) but has not shown biochemical improvement in PSC. Its postulated role in the development of de novo EIMs is heavily confounded by the high proportion of patients previously exposed to TNF antagonists; new EIMs could result from TNF antagonist treatment cessation rather than being caused by vedolizumab. A common limitation of clinical studies is the lack of multidisciplinary involvement in the diagnosis and monitoring of EIMs, which may lead to misdiagnosis and overreporting. Future studies should rigorously measure EIMs in parallel with objective measures of luminal disease activity to provide more robust data on the relative efficacy of new drugs, especially as increasing numbers of gut-selective compounds enter clinical development.
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Affiliation(s)
- Jurij Hanzel
- Department of Gastroenterology, University Medical Center Ljubljana, Ljubljana, Slovenia.,Alimentiv, #200, 100 Dundas Street, London, N6A 5B6, ON, Canada.,, Hullenbergweg 278-308, 1101 BV, Amsterdam, The Netherlands
| | - Christopher Ma
- Alimentiv, #200, 100 Dundas Street, London, N6A 5B6, ON, Canada.,Division of Gastroenterology and Hepatology, Cumming School of Medicine, University of Calgary, 6D61 Teaching Research Wellness Building, 3280 Hospital Drive NW, Calgary, Alberta, T2N 4Z6, Canada
| | - Niels Vande Casteele
- Alimentiv, #200, 100 Dundas Street, London, N6A 5B6, ON, Canada.,Department of Medicine, University of California San Diego, 9500 Gilman Drive #0956, La Jolla, CA, 92093, USA
| | - Reena Khanna
- Division of Gastroenterology, University of Western Ontario, 1151 Richmond Street, London, N6A 2K7, ON, Canada
| | - Vipul Jairath
- Alimentiv, #200, 100 Dundas Street, London, N6A 5B6, ON, Canada.,Division of Gastroenterology, University of Western Ontario, 1151 Richmond Street, London, N6A 2K7, ON, Canada.,Department of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada
| | - Brian G Feagan
- Alimentiv, #200, 100 Dundas Street, London, N6A 5B6, ON, Canada. .,Division of Gastroenterology, University of Western Ontario, 1151 Richmond Street, London, N6A 2K7, ON, Canada. .,Department of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada. .,Department of Medicine, University of Western Ontario, London, ON, Canada.
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3
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Parfenov AI, Kagramanova AV, Knyazev OV. [Systemic manifestations of inflammatory bowel diseases]. TERAPEVT ARKH 2020; 92:4-11. [PMID: 32598711 DOI: 10.26442/00403660.2020.02.000535] [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: 04/25/2020] [Indexed: 01/06/2023]
Abstract
The article is devoted to the current data regarding the pathogenesis, classification and frequency of extraintestinal manifestations (EIMs) in inflammatory bowel diseases. We discuss two distinct theories of EIMs pathogenesis. First, EIMs arise from an extension of antigen-specific immune responses from the intestine to non-intestinal sites. Second, EIMs are independent inflammatory events initiated or perpetuated by the presence of IBD or by shared genetic or environmental risk factors in the host. These mechanisms are not mutually exclusive and may contribute to varying degrees in different EIMs. Early diagnosis of EIMs contributes to prevention disability and enhancement of quality of life of IBD patients. It is concluded that treatment of extraintestinal manifestations should be carried out taking into account the course of the IBD and the multidisciplinary approach, which requires close cooperation of doctors of various specialties. Assessment of prognostic markers and predictors for EIM in IBD will be part of a future investigation.
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Affiliation(s)
- A I Parfenov
- Loginov Moscow Clinical Scientific Practical Center
| | | | - O V Knyazev
- Loginov Moscow Clinical Scientific Practical Center
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4
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Muñiz Pedrogo DA, Chen J, Hillmann B, Jeraldo P, Al-Ghalith G, Taneja V, Davis JM, Knights D, Nelson H, Faubion WA, Raffals L, Kashyap PC. An Increased Abundance of Clostridiaceae Characterizes Arthritis in Inflammatory Bowel Disease and Rheumatoid Arthritis: A Cross-sectional Study. Inflamm Bowel Dis 2019; 25:902-913. [PMID: 30321331 PMCID: PMC6458525 DOI: 10.1093/ibd/izy318] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Indexed: 12/13/2022]
Abstract
BACKGROUND Inflammatory bowel diseases (IBDs) are a group of heterogeneous inflammatory conditions affecting the gastrointestinal tract. Although there is considerable evidence linking the gut microbiota to intestinal inflammation, there is limited knowledge on its potential role in the development of extraintestinal manifestations of IBD. METHODS Four groups of patients were included: IBD-associated arthropathy (IBD-A); IBD without arthropathy (IBD-N); rheumatoid arthritis (RA); and non-IBD, nonarthritis controls. DNA from stool samples was isolated and sequenced using the Illumina platform. Paired-end reads were quality-controlled using SHI7 and processed with SHOGUN. Abundance and diversity analyses were performed using QIIME, and compositional biomarker identification was performed using LEfSe. RESULTS One hundred eighty patients were included in the analysis. IBD-A was associated with an increased abundance of microbial tyrosine degradation pathways when compared with IBD-N (P = 0.02), whereas IBD-A and RA patients both shared an increased abundance of Clostridiaceae when compared with controls (P = 0.045). We found that history of bowel surgery was a significant source of variability (P = 0.001) among all IBD patients and was associated with decreased alpha diversity and increased abundance of Enterobacteriaceae (P = 0.004). CONCLUSIONS An increased abundance of gut microbial tyrosine degradation pathways was associated with IBD-A. An increased abundance of Clostridiaceae was shared by both IBD-A and RA patients and suggests a potentially common microbial link for inflammatory arthritis. The increased abundance of Enterobacteriaceae, previously reported in IBD, may be due to the effects of previous bowel surgery and highlights the importance of controlling for this variable in future studies.
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Affiliation(s)
- David A Muñiz Pedrogo
- Center for Clinical and Translational Science, Mayo Clinic, Rochester, Minnesota,University of Puerto Rico School of Medicine, San Juan, Puerto Rico
| | - Jun Chen
- Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota
| | - Benjamin Hillmann
- Department of Computer Science and Engineering, University of Minnesota, Minneapolis, Minnesota
| | | | - Gabriel Al-Ghalith
- Department of Computer Science and Engineering, University of Minnesota, Minneapolis, Minnesota
| | - Veena Taneja
- Department of Immunology, Mayo Clinic, Rochester, Minnesota
| | - John M Davis
- Division of Rheumatology, Mayo Clinic, Rochester, Minnesota
| | - Dan Knights
- Department of Computer Science and Engineering, University of Minnesota, Minneapolis, Minnesota
| | - Heidi Nelson
- Department of Surgery, Mayo Clinic, Rochester, Minnesota
| | - William A Faubion
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota
| | - Laura Raffals
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota
| | - Purna C Kashyap
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota,Address correspondence to: Purna C. Kashyap, MBBS, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN 55905 ()
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5
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Hedin CRH, Vavricka SR, Stagg AJ, Schoepfer A, Raine T, Puig L, Pleyer U, Navarini A, van der Meulen-de Jong AE, Maul J, Katsanos K, Kagramanova A, Greuter T, González-Lama Y, van Gaalen F, Ellul P, Burisch J, Bettenworth D, Becker MD, Bamias G, Rieder F. The Pathogenesis of Extraintestinal Manifestations: Implications for IBD Research, Diagnosis, and Therapy. J Crohns Colitis 2019; 13:541-554. [PMID: 30445584 DOI: 10.1093/ecco-jcc/jjy191] [Citation(s) in RCA: 92] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This article reports on the sixth scientific workshop of the European Crohn's and Colitis Organisation [ECCO] on the pathogenesis of extraintestinal manifestations [EIMs] in inflammatory bowel disease [IBD]. This paper has been drafted by 15 ECCO members and 6 external experts [in rheumatology, dermatology, ophthalmology, and immunology] from 10 European countries and the USA. Within the workshop, contributors formed subgroups to address specific areas. Following a comprehensive literature search, the supporting text was finalized under the leadership of the heads of the working groups before being integrated by the group consensus leaders.
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Affiliation(s)
- C R H Hedin
- Gastroenterology unit, Patient Area Gastroenterology, Dermatovenereology and Rheumatology, Karolinska University Hospital, Stockholm, Sweden
| | - S R Vavricka
- Department of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland
| | - A J Stagg
- Centre for Immunobiology, Bart's and The London Medical School, Queen Mary University of London, London, UK
| | - A Schoepfer
- Division of Gastroenterology and Hepatology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland
| | - T Raine
- Department of Gastroenterology, Addenbrooke's Hospital, Cambridge University Teaching Hospitals NHS Foundation Trust, Cambridge, UK
| | - L Puig
- Department of Dermatology, Hospital de la Santa Creu i Sant Pau. Universitat Autònoma de Barcelona, Barcelona, Catalonia, Spain
| | - U Pleyer
- University Eye Clinic, Uveitis Center, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - A Navarini
- Department of Dermatology, University Hospital Zurich, Zurich, Switzerland
| | | | - J Maul
- Gastroenterologie am Bayerischen Platz, Berlin, Germany.,Department of Medicine (Gastroenterology, Infectious Diseases, Rheumatology), Campus Benjamin Franklin, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - K Katsanos
- Division of Gastroenterology, Department of Internal Medicine, Medical School, University of Ioannina School of Medical Sciences, Ioannina, Greece
| | - A Kagramanova
- IBD Department, The Loginov Moscow Clinical Scientific Centre, Moscow, Russia
| | - T Greuter
- Division of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland.,Gastroenterology Research Unit, Mayo Clinic, Rochester, MN, USA
| | - Y González-Lama
- IBD Unit, Gastroenterology and Hepatology Department, Puerta de Hierro University Hospital, Majadahonda, Madrid, Spain
| | - F van Gaalen
- Department of Rheumatology, Leiden University Medical Center [LUMC], Leiden, Netherlands
| | - P Ellul
- Department of Medicine, Division of Gastroenterology, Mater Dei Hospital, Msida, Malta
| | - J Burisch
- Center for Clinical Research and Prevention, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark.,Abdominal Center K, Medical Section, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - D Bettenworth
- Department of Medicine B, Gastroenterology and Hepatology, University Hospital Münster, Münster, Germany
| | - M D Becker
- Department of Ophthalmology, Triemli Hospital, Zurich, Switzerland & Department of Ophthalmology, University of Heidelberg, Heidelberg, Germany
| | - G Bamias
- National and Kapodistrian University of Athens, GI Unit, 3rd Academic Department of Internal Medicine, Sotiria Hospital, Athens, Greece
| | - F Rieder
- Department of Gastroenterology, Hepatology and Nutrition; Digestive Diseases and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
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6
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Jang HJ, Kang B, Choe BH. The difference in extraintestinal manifestations of inflammatory bowel disease for children and adults. Transl Pediatr 2019; 8:4-15. [PMID: 30881893 PMCID: PMC6382501 DOI: 10.21037/tp.2019.01.06] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Extraintestinal manifestations (EIMs) are frequently observed in adult and pediatric patients with inflammatory bowel disease (IBD). The most common EIMs involve the joints, skin, and eyes, but they can affect various organs and result in significant morbidity. Since EIMs can appear years before the diagnosis of IBD is made, clinicians should be aware of their various manifestations to help decrease diagnostic delay of IBD and establish appropriate treatment plans.
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Affiliation(s)
- Hyo-Jeong Jang
- Department of Pediatrics, Keimyung University School of Medicine, Daegu, South Korea
| | - Ben Kang
- Department of Pediatrics, School of Medicine, Kyungpook National University, Daegu, South Korea
| | - Byung-Ho Choe
- Department of Pediatrics, School of Medicine, Kyungpook National University, Daegu, South Korea
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7
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Berkowitz L, Schultz BM, Salazar GA, Pardo-Roa C, Sebastián VP, Álvarez-Lobos MM, Bueno SM. Impact of Cigarette Smoking on the Gastrointestinal Tract Inflammation: Opposing Effects in Crohn's Disease and Ulcerative Colitis. Front Immunol 2018; 9:74. [PMID: 29441064 PMCID: PMC5797634 DOI: 10.3389/fimmu.2018.00074] [Citation(s) in RCA: 110] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Accepted: 01/11/2018] [Indexed: 01/06/2023] Open
Abstract
Cigarette smoking is a major risk factor for gastrointestinal disorders, such as peptic ulcer, Crohn’s disease (CD), and several cancers. The mechanisms proposed to explain the role of smoking in these disorders include mucosal damage, changes in gut irrigation, and impaired mucosal immune response. Paradoxically, cigarette smoking is a protective factor for the development and progression of ulcerative colitis (UC). UC and CD represent the two most important conditions of inflammatory bowel diseases, and share several clinical features. The opposite effects of smoking on these two conditions have been a topic of great interest in the last 30 years, and has not yet been clarified. In this review, we summarize the most important and well-understood effects of smoking in the gastrointestinal tract; and particularly, in intestinal inflammation, discussing available studies that have addressed the causes that would explain the opposite effects of smoking in CD and UC.
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Affiliation(s)
- Loni Berkowitz
- Millennium Institute on Immunology and Immunotherapy, Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.,Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Bárbara M Schultz
- Millennium Institute on Immunology and Immunotherapy, Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Geraldyne A Salazar
- Millennium Institute on Immunology and Immunotherapy, Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Catalina Pardo-Roa
- Millennium Institute on Immunology and Immunotherapy, Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Valentina P Sebastián
- Millennium Institute on Immunology and Immunotherapy, Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Manuel M Álvarez-Lobos
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Susan M Bueno
- Millennium Institute on Immunology and Immunotherapy, Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
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8
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Vavricka SR, Schoepfer A, Scharl M, Lakatos PL, Navarini A, Rogler G. Extraintestinal Manifestations of Inflammatory Bowel Disease. Inflamm Bowel Dis 2015; 21:1982-92. [PMID: 26154136 PMCID: PMC4511685 DOI: 10.1097/mib.0000000000000392] [Citation(s) in RCA: 416] [Impact Index Per Article: 46.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 02/09/2015] [Indexed: 02/07/2023]
Abstract
Extraintestinal manifestations (EIM) in inflammatory bowel disease (IBD) are frequent and may occur before or after IBD diagnosis. EIM may impact the quality of life for patients with IBD significantly requiring specific treatment depending on the affected organ(s). They most frequently affect joints, skin, or eyes, but can also less frequently involve other organs such as liver, lungs, or pancreas. Certain EIM, such as peripheral arthritis, oral aphthous ulcers, episcleritis, or erythema nodosum, are frequently associated with active intestinal inflammation and usually improve by treatment of the intestinal activity. Other EIM, such as uveitis or ankylosing spondylitis, usually occur independent of intestinal inflammatory activity. For other not so rare EIM, such as pyoderma gangrenosum and primary sclerosing cholangitis, the association with the activity of the underlying IBD is unclear. Successful therapy of EIM is essential for improving quality of life of patients with IBD. Besides other options, tumor necrosis factor antibody therapy is an important therapy for EIM in patients with IBD.
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Affiliation(s)
- Stephan R. Vavricka
- Department of Medicine, Division of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland
- Department of Medicine, Division of Gastroenterology and Hepatology, Triemlispital Zurich, Zurich, Switzerland
| | - Alain Schoepfer
- Department of Medicine, Division of Gastroenterology and Hepatology, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland
| | - Michael Scharl
- Department of Medicine, Division of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland
| | - Peter L. Lakatos
- 1st Department of Medicine, Semmelweis University, Budapest, Hungary; and
| | - Alexander Navarini
- Department of Dermatology, University Hospital Zurich, Zurich, Switzerland
| | - Gerhard Rogler
- Department of Medicine, Division of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland
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9
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Affiliation(s)
- Kiron M Das
- Division of Gastroenterology and Hepatology, Department of Medicine, UMDNJ-Robert Wood Johnson Medical School, New Jersey, USA
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Yantiss RK, Das KM, Farraye FA, Odze RD. Alterations in the immunohistochemical expression of Das-1 and CG-3 in colonic mucosal biopsy specimens helps distinguish ulcerative colitis from Crohn disease and from other forms of colitis. Am J Surg Pathol 2008; 32:844-50. [PMID: 18408596 DOI: 10.1097/pas.0b013e31815b121c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Distinction between ulcerative colitis (UC) and Crohn disease (CD) in mucosal biopsies is often difficult. Das-1 and CG-3 are monoclonal antibodies directed against an unknown colonic epithelial protein and human tropomyosin isoform-5, respectively, both show altered expression in patients with UC. In this study, we evaluated the utility of Das-1 and CG-3 in distinguishing UC from CD and from other types of colitis. One colonic biopsy specimen from each of 85 patients with confirmed UC (n=25), CD (n=15), lymphocytic (n=15), collagenous (n=15), and ischemic (n=15) colitis, and also 10 samples from normal controls, were stained for Das-1 and CG-3 using standard techniques. Reactivity for Das-1 and CG-3 was noted to be absent or present, and the location (ie, surface+/-crypt epithelium) and degree (weak or strong) of CG-3 staining was recorded. Loss of Das-1 staining occurred more frequently in UC (96%) compared with CD (20%), lymphocytic (20%), collagenous (13%), and ischemic colitis (0%) cases, as well as controls (10%, P<0.001 for all comparisons). CG-3 positivity in crypt epithelium was significantly more common in UC (52%) compared with the other groups (P< or =0.02 for all comparisons). The combination of strong crypt CG-3 staining and loss of Das-1 staining was noted in 44% of UC cases, but not in any other type of colitis (P=0.003 for all comparisons). We conclude that the patterns of Das-1 and CG-3 staining in colonic mucosal biopsies may be clinically useful in distinguishing UC from CD and from other colitidies.
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Affiliation(s)
- Rhonda K Yantiss
- Department of Pathology and Laboratory Medicine, Weill Medical College of Cornell University, New York, NY,
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11
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Watari J, Das KK, Amenta PS, Tanabe H, Tanaka A, Geng X, Lin JJC, Kohgo Y, Das KM. Effect of eradication of Helicobacter pylori on the histology and cellular phenotype of gastric intestinal metaplasia. Clin Gastroenterol Hepatol 2008; 6:409-17. [PMID: 18321787 DOI: 10.1016/j.cgh.2007.12.044] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Eradication of Helicobacter pylori appears to reduce gastric cancer incidence. We examined the effect of successful H pylori therapy on histology, phenotype of gastric intestinal metaplasia (GIM) (complete vs incomplete), and expression of several biomarkers related to carcinogenesis. METHODS Ninety-six H pylori-positive patients from Japan were treated successfully and followed up prospectively over 4 years with yearly endoscopy and were classified into 3 groups: group CG, chronic gastritis without GIM (n = 36); group IM, chronic gastritis with GIM (n = 33); group DYS, and GIM with dysplasia/cancer in a different location of the stomach (n = 27). A total of 288 endoscopic procedures were performed. Histology, mucin-histochemistry, and immunoperoxidase assays using monoclonal antibodies (mAbs) for cell phenotype (monoclonal antibody Das-1/colonic) and for neoplasia (TC22 and p53) were performed. RESULTS The GIM histologic score was higher in group DYS than in group IM (P < .05) and group CG (P < .0001). The GIM scores did not change in groups IM and DYS over 4 years. mAb Das-1 reactivity was higher in group DYS (63%) than in group IM (39%) and group GC (0%). After eradication of H pylori, mAb Das-1 reactivity disappeared in 40% of patients (P < .0001) despite the unchanged GIM scores, and regression of TC22-4 was noted in the same patients. CONCLUSIONS H pylori eradication does not reduce the histologic GIM score, but changes the cellular phenotype of GIM. This change of phenotype may be an important factor in the reduction of cancer incidence after eradication of H pylori.
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Affiliation(s)
- Jiro Watari
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical College, Asahikawa, Japan
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12
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Das KM, Bajpai M. Tropomyosins in human diseases: ulcerative colitis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2008; 644:158-67. [PMID: 19209821 DOI: 10.1007/978-0-387-85766-4_13] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Ulcerative colitis (UC) is a form of chronic inflammatory bowel disease (IBD) that almost always affects the rectal mucosa and variable length of the colon in continuity and at times mucosa of the entire colon. It is not caused by any specific pathogen. Genetics, environmental factors and altered immune responses to dietary macromolecules, colonic bacteria and cellular proteins have been implicated in the pathogenesis of UC. Autoimmune response against cytoskeletal, microfilament protein tropomyosin (Tm) seems to play an important role in the pathogenesis of UC. The predominant colonic epithelial Tm isoform, hTm5, can induce both humoral (B-cells) and cellular (T-cells) response in patients with UC. Such responses are not seen in normal subjects and disease control subjects, such as patients with Crohn's disease (CD, another type of IBD) and patients with lupus. A novel observation that hTm5 is expressed on colon epithelial cell surface but not on small intestinal epithelial cells provides evidence for presentation to immune effector cells. This surface expression of hTm5 seems to be facilitated by a colon epithelial cell membrane associated protein, CEP, that acts as a chaperone for the trans-migration of hTm5 to the surface and both hTm5 and CEP are then released outside the cell. Both CEP and hTm5 expression are increased with pro-inflammatory cytokine, such as gamma-interferon. hTm5 expression in UC mucosa is also significantly increased compared to normal. Finally, autoantibodies against hTm5 observed both in circulation and in the colon mucosa of patients with UC are pathogenic causing colon epithelial cell destruction by antibody and complement mediated cytolysis.
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Affiliation(s)
- Kiron M Das
- Division of Gastroenterology and Hepatology, Department of Medicine, Crohn's and Colitis Center of New Jersey, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, NJ 08903, USA.
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Lu H, Goodell V, Disis ML. Targeting serum antibody for cancer diagnosis: a focus on colorectal cancer. Expert Opin Ther Targets 2007; 11:235-44. [PMID: 17227237 DOI: 10.1517/14728222.11.2.235] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The ability of the immune system to magnify the appearance of disease by generating relatively large amounts of antibody in response to small amounts of disease makes it a natural biosensor, and serum antibodies have emerged as promising biomarkers for the detection of cancer. This review summarizes recent progress in targeting serum antibodies for cancer diagnosis, with a particular focus on colorectal cancer (CRC). Several serum antibodies have been detected at increased levels in CRC patients, including p53, carcinoembryonic antigen, Ras, topoisomerase II-alpha, histone deacetylase 3 and 5, ubiquitin C-terminal hydrolase L3, tropomyosin and cyclin B1. As each antibody is only present in a limited proportion of patients (usually < 40%), a combination of serum antibodies that defines the 'immunological signature' of cancer needs to be developed. High-throughput methods to identify new serum antibodies for cancer diagnosis are also reviewed.
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Affiliation(s)
- Hailing Lu
- Tumor Vaccine Group, Center for Translational Medicine in Women's Health, University of Washington, 815 Mercer Street, Room 219, Seattle, WA, USA.
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Mirza ZK, Sastri B, Lin JJC, Amenta PS, Das KM. Autoimmunity against human tropomyosin isoforms in ulcerative colitis: localization of specific human tropomyosin isoforms in the intestine and extraintestinal organs. Inflamm Bowel Dis 2006; 12:1036-43. [PMID: 17075344 DOI: 10.1097/01.mib.0000231573.65935.67] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND Tropomyosins (TMs) are microfilament cytoskeletal proteins, and 5 major human TM isoforms (hTM1-5) are described. hTMs, particularly isoform 5 (hTM5), is capable of inducing autoantibodies and T-cell response in ulcerative colitis (UC). However, cellular localization of hTM isoforms in the colon and in extraintestinal organs commonly involved in UC is unknown. METHODS Using isoform-specific monoclonal antibodies, we localized hTMs through immunoperoxidase assay in normal colon (n = 12), small intestine (n = 14), esophagus (n = 10), skin (n = 19), eye (n = 12), gallbladder (n = 16), liver, including bile duct at the porta hepatis (n = 4), lungs (n = 4), and pancreas (n = 4). RESULTS There is intense expression of hTM5, but not other isoforms, in the epithelium of the colon, gallbladder, and skin. In the eye, hTM5 is expressed only in the nonpigmented ciliary epithelium. Although extrahepatic and interlobar large ductal biliary epithelium was positive, bile canaliculi at the portal tract are negative. The immunoreactivity in epithelial cells from these organs is diffuse cytoplasmic and along the periphery. In colon epithelium, there is intense expression along basolateral areas and luminal (apical) surface. In the small intestinal epithelium, however, hTM5 expression is weak and distinctly different than in the colon. hTM5 was not detected in the squamous epithelium of the esophagus, although it was strongly positive in the skin. hTM1, hTM2, and hTM3 are localized predominantly in smooth muscle of the intestine and blood vessel wall but not the epithelium. HTM4 is localized in the endothelial cells and basement membrane of the colonic epithelium. CONCLUSIONS hTM5 is the predominant isoform in the epithelium of colon and extraintestinal organs commonly involved in UC. The unique expression of hTM5 may allow its interaction with effector immune cells involved in the immunopathogenesis of UC and its extraintestinal manifestations.
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Affiliation(s)
- Zafar K Mirza
- Crohn's and Colitis Center of New Jersey, UMDNJ-Robert Wood Johnson Medical School, New Brunswick 08903, USA
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Brandtzaeg P, Carlsen HS, Halstensen TS. The B-cell system in inflammatory bowel disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2006; 579:149-67. [PMID: 16620017 DOI: 10.1007/0-387-33778-4_10] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Secretory immunity is the best-defined part ot the mucosal immune system. This adaptive humoral defense mechanism depends on a fine-tuned cooperation between secretory epithelia and local plasma cells. Such mucosal immunocytes produce preferentially dimers and larger polymers of immunoglobulin A (collectively called pIgA), which contain J chain and therefore can bind to the epithelial secretory component (SC). This transmembrane glycoprotein functions as pIg receptor (pIgR) that also translocates pentameric IgM to the epithelial surface. B cells with a high level of J-chain expression and pIg-pIgR interactions at mucosal effector sites are thus necessary for the generation of secretory antibodies (SIgA and SIgM). Secretory antibodies perform immune exclusion in a first-line defense, thereby counteracting microbial colonization and mucosal penetration of soluble antigens. However, local production of pIgA is significantly down-regulated in inflammatory bowel disease (IBD), as revealed by strikingly decreased J-chain expression. Although the total increase of the immunocyte population in IBD lesions probably compensates for the relatively reduced pIgA production, decreased pIgR/SC expression in regenerating and dysplastic epithelium signifies that the SIgA system is topically deficient. There is, moreover, a significant shift from IgA2 to IgA1 production, the latter subclass being less resistant to proteolytic degradation. These changes--together with activation of mucosal macrophages and a dramatic increase of IgG-producing cells--may reflect local establishment of a second defense line which, however, is unsuccessful in its attempt to eliminate antigens derived from the indigenous microbial flora. Such a 'frustrated' local humoral immune system results in altered immunological homeostasis and jeopardized mucosal integrity. Complement activation observed in relation to epithelium-bound IgG1 in ulcerative colitis indicates, moreover, that the surface epithelium is subjected to immunological attack by an autoimmune reaction. These luminal deposits regularly contain terminal cytotoxic complement, and often also C3b as a sign of persistent activation. Comparison of identical twins, discordant with regard to ulcerative colitis, suggests that the markedly skewed local IgG1 response seen in this IBD entity may be genetically determined. The initial event(s) eliciting B-cell driven immunopathology in IBD remains unknown. Abrogation of oral tolerance to certain antigens from commensal bacteria has been suggested as a putative early mechanism, and lymphoid neogenesis and hyperplasia in the lesions most likely signify massive microbial overstimulation of the local B-cell system. Such ectopic lymphoid microcompartments may contribute substantially to the proinflammatory systemic-type of B-cell responses occurring in established IBD lesions.
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Affiliation(s)
- Per Brandtzaeg
- Laboratory for Immunohistochemistry and Immunopathology (LIIPAT), Institute of Pathology, University of Oslo, Norway
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Kovvali G, Das KM. Molecular mimicry may contribute to pathogenesis of ulcerative colitis. FEBS Lett 2005; 579:2261-6. [PMID: 15848155 DOI: 10.1016/j.febslet.2005.02.073] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2004] [Revised: 02/07/2005] [Accepted: 02/15/2005] [Indexed: 01/08/2023]
Abstract
Ulcerative colitis (UC) is a chronic inflammatory bowel disease with mucosal inflammation and ulceration of the colon. There seems to be no single etiological factor responsible for the onset of the disease. Autoimmunity has been emphasized in the pathogenesis of UC. Perinuclear anti-neutrophil cytoplasmic antibodies (pANCA) are common in UC, and recently two major species of proteins immunoreactive to pANCA were detected in bacteria from the anaerobic libraries. This implicates colonic bacterial protein as a possible trigger for the disease-associated immune response. Autoantibodies and T-cell response against human tropomyosin isoform 5 (hTM5), an isoform predominantly expressed in colon epithelial cells, were demonstrated in patients with UC but not in Crohn's colitis. We identified two bacterial protein sequences in NCBI database that have regions of significant sequence homology with hTM5. Our hypothesis is that molecular mimicry may be responsible for the pathogenesis of UC.
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Affiliation(s)
- Gopala Kovvali
- UMDNJ-Robert Wood Johnson Medical School, Crohn's and Colitis Center of New Jersey, New Brunswick, 08903, USA.
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Biancone L, Palmieri G, Lombardi A, Colantoni A, Tonelli F, Das KM, Pallone F. Tropomyosin expression in the ileal pouch: a relationship with the development of pouchitis in ulcerative colitis. Am J Gastroenterol 2003; 98:2719-26. [PMID: 14687823 DOI: 10.1111/j.1572-0241.2003.08719.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Human tropomyosin isoform 5 (hTM5) is a cytoskeletal protein expressed in normal epithelial cells, predominantly in the colon. An autoimmune response toward hTM5 has been reported in ulcerative colitis (UC). Whether hTM5 expression in the ileum is involved in pouchitis is unknown. We assessed hTM5 expression on ileal epithelial cells at surgery and subsequently on development of pouchitis in UC. METHODS In a prospective longitudinal study, 28 UC patients undergoing ileal pouch procedures were included. Biopsy samples were taken from the rectum at surgery, as well as from the ileal pouch at surgery and at 6 months. The specimens were stained by immunoperoxidase using the anti-hTM5 monoclonal antibody CG3. Pouchitis was assessed by the Pouchitis Disease Activity Index and hTM5 expression on a scale of 0-3. RESULTS At surgery, in rectal samples, hTM5 expression was strong in all epithelial cells including the luminal surface, whereas in ileal samples hTM5 was not expressed or focally expressed only in the goblet cells. At 6 months, the ileum was found to have undergone morphological changes, becoming similar to the colon and showing shortening or reduced number of villi. These changes were associated with a diffuse hTM5 staining in the goblet cells and in the nongoblet epithelial cells lining the crypts and the lumen. The hTM5 score was related to the Pouchitis Disease Activity Index at 6 months (r = 0.82; p = 0.01). CONCLUSIONS Expression of hTM5 shows a different pattern in the ileal pouch in UC after surgery. This event is associated with morphological changes of the ileum toward colonic epithelium, related to the development of pouchitis.
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Affiliation(s)
- Livia Biancone
- Cattedra di Gastroenterologia, Dipartamento de Medicina Interna, and Center of Excellence for the Study of the Genomic Risk of Complex Multifactorial Diseases, Università di Roma Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
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Biancone L, Monteleone I, Del Vecchio Blanco G, Vavassori P, Pallone F. Resident bacterial flora and immune system. Dig Liver Dis 2002; 34 Suppl 2:S37-43. [PMID: 12408438 DOI: 10.1016/s1590-8658(02)80162-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The "controlled inflammation" of the normal human gut is a closely controlled phenomenon and any change in the cell type number and/or functions, including the release of soluble mediators can lead to an "uncontrolled" inflammation. The physiological inflammation in the human gut plays a crucial role in maintaining a local immune response that is appropriate, efficiently protective and which respects the gut structure and function. The intestinal mucosa represents a considerable proportion of the human immune system. Disregulation of the mucosal immune response can switch a "controlled" toward an "uncontrolled" intestinal inflammation. A key role in the maintenance of an adequate balance between antigenic stimulation and host immune response is played by the immunoregulatory molecules released by activated immunocytes in the human gut. The role of the host immune system in the maintenance of an adequate balance between luminal antigens, including the resident bacterial flora and host immune response, is strongly supported by animal models of uncontrolled intestinal inflammation. Besides the aetiology of inflammatory bowel disease, luminal antigens (including food, viral and bacterial antigens) contribute to the maintenance of the inflammatory process in inflammatory bowel disease, by stimulating the immunocompetent cells in the intestinal mucosa. Of the luminal antigens, the resident bacterial flora seems to play a major role in the development of animal models of "uncontrolled" intestinal inflammation. Recent evidence also suggest that bacterial flora can modulate the function of the intestinal mucosal cells. These observations support the role of the intestinal bacterial flora in the induction of an uncontrolled inflammation in the human gut, leading to tissue damage. Probiotics, defined as living micro-organisms which, when taken in appropriate amounts, improve the health status, have been proposed in the treatment of inflammatory bowel disease, but their mechanisms of action still remain to be fully elucidated.
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Affiliation(s)
- L Biancone
- Gastroenterology Unit, Department of Internal Medicine, University of Rome Tor Vergata, Italy.
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Biancone L, Palmieri G, Lombardi A, Vavassori P, Monteleone I, Del Vecchio Blanco G, Colantoni A, Spagnoli L, Tonelli F, Pallone F. Cytoskeletal proteins and resident flora. Dig Liver Dis 2002; 34 Suppl 2:S34-6. [PMID: 12408437 DOI: 10.1016/s1590-8658(02)80161-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Recent observations demonstrate that enteropathogenetic and enterohaemorrhagic bacteria, as well as other non enteropathogenetic bacteria (Listeria, Coxiella Burnetii), may subvert the host cell cytoskeleton. Models from enteropathogenic bacteria demonstrate that cytoskeletal proteins are required for bacteria binding to the enterocytes and that they play a role in the immune response of the host to intestinal bacteria. The cytoskeletal protein family Tropomyosins is present in all eukaryotic cells, with multiple isoforms regulated by multiple genes. Of the different Tropomyosin isoforms, TM5 has been shown to be expressed in colonic and jejunal epithelial cells, while TM1 in colonic and jejunal smooth muscle. In vitro studies have shown the presence of serum and mucosal IgG against TM5 in almost two thirds of patients with ulcerative colitis, suggesting: a. a possible autoimmune response to Tropomyosin in these patients; b. the hypothesis that the development of pouchitis may be related to the expression of TM5 in the ileal pouch; c. the use of probiotics in the treatment of pouchitis. Overall, the new expression of cytoskeletal proteins on the cell surface appears to be possibly induced by several mechanisms, including intestinal bacteria and apoptosis. The expression of cytoskeletal proteins on the cell surface may induce tolerance or autoimmune response on target cells. Further investigations are, however needed on the possible role of cytoskeletal proteins in human diseases.
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Affiliation(s)
- L Biancone
- Chair of Gastroenterology, Tor Vergata University of Rome, Italy.
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20
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Lin JLC, Geng X, Bhattacharya SD, Yu JR, Reiter RS, Sastri B, Glazier KD, Mirza ZK, Wang KK, Amenta PS, Das KM, Lin JJC. Isolation and sequencing of a novel tropomyosin isoform preferentially associated with colon cancer. Gastroenterology 2002; 123:152-62. [PMID: 12105844 DOI: 10.1053/gast.2002.34154] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND & AIMS Nonmuscle human tropomyosin (hTM) isoforms have distinct functions and may play important roles in various disease processes. METHODS In an attempt to identify colon epithelial tropomyosin isoform, a complementary DNA library prepared from a human colon cancer cell line T84 was screened by an oligonucleotide probe complementary to messages of all known hTM isoforms. A novel clone called TC22 was obtained. The amino acid sequence of TC22 isoform is identical to isoform 5 (hTM5) apart from the C terminal domain, amino acids 222-247 coding the exon 9. RESULTS Northern blot analysis showed that TC22 message is expressed in transformed epithelial cell lines and tumor tissues but not in normal epithelial cells. We developed a monoclonal antibody specific to TC22 isoform (TC22-4). By Western blot and immunoperoxidase assays, we analyzed 105 colonic specimens (fresh frozen and formalin fixed) from 96 patients with colon polyps (hyperplastic) or adenomas with or without dysplasia and cancer. Twenty-one of 22 (95%) of colon cancer specimens showed the presence of TC22, compared with only 1 of the 17 normal colon specimens and none of the 13 hyperplastic polyps (P < 0.0001). As assayed by immunoperoxidase staining, TC22 expression progressively increased in benign adenomatous polyps (35%) and polyps with mild and severe dysplasia (57% and 100%, respectively). CONCLUSIONS We cloned and sequenced a novel hTM isoform, TC22, which is strongly associated with colonic neoplasia and carcinoma. TC22 may provide a useful biomarker for surveillance of colon cancer.
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Affiliation(s)
- Jenny L-C Lin
- Department of Biological Sciences, University of Iowa, Iowa City, Iowa, USA
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Su CG, Judge TA, Lichtenstein GR. Extraintestinal manifestations of inflammatory bowel disease. Gastroenterol Clin North Am 2002; 31:307-27. [PMID: 12122740 DOI: 10.1016/s0889-8553(01)00019-x] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Numerous extraintestinal diseases have been associated with IBD. The role of the gastrointestinal tract in host response to the foreign antigens present in the gut makes the enteric immune system highly susceptible to any external perturbation to the system. Dysregulation of the enteric immune response results in pathology in various organs outside of the gut. The site-specific manifestations of this immune response are not understood fully. Better understanding of the pathogenesis of IBD and the complex interactions between the gut immune system and the extraintestinal systems would provide insights into the development of many of these extraintestinal manifestations. Much is unknown about the presence of cardiac, pulmonary, and hematologic diseases in patients with IBD. True association or coincidental presence of the diseases in these organ systems with IBD requires better delineation. An important consideration in all patients with IBD presenting with extraintestinal manifestations should be a careful search for medication-related complications.
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Affiliation(s)
- Chinyu G Su
- Gastroenterology Division, Hospital of the University of Pennsylvania, University of Pennsylvania School of Medicine, 3-Ravdin Building, 3400 Spruce Street, Philadelphia, PA 19104-4283, USA
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Taniguchi M, Geng X, Glazier KD, Dasgupta A, Lin JJ, Das KM. Cellular immune response against tropomyosin isoform 5 in ulcerative colitis. Clin Immunol 2001; 101:289-95. [PMID: 11726221 DOI: 10.1006/clim.2001.5133] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We have reported an autoantibody response in ulcerative colitis (UC) against human tropomyosin isoform 5 (hTM5), the predominant colonic epithelial cell hTM isoform. In this report, we determined the number of IFN-gamma-secreting cells (spot-forming cells, SFC) against hTM5 by an enzyme-linked immunospot (ELISPOT) assay. Another cytoskeletal protein, caldesmon, CaD40, was used as a control antigen. Peripheral blood mononuclear cells were separated by a Ficoll density gradient from 28 patients with UC, 13 patients with Crohn's disease (CD), and 9 healthy subjects (HS). The mean (+/-SEM) SFC values against hTM5 in UC, CD, and HS were 48.8 +/- 8.1, 18.6 +/- 4.6, and 20.8 +/- 8.6, respectively. The value in UC was significantly higher than those in CD (P < 0.005) and HS (P < 0.025). SFC values in CD did not differ from those in HS. None of the 50 samples (except 1 UC) reacted to the CaD40 antigen. This study demonstrates, for the first time, a defined colon epithelial cell antigen, hTM5, that is capable of inducing a significant T cell response in UC but not in CD.
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Affiliation(s)
- M Taniguchi
- Crohn's and Colitis Center of New Jersey, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA
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Abstract
Crohn disease and ulcerative colitis are caused by an excessive immune-inflammatory reaction in the intestinal wall. Analysis of the types of immune response ongoing in the inflamed intestine has revealed that in Crohn disease there is predominantly a T helper cell type 1 response, with exaggerated production of interleukin (IL)-12 and interferon-gamma, whereas in ulcerative colitis the lesion seems to be more of an antibody-mediated hypersensitivity reaction. Despite these differences, downstream inflammatory events are probably similar in both conditions. In both Crohn disease and ulcerative colitis there is an increased synthesis of proinflammatory cytokines, including IL-1beta, IL-6, IL-8, IL-16, and tumor necrosis factor-alpha accompanying the influx of nonspecific inflammatory cells into the mucosa. These cytokines contribute to the tissue damage either directly or indirectly by enhancing the production of matrix metalloproteinases and growth factors, which produce ulceration as well as mucosal repair.
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Affiliation(s)
- F Pallone
- Department of Internal Medicine, Universita' di Roma Tor Vergata, Rome, Italy.
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Oshitani N, Hato F, Jinno Y, Sawa Y, Nakamura S, Matsumoto T, Seki S, Kitagawa S, Arakawa T. IgG subclasses of anti Saccharomyces cerevisiae antibody in inflammatory bowel disease. Eur J Clin Invest 2001; 31:221-5. [PMID: 11264649 DOI: 10.1046/j.1365-2362.2001.00798.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Elevation of serum anti Saccharomyces cerevisiae antibody (ASCA) has been reported in patients with Crohn's disease. We analysed the subclasses of Immunoglobulin (Ig) G reaction in ASCA in sera from patients with inflammatory bowel disease, healthy controls, and patients with intestinal Behçet's disease. Serum samples were obtained from 29 patients with Crohn's disease, 30 patients with ulcerative colitis, 7 patients with intestinal Behçet's disease, and 12 healthy controls. Serum IgG subclasses IgG1, IgG2, IgG3, and IgG4 of ASCA were analysed using ELISA. IgG4 ASCA was significantly increased in patients with inflammatory bowel disease. In patients with intestinal Behçet's disease, IgG1, IgG3, and IgG4 ASCA were increased. Differential responses, in terms of subclasses in ASCA, were found in patients with inflammatory bowel disease and patients with intestinal Behçet's disease, which may represent different pathophysiologies of these intestinal inflammatory diseases.
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Affiliation(s)
- N Oshitani
- Third Department of Internal Medicine, Osaka City University Medical School, 1-4-3, asahi-machi, abeno-ku, Osaka 545-8585, Japan
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Parrello T, Monteleone G, Cucchiara S, Monteleone I, Sebkova L, Doldo P, Luzza F, Pallone F. Up-regulation of the IL-12 receptor beta 2 chain in Crohn's disease. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2000; 165:7234-9. [PMID: 11120856 DOI: 10.4049/jimmunol.165.12.7234] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Crohn' s disease (CD) is a chronic intestinal inflammatory disorder characterized by aberrant mucosal Th1 cell activation and production of IL-12, the major Th1-driving factor. The T cell response to IL-12 is dependent on the expression of a specific receptor composed of two subunits, termed IL-12Rbeta1 and IL-12Rbeta2. The content of IL-12Rbeta2, as measured at the mRNA level, is crucial in regulating Th1 differentiation. In this study we therefore investigated IL-12Rbeta2 RNA transcripts in CD. IL-12Rbeta2 expression was increased in active CD as well as Helicobacter pylori (HP)-associated gastritis and Salmonella colitis compared with that in inactive CD, ulcerative colitis, noninflammatory controls, and celiac disease. In contrast, IL-12Rbeta1 transcripts were expressed at comparable levels in all samples. In CD, IL-12Rbeta2 expression strictly correlated with tyrosine phosphorylation of STAT4, a key component of the IL-12-dependent Th1 polarization. This was associated with a pronounced expression of IFN-gamma. Transcripts for IL-12/p40 were detected in CD, HP-positive, and Salmonella colitis patients, but not in celiac disease, indicating that IL-12Rbeta2 up-regulation occurs only in IL-12-associated Th1 gastrointestinal diseases. Finally, we showed that stimulation of lamina propria mononuclear cells with IL-12 enhanced IL-12Rbeta2, suggesting that IL-12 regulates IL-12Rbeta2 expression in human gastrointestinal mucosa. The data show that the signaling pathway used by IL-12 to induce Th1 differentiation is increased at the site of disease in CD, further supporting the view that IL-12/IL-12R signals contribute to the inflammatory response in this condition.
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Affiliation(s)
- T Parrello
- Dipartimento di Medicina Sperimentale, Università Magna Graecia di Catanzaro, Catanzaro, Italy
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Monteleone G, MacDonald TT. Manipulation of cytokines in the management of patients with inflammatory bowel disease. Ann Med 2000; 32:552-60. [PMID: 11127933 DOI: 10.3109/07853890008998835] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In recent years, new concepts have been formulated for the therapeutic management of the intractable forms of Crohn's disease and ulcerative colitis, the two major forms of inflammatory bowel disease. These advances are based largely on new insights into the immune-inflammatory events occurring in the gut of these patients. Analysis of the types of immune response ongoing in the inflamed intestine has revealed that in Crohn's disease there is predominantly a T-helper cell type 1 response, with exaggerated production of interleukin (IL)-12 and interferon (IFN)-gamma, whereas in ulcerative colitis the lesion seems more of an antibody-mediated hypersensitivity reaction. Despite these differences, downstream inflammatory events are the same in both conditions. In both Crohn's disease and ulcerative colitis mucosa, IL-1gamma, IL-6, IL-8 and tumour necrosis factor (TNF)-alpha are produced in excess, and the production of free radicals accompanying the influx of nonspecific inflammatory cells into the mucosa is above the normal range. Strategies aimed at inhibiting T-cell responses are therefore more relevant in Crohn's disease, whereas, in theory at least, inhibition of downstream inflammatory processes should be therapeutic in both Crohn's disease and ulcerative colitis. This review seeks to summarize studies in which anticytokine antibodies, cytokines or cytokine-modifying agents have been used in the treatment of either Crohn's disease or ulcerative colitis.
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Affiliation(s)
- G Monteleone
- Centre for Infection, Allergy, Inflammation and Repair, University of Southampton School of Medicine, Southampton General Hospital, UK
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Kesari KV, Yoshizaki N, Geng X, Lin JJ, Das KM. Externalization of tropomyosin isoform 5 in colon epithelial cells. Clin Exp Immunol 1999; 118:219-27. [PMID: 10540182 PMCID: PMC1905432 DOI: 10.1046/j.1365-2249.1999.01046.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Ulcerative colitis (UC) is associated with autoantibody response to a cytoskeletal protein, human tropomyosin (hTM) isoform-5 (hTM5). Because hTM5 is an intracellular protein, it may remain inaccessible to the autoantibodies. Therefore, we have investigated the possibility of externalization of hTM5 in colon epithelial cells. Freshly isolated colonic and small intestinal epithelial cells and LS-180 colon cancer cell line were examined for surface expression of hTM5 by flow cytometric analysis using hTM isoform-specific MoAbs. The extracellular release of hTM5 was determined by Western blot and radioimmunoprecipitation analyses. Physical association of hTM5 with a membrane-associated colon epithelial protein (CEP) was examined by co-immunoprecipitation of hTM5 with anti-CEP MoAb, and CEP with anti-hTM5 MoAb. Cell surface expression of hTM5 was observed in colonic epithelial and LS-180 cells but not in small intestinal epithelial cells. LS-180 cells spontaneously released hTM5 as well as CEP into the culture medium that was significantly stimulated by a calcium ionophore, A23187, but inhibited by phorbol-12-myristate-13-acetate, monensin and methylamine. Co-immunoprecipitation experiments revealed that hTM5 forms a complex with CEP. We conclude that hTM5 is externalized in colon but not in small intestinal epithelial cells. The physical association of hTM5 with CEP suggests a possible chaperone function of CEP in the transport of hTM5, a putative target autoantigen in UC.
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Affiliation(s)
- K V Kesari
- Crohn's and Colitis Center of New Jersey and Division of Gastroenterology and Hepatology, Department of Medicine, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, NJ 08903, USA
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Monteleone G, Trapasso F, Parrello T, Biancone L, Stella A, Iuliano R, Luzza F, Fusco A, Pallone F. Bioactive IL-18 Expression Is Up-Regulated in Crohn’s Disease. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.163.1.143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
An imbalance of immunoregulatory factors is believed to contribute to uncontrolled mucosal Th1 cell activation in Crohn’s disease (CD). IL-18, a macrophage-like cell-derived cytokine, is involved in Th1 clone development, and IFN-γ production. Therefore, IL-18 expression was investigated in CD. Whole mucosal intestinal tissue and lamina propria mononuclear cells (LPMC) of 12 CD and 9 ulcerative colitis (UC) patients and 15 non-inflammatory bowel disease (IBD) controls were tested for IL-18 by semiquantitative RT-PCR and Western blot analysis. Transcripts for IL-18 were found in all samples tested. However, increased IL-18 mRNA accumulation was detected in both mucosal and LPMC samples from CD in comparison to UC and controls. In CD, transcripts for IL-18 were more abundant in the mucosal samples taken from involved areas. An 18-kDa band consistent with mature IL-18 was predominantly found in CD mucosal samples. In mucosal samples from non-IBD controls, IL-18 was present as a 24-kDa polypeptide. Consistently, active IL-1β-converting enzyme (ICE) subunit (p20) was expressed in samples from either CD or UC, whereas, in colonic mucosa from non-IBD controls, ICE was synthesized as precursor (p45) only. To confirm that IL-18 produced in CD tissue was functionally active, CD LPMC were treated with a specific IL-18 antisense oligonucleotide. In these cultures, IL-18 down-regulation was accompanied by a decrease in IFN-γ expression. In aggregate, our data indicate that IL-18 up-regulation is a feature of CD and suggest that IL-18 may contribute to the local immunoinflammatory response in CD.
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Affiliation(s)
- Giovanni Monteleone
- *Dipartimento di Medicina Sperimentale, Universita’ di Catanzaro, Catanzaro, Italy; and
| | - Francesco Trapasso
- *Dipartimento di Medicina Sperimentale, Universita’ di Catanzaro, Catanzaro, Italy; and
| | - Tiziana Parrello
- *Dipartimento di Medicina Sperimentale, Universita’ di Catanzaro, Catanzaro, Italy; and
| | - Livia Biancone
- †Dipartimento di Medicina Interna, Universita’ di Roma Tor Vergata, Rome, Italy
| | - Antonella Stella
- *Dipartimento di Medicina Sperimentale, Universita’ di Catanzaro, Catanzaro, Italy; and
| | - Rodolfo Iuliano
- *Dipartimento di Medicina Sperimentale, Universita’ di Catanzaro, Catanzaro, Italy; and
| | - Francesco Luzza
- *Dipartimento di Medicina Sperimentale, Universita’ di Catanzaro, Catanzaro, Italy; and
| | - Alfredo Fusco
- *Dipartimento di Medicina Sperimentale, Universita’ di Catanzaro, Catanzaro, Italy; and
| | - Francesco Pallone
- †Dipartimento di Medicina Interna, Universita’ di Roma Tor Vergata, Rome, Italy
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Bregenholt S, Brimnes J, Reimann J, Claesson MH. Accumulation of immunoglobulin-containing cells in the gut mucosa and presence of faecal immunoglobulin in severe combined immunodeficient (scid) mice with T cell-induced inflammatory bowel disease (IBD). Clin Exp Immunol 1998; 114:19-25. [PMID: 9764598 PMCID: PMC1905079 DOI: 10.1046/j.1365-2249.1998.00691.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Scid mice transplanted either with a gut wall graft or with low numbers of purified CD4+ T cells from immunocompetent syngeneic donor mice show clinical signs of IBD 3-4 months post-transplantation. The disease is mediated by mucosa-infiltrating CD4+ TCR alphabeta+ T cells. The pathology of 52 individual colon segments obtained from 20 gut wall- or CD4+ T cell-transplanted diseased scid mice was evaluated by histology and the numbers of infiltrating immunoglobulin-containing cells were determined. In particular, cells positive for IgM, IgA and non-inflammatory immunoglobulin isotypes such as IgG1 and IgG2b were found to accumulate in colon segments displaying the most severe histopathology, including inflammatory cellular infiltration, epithelial hyperplasia and ulcerative lesions. Compared with colon segments of normal C.B-17 mice, the lesional scid colon shows increased levels of cells positive for the IgG classes. Faecal extracts of the CD4+ T cell-transplanted scid mice revealed the presence of all six murine immunoglobulin isotypes. Disease progression was accompanied by an increased level of excreted IgM and IgG3 and decreased levels of IgA. It is concluded that locally secreted immunoglobulins may play an immunomodulating role in the pathological changes observed in the present model of T cell-induced inflammatory bowel disease.
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Affiliation(s)
- S Bregenholt
- Department of Medical Anatomy, The Panum Institute, University of Copenhagen, Denmark
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30
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Biancone L, Monteleone G, Marasco R, Pallone F. Autoimmunity to tropomyosin isoforms in ulcerative colitis (UC) patients and unaffected relatives. Clin Exp Immunol 1998; 113:198-205. [PMID: 9717968 PMCID: PMC1905040 DOI: 10.1046/j.1365-2249.1998.00610.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/1998] [Indexed: 12/17/2022] Open
Abstract
Autoimmunity to cytoskeletal protein tropomyosin (TM) has been demonstrated in UC. However, the TM isoforms involved in this IgG-mediated autoimmune response in UC and the possible presence of serum IgG antibodies against TM (hTMs IgG) in unaffected UC relatives are unknown. The aim of this study was to investigate the human TM (hTM) isoforms recognized by serum IgG from UC and to explore whether hTM IgG antibodies are present in healthy UC relatives. We studied 33 UC patients with 58 unaffected relatives, 31 Crohn's disease (CD) patients with 31 unaffected relatives and 20 controls (C). Serum IgG against four recombinant hTM isoforms (hTM1, 2, 3, 5) were tested by ELISA. p-ANCA were tested by ELISA and immunofluorescence. Serum hTM1 and hTM5 IgG were higher in UC patients than in CD and C (P<0.005). Among UC patients 52% were seropositive for hTM1 and 64% for hTM5 (P<0.001 versus CD and C). In UC, hTM5 IgG were higher in p-ANCA+ than in ANCA- patients (P=0.04). In UC relatives hTM1 IgG were higher than in CD relatives and C (P<0.01). UC relatives were more frequently seropositive for hTM1 than hTM5 IgG (P=0.001). while probands were more frequently seropositive for hTM5 IgG (P=0.008). We conclude that autoimmunity to hTMI and hTM5 is a feature of UC, while hTM1 IgG differentiate UC relatives from controls. A genetic susceptibility to immune recognition of hTM isoforms in UC is suggested.
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Affiliation(s)
- L Biancone
- Clinica Medica 2, Università La Sapienza, Roma, Italy
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31
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Casellas F, Borruel N, Papo M, Guarner F, Antolín M, Videla S, Malagelada JR. Antiinflammatory effects of enterically coated amoxicillin-clavulanic acid in active ulcerative colitis. Inflamm Bowel Dis 1998; 4:1-5. [PMID: 9552221 DOI: 10.1097/00054725-199802000-00001] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The inflammatory activity of colonic mucosal lesions may be stimulated by intraluminal bacteria. Our aim was to investigate whether administration of broad-spectrum antibiotics decreases inflammatory activity in ulcerative colitis. To this end, we performed a randomized, 5-day study with either oral enterically coated amoxicillin-clavulanic acid (1 g + 250 mg, t.i.d.); i.v. methylprednisolone (40 mg/day) and oral placebo (t.i.d.); or both i.v. methylprednisolone and oral amoxicillin-clavulanic acid as above, in 30 patients with clinically active ulcerative colitis. Before and after 5 days of treatment, intestinal inflammation was assessed by the quantification of mucosal release of eicosanoids and interleukin-8 by rectal dialysis in each patient. Breath H2 excretion after oral lactulose was determined as an index of metabolic activity of colonic flora. The total release of (IL-8) interleukin-8 and eicosanoids significantly decreased in patients treated with antibiotic or steroids and antibiotic. Antibiotic treatment, but not steroids, markedly inhibited breath H2 excretion. In conclusion, short-term treatment with enteric-coated amoxicillin-clavulanic acid decreases the intraluminal release of IL-8 and other inflammatory mediators.
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Affiliation(s)
- F Casellas
- Digestive System Research Unit, Hospital General Vall d'Hebron, Barcelona, Spain
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32
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Brandtzaeg P, Haraldsen G, Rugtveit J. Immunopathology of human inflammatory bowel disease. SPRINGER SEMINARS IN IMMUNOPATHOLOGY 1997; 18:555-89. [PMID: 9144870 DOI: 10.1007/bf00824058] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- P Brandtzaeg
- Laboratory for Immunohistochemistry and Immunopathology (LIIPAT), University of Oslo, National Hospital, Rikshospitalet, Norway
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Hassan T, Kanisawa Y, Meyers S, Dasgupta A, Das KM. Expression of a unique protein on colon cancer cells that reacts with a novel monoclonal antibody and ulcerative colitis serum. Clin Exp Immunol 1995; 100:457-62. [PMID: 7774056 PMCID: PMC1534476 DOI: 10.1111/j.1365-2249.1995.tb03722.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
We earlier developed a MoAb, 7E12H12 (IgM isotype), against a protein present in normal colonic epithelial cells. To examine if 7E12H12-reactive protein is expressed in colon cancer cells and is recognized by ulcerative colitis (UC)-associated autoantibody, we investigated several colon cancer cell lines. 7E12H12 reactivity against the cells was examined by indirect immunofluorescence assay and whole cell ELISA against six colon cancer cell lines HT-29, LoVo, COLO 205, DLD-1, LS 180 and SW 1116. A competitive ELISA was developed using 7E12H12 MoAb and patients' serum to examine the cross-reactive antibodies in the serum. Among the six colon cancer cell lines only LS 180, DLD-1 and SW 1116 reacted with 7E12H12 MoAb, while others did not. The mean (+/- s.e.m.) inhibition of the binding of 7E12H12 MoAb to LS 180 cells by UC serum (n = 51) was 42 +/- 2.1%, whereas in normal subjects (n = 17) it was 14 +/- 2.6%, in Crohn's disease (n = 19) it was 15.3 +/- 2.5%, in infectious diarrhoea (n = 10) it was 11% +/- 3%, and in systemic lupus erythematosus (n = 10) it was 2% +/- 0.6%. The inhibition by the UC group was significantly (P < 0.001 - < 0.0001) higher than any of the non-UC groups, and this inhibition was mainly by IgG1 antibody. The protein in the specific colon cancer cells recognized by the 7E12H12 MoAb cross-reacts with UC-IgG1 antibody and may provide an in vitro system to examine the autoimmune mechanisms in UC.
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Affiliation(s)
- T Hassan
- Division of Gastroenterology, UMDNJ-Robert Wood Johnson Medical School, New Brunswick 08903, USA
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