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Engelhart MJ, Glowacki RWP, Till JM, Harding CV, Martens EC, Ahern PP. The NQR Complex Regulates the Immunomodulatory Function of Bacteroides thetaiotaomicron. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2023; 211:767-781. [PMID: 37486212 PMCID: PMC10527448 DOI: 10.4049/jimmunol.2200892] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 06/26/2023] [Indexed: 07/25/2023]
Abstract
The gut microbiome and intestinal immune system are engaged in a dynamic interplay that provides myriad benefits to host health. However, the microbiome can also elicit damaging inflammatory responses, and thus establishing harmonious immune-microbiome interactions is essential to maintain homeostasis. Gut microbes actively coordinate the induction of anti-inflammatory responses that establish these mutualistic interactions. Despite this, the microbial pathways that govern this dialogue remain poorly understood. We investigated the mechanisms through which the gut symbiont Bacteroides thetaiotaomicron exerts its immunomodulatory functions on murine- and human-derived cells. Our data reveal that B. thetaiotaomicron stimulates production of the cytokine IL-10 via secreted factors that are packaged into outer membrane vesicles, in a TLR2- and MyD88-dependent manner. Using a transposon mutagenesis-based screen, we identified a key role for the B. thetaiotaomicron-encoded NADH:ubiquinone oxidoreductase (NQR) complex, which regenerates NAD+ during respiration, in this process. Finally, we found that disruption of NQR reduces the capacity of B. thetaiotaomicron to induce IL-10 by impairing biogenesis of outer membrane vesicles. These data identify a microbial pathway with a previously unappreciated role in gut microbe-mediated immunomodulation that may be targeted to manipulate the capacity of the microbiome to shape host immunity.
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Affiliation(s)
- Morgan J. Engelhart
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH
- Center for Microbiome and Human Health, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Robert W. P. Glowacki
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Center for Microbiome and Human Health, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Jessica M. Till
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH
- Center for Microbiome and Human Health, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Clifford V. Harding
- Department of Pathology, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | - Eric C. Martens
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Philip P. Ahern
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH
- Center for Microbiome and Human Health, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
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Mihoubi E, Amroun H, Bouldjennet F, Azzouz M, Touil-Boukoffa C, Raache R, Attal N. Polymorphismes 869C> T et 915 G>C du TGF-β dans la rétinopathie du diabète de type 1 chez la population algérienne. J Fr Ophtalmol 2022; 45:908-914. [DOI: 10.1016/j.jfo.2022.02.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 02/18/2022] [Accepted: 02/21/2022] [Indexed: 10/18/2022]
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Ahmed BT, Saeed MY, Noori SH, Amin DM. TGF-β1 Gene Polymorphism and Its Correlation with Serum Level of TGF-β1 in Psoriasis Vulgaris Among Iraqi People. CLINICAL, COSMETIC AND INVESTIGATIONAL DERMATOLOGY 2020; 13:889-896. [PMID: 33262631 PMCID: PMC7699994 DOI: 10.2147/ccid.s281585] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 11/18/2020] [Indexed: 12/21/2022]
Abstract
PURPOSE Many cytokines have been implicated in the pathogenesis of psoriasis, among these the transforming growth factor-beta 1 (TGF-β1) can be endorsed by different mechanisms besides inhibiting keratinocytes proliferation. The role of genetic polymorphisms of TGF-β1 has been studied in various inflammatory diseases. Our aim is to study the correlation of TGF-β1 gene polymorphism at codon 10 and 25 with the expression of serum level of TGF-β1 in a sample of Iraqi psoriatic patients compared to the control group. MATERIALS AND METHODS A cross-sectional study involved 100 patients with psoriasis vulgaris and 50 sex- and age-matched healthy volunteers as control group. Serum and genomic DNA were prepared from peripheral blood samples. Amplification refractory mutation system-polymerase chain reaction technique (ARMS-PCR) had been applied for genotyping TGF-β1 codon 10 [rs1982073] and codon 25 [rs1800471] genetic polymorphisms. Enzyme-linked immunosorbent assay technique (ELISA) based on the sandwich principle was used for quantification of serum TGF-β1 level. Psoriasis Area and Severity Index (PASI) scoring was applied for determining the severity in psoriatic patients and classified accordingly to mild (PASI<7), moderate (PASI 7-12), severe (PASI>12) groups. RESULTS Statistically significant difference was found in TGF-β1 gene polymorphism between psoriatic patients and control group at codon 10 (T869C) polymorphism (p=0.021) and codon 25 (G915C) polymorphism (p=0.040). No significant association was detected with the mean serum TGF-β1 level, severity of the disease, disease onset, gender, history of psoriatic arthritis, and smoking in both codons. Significant lower mean serum TGF-β1 level was found among psoriatic group (192.17 ± 531.12 ng/L) compared with controls (565.89 ± 1372.30 ng/L) (p = 0.018). Relation of mean serum TGF-β1 level with the onset of the disease was statistically significant (p = 0.004), early-onset disease group was lower (105.92 ± 68.02 ng/L) compared with the late-onset disease group (450.92 ±1027.79 ng/L). The mean serum TGF-β1 level showed no significant differences with the severity of psoriasis, gender, history of psoriatic arthritis, and smoking. CONCLUSION Iraqi population showed a significant association between TGF-β1 gene polymorphism at codon 10 and 25 were with psoriasis susceptibility, and a significantly lower mean serum TGF-β1 level was detected in psoriatic patients.
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Affiliation(s)
- Bryar T Ahmed
- Department of Medicine/Dermatology, College of Medicine, University of Sulaimani, Sulaimani City, Kurdistan, Iraq
| | - Mohammad Y Saeed
- Department of Medicine/Dermatology, College of Medicine, University of Sulaimani, Sulaimani City, Kurdistan, Iraq
| | - Saman H Noori
- Department of Biochemistry, College of Medicine, University of Sulaimani, Sulaimani City, Kurdistan, Iraq
| | - Dashty M Amin
- Medical Laboratory Sciences, Komar University of Science and Technology, Sulaimani City, Kurdistan, Iraq
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Kashima S, Fujiya M, Konishi H, Ueno N, Inaba Y, Moriichi K, Tanabe H, Ikuta K, Ohtake T, Kohgo Y. Polyphosphate, an active molecule derived from probiotic Lactobacillus brevis, improves the fibrosis in murine colitis. Transl Res 2015; 166:163-75. [PMID: 25766132 DOI: 10.1016/j.trsl.2015.02.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 02/10/2015] [Accepted: 02/12/2015] [Indexed: 12/12/2022]
Abstract
Inflammatory bowel disease frequently causes intestinal obstruction because of extensive fibrosis. This study investigated whether polyphosphate (poly P), an active molecule derived from Lactobacillus brevis, could improve the fibrosis in a model of chronic colitis. In this study, dextran sodium sulfate (DSS)-induced chronic colitis models and trinitrobenzene sulfonic acid (TNBS)-induced colitis models were used as models of fibrosis. To clarify the mechanism responsible for the observed effects, Caco-2/brush border epithelial (BBE) and naive T helper lymphocyte (THP)-1 cells were treated with lipopolysaccharide (LPS) to induce inflammation. Non-cancer human colon fibroblast (CCD-18) cells were treated with transforming growth factor beta 1 (TGF-β1) to induce fibrosis. The expression levels of fibrosis- and inflammation-associated molecules were evaluated by both a Western blotting analysis and reverse transcriptase-polymerase chain reaction (RT-PCR). The histologic inflammation and fibrosis were significantly improved in the group administered poly P in both the DSS and TNBS colitis models. The levels of interleukin 1β (IL-1β) and tumor necrosis factor α (TNF-α) were significantly decreased by poly P treatment. The expression levels of TGF-β1 and collagens in the colitis mice were decreased by poly P. The LPS-induced expressions of IL-1β and TGF-β1 in Caco-2/BBE cells and of TNF-α in THP-1 cells were reduced by poly P treatment. Poly P did not affect the expression of collagens and connective tissue growth factor in the CCD-18 cells. In conclusion, poly P suppresses intestinal inflammation and fibrosis by downregulating the expression of inflammation- and fibrosis-associated molecules in the intestinal epithelium. The administration of poly P is therefore a novel option to treat fibrosis because of chronic intestinal inflammation.
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Affiliation(s)
- Shin Kashima
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Mikihiro Fujiya
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan.
| | - Hiroaki Konishi
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Nobuhiro Ueno
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Yuhei Inaba
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Kentaro Moriichi
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Hiroki Tanabe
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Katsuya Ikuta
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Takaaki Ohtake
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Yutaka Kohgo
- Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Japan
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Lankarani KB, Sivandzadeh GR, Hassanpour S. Oral manifestation in inflammatory bowel disease: a review. World J Gastroenterol 2013; 19:8571-9. [PMID: 24379574 PMCID: PMC3870502 DOI: 10.3748/wjg.v19.i46.8571] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 09/30/2013] [Accepted: 11/01/2013] [Indexed: 02/06/2023] Open
Abstract
Inflammatory bowel diseases (IBDs), including Crohn's disease (CD) and ulcerative colitis, not only affect the intestinal tract but also have an extraintestinal involvement within the oral cavity. These oral manifestations may assist in the diagnosis and the monitoring of disease activity, whilst ignoring them may lead to an inaccurate diagnosis and useless and expensive workups. Indurated tag-like lesions, cobblestoning, and mucogingivitis are the most common specific oral findings encountered in CD cases. Aphthous stomatitis and pyostomatitis vegetans are among non-specific oral manifestations of IBD. In differential diagnosis, side effects of drugs, infections, nutritional deficiencies, and other inflammatory conditions should also be considered. Treatment usually involves managing the underlying intestinal disease. In severe cases with local symptoms, topical and/or systemic steroids and immunosuppressive drugs might be used.
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The association of IL-8-251T/A polymorphism with complicated malaria in Karbi Anglong district of Assam. Cytokine 2013; 65:210-6. [PMID: 24290435 DOI: 10.1016/j.cyto.2013.11.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 10/09/2013] [Accepted: 11/01/2013] [Indexed: 01/21/2023]
Abstract
Amongst host genetic factors, cytokine gene polymorphism can be anticipated to be an important factor as qualitative, quantitative and time of secretion play an important role in disease outcome. We have investigated association of cytokine promoter SNPs with risk of Plasmodium falciparum malaria and disease severity in a case control study in malaria endemic Karbi Anglong district of Assam, India. Frequency of IL-8-251T/A (p=0.03 and p=0.01) and TGF-β1-509C/T (p=0.02 and p=0.03) was higher in malaria in comparison to control participants and non-malarial fever controls. Interestingly, a higher frequency of mutant allele of IL-10-819T/C was observed in non-malarial fever controls compared to malaria thus suggesting its role as a distinguishing marker of the two disease groups. Higher IL-8 expression and increased frequency of IL-8-251T/A in complicated malaria (p=0.002) was reported indicating its role in susceptibility to complicated malaria. In conclusion, our study suggests the role of mutant genotype of IL-8-251T/A as a marker of complicated malaria in our population. Surprisingly, decreased expression of TGF-β1 in uncomplicated malaria even in presence of high expressing mutant genotype was observed and needs to be investigated in context of the pool of activated cells producing the cytokine.
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Saxena R, Chawla YK, Verma I, Kaur J. Effect of IL-12B, IL-2, TGF-β1, and IL-4 polymorphism and expression on hepatitis B progression. J Interferon Cytokine Res 2013; 34:117-28. [PMID: 24161121 DOI: 10.1089/jir.2013.0043] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The hepatitis B virus (HBV) infection-induced chronic inflammation is considered to be the major etiological factor for HBV-related disease chronicity. Cytokines act as the key coordinators of the inflammatory responses involved in HBV disease pathogenesis. The present study assessed association among IL-12B(+1188), IL-2(-330), TGF-β1(-509), and IL-4(-590) genotypes; mRNA; and protein levels with HBV-hepatocellular carcinoma (HCC) risk in India. For this, 403 subjects (153 controls, 67 inactive HBV-carriers, 62 chronic-active HBV patients, 62 HBV-cirrhotics, and 59 HBV-HCC ssubjects) were enrolled in the study. The genotyping was carried by polymerase chain reaction (PCR)-restriction fragment length polymorphism (IL-12+1188A/C, IL-2-330T/G, and TGF-β1-509C/T), and allele specific (AS)-polymerase chain reaction (IL-4-590C/T). Enzyme-linked immunosorbent assay and reverse transcriptase-polymerase chain reaction methods were used for assessing protein and the mRNA expression, respectively, of the mentioned cytokines. The study revealed that the IL-12B(+1188) CC genotype shared a significant positive association with hepatitis, among controls. While, in the case of IL-2(-330), both the TG and GG genotypes were not significantly associated with HCC risk. The TGF-β1(-509) TT genotype acted as a potential protective factor for cirrhosis and the HCC risk, among carriers. On the contrary, the IL-4(-590) CT genotype was found to be a vital protective factor for the development of hepatitis, among carriers. Besides, IL-12B, TGF-β1, and IL-2 seem to be majorly involved in the development of HCC, while, IL-4 might be responsible for the progression of the HBV disease till cirrhosis development. These initial findings are indicative of the vital role of genotypes and/or levels of IL-12B, IL-2, IL-4, and TGF-β1 in HBV disease chronicity in Indian population.
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Affiliation(s)
- Roli Saxena
- 1 Department of Biochemistry, Postgraduate Institute of Medical Education and Research , Chandigarh, India
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Safarpour AR, Hosseini SV, Mehrabani D. Epidemiology of inflammatory bowel diseases in iran and Asia; a mini review. IRANIAN JOURNAL OF MEDICAL SCIENCES 2013; 38:140-9. [PMID: 24031103 PMCID: PMC3771215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 04/15/2013] [Accepted: 04/28/2013] [Indexed: 11/05/2022]
Abstract
The prevalence of inflammatory bowel diseases (IBDs) is set to stabilize in Western Europe and North America, as opposed to its increasing trend in developing countries in Asia. The epidemiology of IBDs in areas where the incidence and prevalence are relatively low provides an opportunity for researchers to determine the unknown aspects of them. In this review article, the PubMed and MEDLINE databases were searched from 1970 to 2012 and the epidemiological aspects assessed in Iranian articles were compared with identical subjects in other Asian countries. During this period, there were 21 documented articles on IBD epidemiology in Iran and 52 in Asia. According to the present review, CTLA-gene polymorphism and male/female ratio in ulcerative colitis (UC), incidence of extra-intestinal manifestations, extent of intestinal involvement, and family history in both UC and Crohn's disease (CD) seemed to be different between Asia and Iran. In contrast, the incidence of primary sclerosing cholangitis in IBD patients and association between NO2/CARD15 mutation and CD as C3435-T allele and UC were nearly the same. The rate of IBD has increased significantly in Iran, as has that of other Asian countries during the last decade. A thorough, well-designed, population-based, multi-regional epidemiologic study seems mandatory due to the substantial demographic and characteristic variability in IBD patients in our region.
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Affiliation(s)
- Ali Reza Safarpour
- Colorectal Research Center, Faghihi Hospital, Shiraz University of Medical Sciences, Shiraz, Iran;,Laparoscopy Research Center, Faghihi Hospital, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Seyed Vahid Hosseini
- Laparoscopy Research Center, Faghihi Hospital, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Davood Mehrabani
- Stem Cell and Transgenic Technology Research Center, Department of Pathology, Shiraz University of Medical Sciences, Shiraz, Iran
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Adibi P, Mollakhalili P, Fallah Z, Daryani NE, Ajdarkosh H, Khedmat H, Derakhshan F, Karbassi A, Ashkzari M, Tavakkoli H. Promising effect of infliximab on the extent of involvement in ulcerative colitis. JOURNAL OF RESEARCH IN MEDICAL SCIENCES : THE OFFICIAL JOURNAL OF ISFAHAN UNIVERSITY OF MEDICAL SCIENCES 2011; 16:6-15. [PMID: 21448377 PMCID: PMC3063437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2010] [Accepted: 08/29/2010] [Indexed: 11/12/2022]
Abstract
BACKGROUND Ulcerative colitis (UC) is a disabling disease with increasing incidence in Iran. In spite of combined medical therapy, some patients eventually undergo total colectomy. Infliximab has proved itself as a rescue therapy and even as an early aggressive therapy for severe extensive UC. Meantime, there are concerns about its complications. The aim of this study was to evaluate the efficacy of infliximab in Iranian refractory UC patients. METHODS This multi centric case-series study included 29 UC patients receiving two to three of the drugs prednisolone, AZT/6MP and 5ASA but yet having flare-ups. At first, the extent of colon involvement was determined by colonoscopy; then the drug was administered at baseline, 2nd week and 6th week and colonoscopy repeated afterwards. Clinical and laboratory data were also recorded. RESULTS In first endoscopy 18 patients (62%) out of 29 suffered from pancolitis and none had normal results. In second examination (done on 19 patients), one was normal and only 8 of 18 (27.6%) had pancolitis. Considering missing cases, at least in 33.3% of patients the drug has reduced the extreme extent of colon involvement. Also a wilcoxon signed ranks test revealed significant reduction of the disease extension after this treatment (p = 0.008). There were only one leucopenic and one hypotensive reactions in short term. The drug showed effectiveness in the term of disease modifying, too. CONCLUSIONS These data show the usefulness of the drug in refractory UC. Longer follow ups and controlled trials are needed.
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Affiliation(s)
- Peyman Adibi
- Associate Professor, Department of Internal Medicine, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Pejman Mollakhalili
- Fellowship, Department of Internal Medicine, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Zahra Fallah
- Research Assistant, Management of Research Affairs Unit, Vice Chancellery for Research and Technology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Nasser Ebrahimi Daryani
- Department of Gastroenterology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Hossein Ajdarkosh
- Gastrointestinal and Liver Disease Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Hossein Khedmat
- Baqiyatallah Research Center for Gastroenterology and Liver Diseases, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Faramarz Derakhshan
- Digestive Disease Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ashraf Karbassi
- Baqiyatallah Research Center for Gastroenterology and Liver Diseases, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | | | - Hamid Tavakkoli
- Department of Internal Medicine, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
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Verschoor CP, Pant SD, You Q, Schenkel FS, Kelton DF, Karrow NA. Polymorphisms in the gene encoding bovine interleukin-10 receptor alpha are associated with Mycobacterium avium ssp. paratuberculosis infection status. BMC Genet 2010; 11:23. [PMID: 20398313 PMCID: PMC2873551 DOI: 10.1186/1471-2156-11-23] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2009] [Accepted: 04/15/2010] [Indexed: 02/08/2023] Open
Abstract
Background Johne's disease is a chronic inflammatory bowel disease (IBD) of ruminants caused by Mycobacterium avium ssp. paratuberculosis (MAP). Since this pathogen has been implicated in the pathogenesis of human IBDs, the goal of this study was to assess whether single nucleotide polymorphism (SNPs) in several well-known candidate genes for human IBD are associated with susceptibility to MAP infection in dairy cattle. Methods The bovine candidate genes, interleukin-10 (IL10), IL10 receptor alpha/beta (IL10RA/B), transforming growth factor beta 1 (TGFB1), TGFB receptor class I/II (TGFBR1/2), and natural resistance-associated macrophage protein 1 (SLC11A1) were sequenced for SNP discovery using pooled DNA samples, and the identified SNPs were genotyped in a case-control association study comprised of 242 MAP negative and 204 MAP positive Holstein dairy cattle. Logistic regression was used to determine the association of SNPs and reconstructed haplotypes with MAP infection status. Results A total of 13 SNPs were identified. Four SNPs in IL10RA (984G > A, 1098C > T, 1269T > C, and 1302A > G) were tightly linked, and showed a strong additive and dominance relationship with MAP infection status. Haplotypes AGC and AAT, containing the SNPs IL10RA 633C > A, 984G > A and 1185C > T, were associated with an elevated and reduced likelihood of positive diagnosis by serum ELISA, respectively. Conclusions SNPs in IL10RA are associated with MAP infection status in dairy cattle. The functional significance of these SNPs warrants further investigation.
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Affiliation(s)
- Chris P Verschoor
- Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph, 50 Stone Rd East, Guelph, Ontario, N1G2W1, Canada
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