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Tanaka R, Imai J, Tsugawa H, Eap KB, Yazawa M, Kaneko M, Ohno M, Sugihara K, Kitamoto S, Nagao-Kitamoto H, Barnich N, Matsushima M, Suzuki T, Kagawa T, Nishizaki Y, Suzuki H, Kamada N, Hozumi K. Adherent-invasive E. coli - induced specific IgA limits pathobiont localization to the epithelial niche in the gut. Front Microbiol 2023; 14:1031997. [PMID: 36910191 PMCID: PMC9995611 DOI: 10.3389/fmicb.2023.1031997] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 02/06/2023] [Indexed: 02/25/2023] Open
Abstract
Background and aim Adherent-invasive E. coli (AIEC) has been identified as a pathobiont associated with Crohn's disease (CD), that prefers to grow in inflammatory conditions. Although the colonization by AIEC is implicated in the progression of the disease and exacerbates inflammation in murine colitis models, the recognition and response of host immunity to AIEC remains elusive. Methods Antibiotic treated female C57BL/6 mice were inoculated by commensal E. coli and LF82 AIEC strains. Luminal-IgA fractions were prepared from feces and their binding to AIEC and other strains was assessed to confirm specificity. IgA binding to isogenic mutant strains was performed to identify the functional molecules that are recognized by AIEC specific IgA. The effect of IgA on epithelial invasion of LF82 strain was confirmed using in vitro invasion assay and in vivo colonization of the colonic epithelium. Results Persistent colonization by AIEC LF82 induced secretion of luminal IgA, while commensal E. coli strain did not. Induced anti-LF82 IgA showed specific binding to other AIEC strains but not to the commensal, non-AIEC E. coli strains. Induced IgA showed decreased binding to LF82 strains with mutated adhesin and outer membrane proteins which are involved in AIEC - epithelial cell interaction. Consistently, LF82-specific IgA limited the adhesion and invasion of LF82 in cultured epithelial cells, which seems to be required for the elimination in the colonic epithelium in mice. Conclusion These results demonstrate that host immunity selectively recognizes pathobiont E. coli, such as AIEC, and develop specific IgA. The induced IgA specific to pathobiont E. coli, in turn, contributes to preventing the pathobionts from accessing the epithelium.
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Affiliation(s)
- Rika Tanaka
- Department of Immunology, Tokai University School of Medicine, Isehara, Japan
| | - Jin Imai
- Division of Gastroenterology, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan.,Department of Clinical Health Science, Tokai University School of Medicine, Isehara, Japan
| | - Hitoshi Tsugawa
- Transkingdom Signaling Research Unit, Division of Host Defense, Tokai University School of Medicine, Isehara, Japan
| | - Karl Bil Eap
- Department of Immunology, Tokai University School of Medicine, Isehara, Japan
| | - Masaki Yazawa
- Department of Immunology, Tokai University School of Medicine, Isehara, Japan
| | - Motoki Kaneko
- Division of Gastroenterology, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan
| | - Masashi Ohno
- Division of Gastroenterology, Shiga University of Medical Science, Otsu, Japan
| | - Kohei Sugihara
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States
| | - Sho Kitamoto
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States.,WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
| | - Hiroko Nagao-Kitamoto
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States.,WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
| | - Nicolas Barnich
- UMR1071 Inserm/University Clermont Auvergne, INRAE USC2018, M2iSH, CRNH Auvergne, Clermont-Ferrand, France
| | - Masashi Matsushima
- Division of Gastroenterology, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan
| | - Takayoshi Suzuki
- Division of Gastroenterology, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan
| | - Tatehiro Kagawa
- Division of Gastroenterology, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan
| | - Yasuhiro Nishizaki
- Department of Clinical Health Science, Tokai University School of Medicine, Isehara, Japan
| | - Hidekazu Suzuki
- Division of Gastroenterology, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan
| | - Nobuhiko Kamada
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States.,WPI Immunology Frontier Research Center, Osaka University, Suita, Japan
| | - Katsuto Hozumi
- Department of Immunology, Tokai University School of Medicine, Isehara, Japan
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