Cited by 49Gut microbiota and healthInflammatory Bowel DiseaseOral microbiology and periodontitis research

Patients With Inflammatory Bowel Disease Show IgG Immune Responses Towards Specific Intestinal Bacterial Genera

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Bourgonje, Arno R., Roo-Brand, Geesje, Lisotto, Paola, Sadaghian Sadabad, Mehdi, Reitsema, Rosanne D., de Goffau, Marcus C., Faber, Klaas Nico, Dijkstra, Gerard +1 more·2022·Frontiers in Immunology

Abstract

Introduction: Inflammatory bowel disease (IBD) is characterized by a disturbed gut microbiota composition. Patients with IBD have both elevated mucosal and serum levels of IgG-antibodies directed against bacterial antigens, including flagellins. In this study, we aimed to determine to which intestinal bacteria the humoral immune response is directed to in patients with IBD. Methods: Fecal and serum samples were collected from patients with IBD (n=55) and age- and sex-matched healthy controls (n=55). Fecal samples were incubated with autologous serum and IgG-coated fractions were isolated by magnetic-activated cell sorting (MACS) and its efficiency was assessed by flow cytometry. The bacterial composition of both untreated and IgG-coated fecal samples was determined by 16S rRNA-gene Illumina sequencing. Results: IgG-coated fecal samples were characterized by significantly lower microbial diversity compared to the fecal microbiome. Both in patients with IBD and controls, serum IgG responses were primarily directed to Streptococcus, Lactobacillus, Lactococcus, Enterococcus, Veillonella and Enterobacteriaceae, as well as against specific Lachnospiraceae bacteria, including Coprococcus and Dorea (all P<0.001), and to Ruminococcus gnavus-like bacteria (P<0.05). In contrast, serological IgG responses against typical commensal, anaerobic and colonic microbial species were rather low, e.g. to the Lachnospiraceae members Roseburia and Blautia, to Faecalibacterium, as well as to Bacteroides. Patients with IBD showed more IgG-coating of Streptococcus, Lactobacillus, and Lactococcus bacteria compared to healthy controls (all P<0.05). No differences in IgG-coated bacterial fractions were observed between Crohn’s disease and ulcerative colitis, between active or non-active disease, nor between different disease locations. Conclusion: The IgG immune response is specifically targeted at distinct intestinal bacterial genera that are typically associated with the small intestinal microbiota, whereas responses against more colonic-type commensals are lower, which was particularly the case for patients with IBD. These findings may be indicative of a strong immunological exposure to potentially pathogenic intestinal bacteria in concordance with relative immune tolerance against commensal bacteria.

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  • The humoral immune response to gut microorganisms includes T cell-dependent and T cell-independent memory B cell responses and can be tracked by serological reactivity to common intestinal bacteria.

    “The humoral immune response against gut microorganisms encompasses T cell-dependent and T cell-independent memory B cell responses and can be monitored by serological reactivities against prevalent intestinal bacteria113–115.”
  • In IBD faecal samples, 13-77% (mean 38%) of bacteria were IgG-coated after incubation with autologous serum.

    “Anti-IgG-based flow cytometry of faecal samples from patients with IBD revealed that 13–77% (mean 38%) of bacteria were IgG-coated after incubation with autologous serum113.”

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Authors
Bourgonje, A. R., Roo-Brand, G., Lisotto, P., Sadaghian Sadabad, M., Reitsema, R. D., de Goffau, M. C., Faber, K. N., Dijkstra, G., & Harmsen, H. J. M.
Affiliations
University Medical Center Groningen (NL)
Corresponding author
Harmsen, Hermie J. M.
Venue
Frontiers in Immunology
Published
2022-05-25
Volume
13
Pages
842911-842911
ISSN
1664-3224 (ISSN-L)
OpenAlex
W4281493632
Cited by
47
References
50
Citations by year
2026: 12 · 2025: 13 · 2024: 11 · 2023: 8 · 2022: 3
FWCI
3.02
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Immunology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (publishedVersion, cc-by)
  • Pure Amsterdam UMC (submittedVersion, cc-by)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion, cc-by)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Inflammatory Bowel Disease
  • Health Sciences › Dentistry › Periodontics › Oral microbiology and periodontitis research
Keywords
inflammatory bowel disease, IgG, intestinal bacteria, gut microbiota, humoral immune response, Streptococcus, Lactobacillus, Lactococcus, Enterococcus, Veillonella, Enterobacteriaceae, Lachnospiraceae, Coprococcus, Dorea, Ruminococcus gnavus, commensal bacteria, immune tolerance, Crohn's disease, ulcerative colitis, fecal microbiota
MeSH terms
Bacteria, Crohn Disease, Humans, Immunoglobulin G, Immunity, RNA, Ribosomal, 16S, Inflammatory Bowel Diseases

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