Mouse IgA Modulates Human Gut Microbiota with Inflammatory Bowel Disease Patients

Overview

Journal J Gastroenterol

Specialty Gastroenterology

Date 2024 Jun 14

PMID 38874761

Authors

Keishu Takahashi

Naoki Morita

Ryutaro Tamano

Peng Gao

Noriho Iida

Akira Andoh

Hirotsugu Imaeda

Ken Kurokawa

Mayo Tsuboi

Yoku Hayakawa

Mitsuhiro Fujishiro

Reiko Shinkura

Affiliations

Soon will be listed here.

Abstract

Background: The imbalance of commensal bacteria is called dysbiosis in intestinal microflora. Secreted IgA in the intestinal lumen plays an important role in the regulation of microbiota. Although dysbiosis of gut bacteria is reported in IBD patients, it remains unclear what makes dysbiosis of their microflora. The intervention method for remedy of dysbiosis in IBD patients is not well established. In this study, we focused on the quality of human endogenous IgA and investigated whether mouse monoclonal IgA which binds to selectively colitogenic bacteria can modulate human gut microbiota with IBD patients.

Methods: IgA-bound and -unbound bacteria were sorted by MACS and cell sorter. Sorted bacteria were analyzed by 16S rRNA sequencing to investigate what kinds of bacteria endogenous IgA or mouse IgA recognized in human gut microbiota. To evaluate the effect of mouse IgA, gnotobiotic mice with IBD patient microbiota were orally administrated with mouse IgA and analyzed gut microbiota.

Results: We show that human endogenous IgA has abnormal binding activity to gut bacteria in IBD patients. Mouse IgA can bind to human microbiota and bind to selectively colitogenic bacteria. The rW27, especially, has a growth inhibitory activity to human colitogenic bacteria. Furthermore, oral administration of mouse IgA reduced an inflammation biomarker, fecal lipocalin 2, in mice colonized with IBD patient-derived microbiota, and improved dysbiosis of IBD patient sample.

Conclusion: Oral treatment of mouse IgA can treat gut dysbiosis in IBD patients by modulating gut microbiota.

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