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Toll-like receptor activation in basophils contributes to the development of IgG4-related disease

  • Original Article—Liver, Pancreas, and Biliary Tract
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Abstract

Background

IgG4-related disease (IRD) is characterized by systemic IgG4 antibody responses and by infiltration of IgG4-expressing plasma cells into the affected organs. Although T helper type 2 (Th2) cytokines are implicated in enhanced IgG4 responses, molecular mechanisms accounting for the development of IgG4 antibody responses are poorly defined. Since basophils function as antigen-presenting cells for Th2 responses, we tried to clarify the role of basophils in the development of IgG4 responses in this study.

Methods

IgG4 and cytokine responses to various nucleotide-binding oligomerization domain-like receptor and Toll-like receptor (TLR) ligands were examined by using basophils isolated from healthy controls and from patients with IgG4-related disease.

Results

Activation of TLRs in basophils from healthy controls induced IgG4 production by B cells, which effect was associated with enhanced production of B cell activating factor (BAFF) and IL-13. In addition, activation of TLRs in basophils from patients with IRD induced a large amount of IgG4 by B cells from healthy controls. This enhancement of IgG4 production was again associated with BAFF and IL-13.

Conclusions

These data suggest that innate immune responses mediated through TLRs may play a role in the development of IgG4-related disease, in part by production of BAFF from basophils.

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Abbreviations

Ab:

Antibody

Ag:

Antigen

AIP:

Autoimmune pancreatitis

APC:

Antigen-presenting cell

BAFF:

B cell activating factor

ELISA:

Enzyme-linked immunosorbent assay

IRD:

IgG4-related disease

LPS:

Lipopolysaccharide

MDP:

Muramyl dipeptide

NOD2:

Nucleotide-binding oligomerization domain 2

NLR:

NOD-like receptor

PAM:

Pam3CSK4

PBMC:

Peripheral blood mononuclear cell

PGN:

Peptidoglycan

TLR:

Toll-like receptor

TSLP:

Thymic stromal lymphopoietin

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Acknowledgments

This work is supported in part by grants from the Ministry of Education, Science and Culture, Japan, and the Japan Society for the Promotion of Science (21590532); Takeda Science Foundation; Astellas Foundation for Research on Metabolic Disorders; Yakult Bioscience Foundation; Cell Science Research Foundation; Kato Memorial Trust for Nambyo Research; Pancreas Research Foundation of Japan; Uehara Memorial Foundation (to T. W.); and Health and Labour Sciences Research Grants for research on intractable diseases from the Ministry of Health, Labour and Welfare of Japan (to T. C.).

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The authors have declared no conflicts of interest.

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Correspondence to Tomohiro Watanabe.

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Watanabe, T., Yamashita, K., Sakurai, T. et al. Toll-like receptor activation in basophils contributes to the development of IgG4-related disease. J Gastroenterol 48, 247–253 (2013). https://doi.org/10.1007/s00535-012-0626-8

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  • DOI: https://doi.org/10.1007/s00535-012-0626-8

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