Abstract
The bursa of Fabricius of the chicken is known to be both a primary lymphoid organ and a secondary lymphoid tissue. Bursal follicles are equipped with antigen-trapping follicle-associated epithelium. However, bioactive antigens such as protein and bacteria have not been detected in the bursal parenchyma. By immunoperoxidase staining with a polyspecific antibody (Ab) against Escherichia coli, we detected aggregated E. coli antigens in the medulla of bursal follicles after hatching. The distribution of aggregated E. coli antigens is restricted to the medulla of bursal follicles. The antigens are not found in the spleen or the parenchyma of the caecal tonsil. The bursa is thus a trapping site for E. coli antigens from the external environment. Furthermore, two-color immunostaining clarified that these antigens form immune complexes with maternal IgG (MIgG) and are retained by reticular cells. Additionally, immune complexes in the bursa were shown to induce the rapid development of serum IgM Ab for indigenous E. coli. Our results suggest that immune complexes of MIgG and environmental antigens in the medulla of bursal follicles exert positive effects on B-cell differentiation in the bursa in situ.
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Abbreviations
- Ab:
-
Antibody
- BDL:
-
Bursal duct ligation
- CLSM:
-
Confocal laser scanning microscopy
- ELISA:
-
Enzyme-linked immunosorbent assay
- FAE:
-
Follicle-associated epithelium
- FDC:
-
Follicular dendritic cell
- MIgG:
-
Maternal IgG
- TPBS:
-
Phosphate-buffered saline with 0.05 % Tween 20
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Acknowledgment
We thank Dr. S. Kawamura and Ms. M. Susa for their helpful discussions.
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This work was supported in part by the Mishima Kaiun Memorial Foundation and Nisshin Seifun Group in Japan.
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Sonoda, K., Noguchi, K. & Ekino, S. Immune complexes of E. coli antigens and maternal IgG in the bursa of Fabricius. Cell Tissue Res 354, 813–821 (2013). https://doi.org/10.1007/s00441-013-1701-z
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DOI: https://doi.org/10.1007/s00441-013-1701-z