Intestinal B-cell isotype response in relation to local bacterial load: Evidence for immunoglobulin A subclass adaptation

Intestinal B-cell isotype response in relation to local bacterial load: Evidence for... Background & Aims : In experimental animals, the indigenous microbiota modulates mucosal immunity. In humans, such direct evidence is scarce. The aim of this study was to examine the effect of intestinal bacteria on the local immunoglobulin (Ig) response. Methods : The numbers of IgA-, IgM-, and IgG-producing immunocytes per defined mucosal length unit were determined, and the local IgA subclass response was studied using immunohistochemistry in jejunal segments from adults with bacterial overgrowth and in sterile ileal urinary conduits from children. Results : The ileal bladder mucosa showed atrophy, but the number of immunocytes only tended to be decreased. The jejunal segments with bacterial overgrowth showed minor histological changes; the numbers of IgA and IgG immunocytes were fairly normal, whereas the number of IgM immunocytes was significantly reduced ( P < 0.05) (12 cells/U) compared with control mucosa (24 cells/U). The number of IgA2 immunocytes was significantly decreased ( P < 0.01) in ileal conduits (7 cells/U or 30% of total IgA) but increased ( P < 0.05) in jejunal segments with bacterial overgrowth (42 cells/U or 43% of total IgA) compared with normal ileum (15 cells/U or 40% of total IgA) and jejunum (24 cells/U or 23% of total IgA). Conclusions : An association exists between bacterial load and IgA subclass production. An increase in IgA2 may enhance mucosal protection and probably reflects immunomodulation caused by lipopolysaccharides. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Gastroenterology Elsevier

Intestinal B-cell isotype response in relation to local bacterial load: Evidence for immunoglobulin A subclass adaptation

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Publisher
Elsevier
Copyright
Copyright © 1995 Elsevier Ltd
ISSN
0016-5085
eISSN
1528-0012
D.O.I.
10.1016/0016-5085(95)90389-5
Publisher site
See Article on Publisher Site

Abstract

Background & Aims : In experimental animals, the indigenous microbiota modulates mucosal immunity. In humans, such direct evidence is scarce. The aim of this study was to examine the effect of intestinal bacteria on the local immunoglobulin (Ig) response. Methods : The numbers of IgA-, IgM-, and IgG-producing immunocytes per defined mucosal length unit were determined, and the local IgA subclass response was studied using immunohistochemistry in jejunal segments from adults with bacterial overgrowth and in sterile ileal urinary conduits from children. Results : The ileal bladder mucosa showed atrophy, but the number of immunocytes only tended to be decreased. The jejunal segments with bacterial overgrowth showed minor histological changes; the numbers of IgA and IgG immunocytes were fairly normal, whereas the number of IgM immunocytes was significantly reduced ( P < 0.05) (12 cells/U) compared with control mucosa (24 cells/U). The number of IgA2 immunocytes was significantly decreased ( P < 0.01) in ileal conduits (7 cells/U or 30% of total IgA) but increased ( P < 0.05) in jejunal segments with bacterial overgrowth (42 cells/U or 43% of total IgA) compared with normal ileum (15 cells/U or 40% of total IgA) and jejunum (24 cells/U or 23% of total IgA). Conclusions : An association exists between bacterial load and IgA subclass production. An increase in IgA2 may enhance mucosal protection and probably reflects immunomodulation caused by lipopolysaccharides.

Journal

GastroenterologyElsevier

Published: Sep 1, 1995

References

  • The IgA1 proteases of pathogenic bacteria
    Plaut, AG
  • Effect of hibernation and jejunal bypass on mucosal structure and function
    Carey, HV; Gooke, HJ
  • The origin and antigen-dependent distribution of IgA-containing cells in the intestine
    Husband, AJ; Gowans, JL
  • Clustering of IgA-producing immunocytes related to HLA-DR-positive ducts in normal and inflamed salivary glands
    Thrane, PS; Sollid, LM; Haanes, HR; Brandtzaeg, P
  • Molecular heterogeneity of human IgA antibodies during an immune response
    Russel, MW; Lue, C; van den Wall Bake, AWL; Moldoveanu, Z; Mestecky, J

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