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

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_name

Gastroenterology

journal_title

Gastroenterology

authors

Kett K,Baklien K,Bakken A,Kral JG,Fausa O,Brandtzaeg P

doi

10.1016/0016-5085(95)90389-5

subject

Has Abstract

pub_date

1995-09-01 00:00:00

pages

819-25

issue

3

eissn

0016-5085

issn

1528-0012

pii

0016-5085(95)90389-5

journal_volume

109

pub_type

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