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. 1988 Feb;56(2):395–399. doi: 10.1128/iai.56.2.395-399.1988

Effect of dietary restriction on total and bacterium-specific mucosal secretory immunoglobulin A in bile-diverted intestinal self-filling blind loops.

S N Lichtman 1, P M Sherman 1, G G Forstner 1
PMCID: PMC259294  PMID: 3338846

Abstract

The effect of starvation on the mucosal secretory immunoglobulin A (sIgA) response to bacterial antigens was studied in bile-free rat self-filling blind loops constructed at the end of a Roux-en-Y branch of jejunum. Rats were fed a 50% restricted diet for 1 to 4 weeks after surgery. sIgA was measured in the mucosa and lumen by an enzyme-linked immunosorbent assay. Dietary restriction caused a final rise of luminal sIgA which was less than 50% of that of normally fed controls Luminal bacteria counts were not different in the two groups. The percentage of total sIgA precipitated with intestinal bacteria was not significantly affected by dietary restriction, and there was no change in the specific binding of sIgA to several bacterial species. Nonprecipitated sIgA exhibited a low but significant specific binding to bacteria in both diet-restricted and fed rats. Diet restriction therefore reduced the total sIgA response to luminal bacteria, but the specific bacterial binding capacity per microgram of sIgA was not altered. In these short-term experiments diet-restricted animals appeared to be capable of secreting sIgA in excess of requirement, since the nonprecipitable luminal fraction contained free sIgA with binding capacity for bacteria. The ability of sIgA to react with specific antigens may therefore be of more significance as an indicator of bacterial susceptibility than the measurement of total sIgA.

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Selected References

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