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The study was conducted to elucidate the effects of orally administered indigestible saccharides (IDS) on immunoresponses of the intestinal tracts, especially secretion and excretion of immunoglobulin A (IgA). Male 4-week-old Sprague-Dawley rats were fed diets containing several kinds of IDS (cellulose, corn husk, glucomannan, curdlan and lactulose) at 5% for three weeks. The results indicated that the proportion of IgA-presenting lymphocytes in the cecal mucosa of the tested IDS groups increased significantly or tended to increase compared with that of the cellulose group. No significant differences among the experimental groups were observed in the CD4(+)- and CD8(+)-presenting lymphocytes and the CD4+/CD8+ ratios in the small intestine, cecum and mesenteric lymph nodes. IgA amounts in the cecal contents increased significantly in the glucomannan and curdlan groups as compared with that in the cellulose group. The inconsistent results were observed in the cecal IgA amounts of the lactulose group. Although IgA excretion into feces increased periodically in the cellulose, hardly any changes were observed in the glucomannan and curdlan groups. These results revealed that IgA secretion from cecal mucosa to contents was promoted, and its excretion to feces was decreased by the oral administration of highly fermentable IDS, respectively, while non- or low-fermentable IDS functioned adversely to IgA responses in the intestinal tract. It is suggested that the response of IgA in the intestinal immune system differs with the type of IDS ingested.

Secretion and Excretion of Immunoglobulin A to Cecum and Feces Differ with Type of Indigestible Sacchrides.