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The Salivary IgA Flow Rate Is Increased by High Concentrations of Short-Chain Fatty Acids in the Cecum of Rats Ingesting Fructooligosaccharides

1
School of Dental Hygiene, Department of Junior College, Kanagawa Dental University, Yokosuka, Kanagawa 238-8580, Japan
2
Department of Nutrition and Health Sciences, Fukuoka Women’s University, Fukuoka 813-8529, Japan
3
Division of Environmental Pathology, Department of Oral Science, Kanagawa Dental University, Graduate School of Dentistry, Yokosuka, Kanagawa 238-8580, Japan
4
Department of Highly Advanced Stomatology, Kanagawa Dental University, Graduate School of Dentistry, Yokohama, Kanagawa 221-0835, Japan
*
Author to whom correspondence should be addressed.
Nutrients 2016, 8(8), 500; https://doi.org/10.3390/nu8080500
Received: 9 June 2016 / Revised: 21 July 2016 / Accepted: 11 August 2016 / Published: 17 August 2016
Salivary immunoglobulin A (IgA) serves as a major effector in mucosal immunity by preventing submucosal invasion of pathogens. However, the mechanism by which consumption of fermentable fibers increases IgA in saliva was not fully elucidated. This study investigated the effects of fructooligosaccharides (FOS) intake and time after feeding on IgA levels in the saliva and cecal digesta and on the concentration of short-chain fatty acids (SCFA) in the cecum in rats. Five-week-old rats were fed a fiber-free diet or a diet with 50 g/kg FOS for zero, one, four, and eight weeks. Ingestion of FOS at one and eight weeks led to a higher IgA flow rate of saliva per weight of submandibular gland tissue (p < 0.05), which positively correlated with the concentration of SCFA in the cecal digesta (rs = 0.86, p = 0.0006, n = 12), but showed no correlation with the concentration of IgA in the cecal digesta (rs = 0.15, p = 0.3, n = 48). These results suggested that ingestion of FOS increased salivary IgA secretion through high levels of SCFA in the large intestine, which was produced by fermentation of FOS. Thus, continuously ingesting FOS for more than one week could increase secretion of salivary IgA. View Full-Text
Keywords: IgA; saliva; short-chain fatty acid; fructooligosaccharides; rats IgA; saliva; short-chain fatty acid; fructooligosaccharides; rats
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Yamamoto, Y.; Takahahi, T.; To, M.; Nakagawa, Y.; Hayashi, T.; Shimizu, T.; Kamata, Y.; Saruta, J.; Tsukinoki, K. The Salivary IgA Flow Rate Is Increased by High Concentrations of Short-Chain Fatty Acids in the Cecum of Rats Ingesting Fructooligosaccharides. Nutrients 2016, 8, 500.

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