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Colonization and distribution of segmented filamentous bacteria (SFB) in chicken gastrointestinal tract and their relationship with host immunity

文献类型： 外文期刊

作者： Liao, Ningbo 1 ; Yin, Yeshi 1 ; Sun, Guochang 1 ; Xiang, Charlie 3 ; Liu, Donghong 2 ; Yu, Hongwei D. 4 ; Wang, Xin 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Plant Protect & Microbiol, State Key Lab Breeding Base Zhejiang Sustainable, Hangzhou 310021, Zhejiang, Peoples R China

2.Zhejiang Univ, Coll Biosyst & Food Sci, Hangzhou 310003, Zhejiang, Peoples R China

3.Zhejiang Univ, Affiliated Hosp 1, State Key Lab Diag & Treatment Infect Dis, Hangzhou 310003, Zhejiang, Peoples R China

4.Marshall Univ, Sch Med, Dept Biochem & Microbiol, Huntington, WV USA

关键词： Chicken;IgA;Immunity;Segmented filamentous bacteria

期刊名称：FEMS MICROBIOLOGY ECOLOGY （ 影响因子：4.194； 五年影响因子：5.137 ）

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收录情况： SCI

摘要： Uncultivable segmented filamentous bacteria (SFB) reside in the gastrointestinal (GI) tract of mammals and can boost the host immunity. Immunoglobulin A (IgA) from mother's milk has been previously shown to be a key factor in regulating SFB colonization. Because neonatal chicken cannot acquire IgA from maternal milk, they are a good model to examine the role of IgA in SFB colonization. Here, we used the fluorescent in situ hybridization (FISH) and quantitative PCR (qPCR) to monitor the colonization and distribution of SFB in chickens aged from 2-day-old to 6-week-old. Early SFB colonization, which primarily occurred in the ileal mucosa (< 13 days old), was IgA independent. From the age of 17-42 days, there was an increase in IgA in the gut mucosa, which was correlated with a decrease in SFB. To examine the effect of probiotics and immunosuppression on SFB colonization, we treated the chickens by feeding them Lactobacillus delbrueckii or giving them a subcutaneous injection of cyclophosphamide (CTX). Feeding lactobacilli at birth rendered SFB colonization occurring 4 days earlier, while CTX treatment increases the SFB colonization through reducing the other non-SFB bacteria. Altogether, our data suggest that early colonization of SFB in chicken occurs independently of IgA and the population of SFB in the GI tract of chicken may be manipulated from birth via probiotic or CTX treatment.

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