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Article Publish Status: FREE
Abstract Title:

Astragalus polysaccharide attenuates rat experimental colitis by inducing regulatory T cells in intestinal Peyer's patches.

Abstract Source:

World J Gastroenterol. 2016 Mar 21 ;22(11):3175-85. PMID: 27003994

Abstract Author(s):

Hai-Mei Zhao, Yan Wang, Xiao-Ying Huang, Min-Fang Huang, Rong Xu, Hai-Yang Yue, Bu-Gao Zhou, Hong-Yan Huang, Qi-Meng Sun, Duan-Yong Liu

Article Affiliation:

Hai-Mei Zhao

Abstract:

AIM: To explore probable mechanism underlying the therapeutic effect of Astragalus polysaccharide (APS) against experimental colitis.

METHODS: Thirty-two Sprague-Dawley rats were randomly divided into four groups. Colitis was induced with 2, 4, 6-trinitrobenzene sulfonic acid (TNBS). The rats with colitis were treated with 400 mg/kg of APS for 7 d. The therapeutic effect was evaluated by colonic weight, weight index of the colon, colonic length, and macroscopic and histological scores. The levels of regulatory T (Treg) cells in Peyer's patches were measured by flow cytometry, and cytokines in colonic tissue homogenates were analyzed using enzyme-linked immunosorbent assay. The expression of related orphan receptor-γt (ROR-γt), IL-23 and STAT-5a was measured by Western blot.

RESULTS: After 7-d treatment with APS, the weight index of the colon, colonic weight, macroscopical and histological scores were decreased, while the colonic length was increased compared with the model group. The expression of interleukin (IL)-2, IL-6, IL-17, IL-23 and ROR-γt in the colonic tissues was down-regulated, but Treg cells in Peyer's patches, TGF-β and STAT5a in the colonic tissues were up-regulated.

CONCLUSION: APS effectively ameliorates TNBS-induced experimental colitis in rats, probably through restoring the number of Treg cells, and inhibiting IL-17 levels in Peyer's patches.

Study Type : Animal Study

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