期刊
CARBOHYDRATE POLYMERS
卷 161, 期 -, 页码 149-157出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.12.034
关键词
Acemannan; Cytokine; Immunomodulator; Toll-like receptor; NE-kappa B; Simulation model; Flagellin binding site
资金
- 90th Anniversary of Chulalongkorn University Fund (Ratchadaphiseksomphot Endowment Fund)
- Thai Government Research Fund
- National Research University Project, Office of Higher Education Commission, Thailand [WCU-053-AS-57]
- Ratchadaphiseksomphot Endowment Fund Part of the Strengthen CU's Researcher's Project
Acemannan, an acetylated polymannose from Aloe vera, has immunomodulatory effects. We investigated whether acemannan induces IL-6 and-8 expression and NF-kappa B/DNA binding in human gingival fibroblasts. IL-6 and-8 expression levels were assessed via RT-PCR and ELISA. The NF-kappa B p50/p65-DNA binding was determined. The structures of acemannan mono-pentamers and Toll-like receptor 5 (TLR5) were simulated. The binding energies between acemannan and TLR5 were identified. We found that acemannan significantly stimulated IL-6/-8 expression at both the mRNA and protein level and significantly increased p50/DNA binding. Preincubation with an anti-TLR5 neutralizing antibody abolished acemannan-induced IL-6/-8 expression and p50/DNA binding, and co-incubation of acemannan with Bay11-7082, a specific NF-kappa B inhibitor, abolished IL-6/-8 expression. The computer modeling indicated that monomeric/dimeric single stranded acemannan molecules interacted with the TLR5 flagellin recognition sites with a high binding affinity. We conclude that acemannan induces IL-6/-8 expression, and p50/DNA binding in gingival fibroblasts, at least partly, via a TLR5/NF-kappa B-dependent signaling pathway. Furthermore, acemannan selectively binds with TLR5 ecto domain flagellin recognition sites.(C) 2017 Elsevier Ltd. All rights reserved.
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