Journal
VETERINARY IMMUNOLOGY AND IMMUNOPATHOLOGY
Volume 131, Issue 3-4, Pages 147-157Publisher
ELSEVIER
DOI: 10.1016/j.vetimm.2009.04.004
Keywords
beta-Glucan; Dectin-1; Toll-like receptors; Macrophages; Dendritic cells; Pig
Categories
Funding
- National Council Science in Taiwan [NSC95-2321-B-020-003, NSC96-2321-B-020-003]
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The immunopharmacological activities of beta-glucans with a backbone of beta-1,3/beta-1,6-linkages associated with anti-tumor, anti-viral, bacterial and fungal infections have been well documented. Dectin-1, a specific pattern recognition receptor for beta-1,3/beta-1,6-glucans, is expressed mainly on phagocytes, especially macrophages and dendritic cells (DCs). In this study, the encoding nucleotide for the carbohydrate-recognition domain (CRD) of porcine dectin-1 was sequenced for the first time, and the immunomodulatory functions of a synthetic particulate beta-glucan (p-beta-glucan) were examined. Results showed that p-beta-glucan significantly enhanced cell activity and phagocytosis in porcine alveolar macrophages (AMs), immature DCs (imDCs) and mature DCs (mDCs), in a similar way to zymosan. Zymosan enhanced dectin-1/TLR2/TLR4 expression and TNF-alpha/IL-10 production in all of three types of cell, whereas p-beta-glucan increased dectin-1/TLR4 and TNF-alpha/IL-12 production in AMs but inhibited IL-10 in mDCs. These results indicate that the complex collaborating interactions between dectin-1 and TLRs in the recognition of beta-1,3/beta-1,6-glucans with different structural features may direct different cellular responses. (C) 2009 Elsevier B.V. All rights reserved.
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