title: Immunomodulatory effects of beta-glucans on porcine alveolar macrophages and bone marrow haematopoietic cell-derived dendritic cells.
abstract: 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.
authors.affiliation: Department of Veterinary Medicine, National Pingtung University of Science & Technology, Pingtung 912, Taiwan, ROC. hcchaung@mail.npust.edu.tw
authors.forename: Hso-Chi
authors.initials: HC
authors.lastname: Chaung
authors.forename: Tzou-Chi
authors.initials: TC
authors.lastname: Huang
authors.forename: Jou-Hui
authors.initials: JH
authors.lastname: Yu
authors.forename: Mei-Li
authors.initials: ML
authors.lastname: Wu
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Chung
mesh_terms: D000818:Animals; D001483:Base Sequence; D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D002454:Cell Differentiation; D003001:Cloning, Molecular; D017931:DNA Primers / Q000235:genetics; D003713:Dendritic Cells / Q000166:cytology / Q000187:drug effects* / Q000276:immunology*; D054884:Host-Pathogen Interactions / Q000276:immunology; D006801:Humans; D007155:Immunologic Factors / Q000737:chemistry / Q000276:immunology / Q000494:pharmacology*; D066298:In Vitro Techniques; D016753:Interleukin-10 / Q000096:biosynthesis; D018664:Interleukin-12 / Q000096:biosynthesis; D037181:Lectins, C-Type; D046911:Macromolecular Substances / Q000737:chemistry / Q000276:immunology / Q000494:pharmacology; D016676:Macrophages, Alveolar / Q000166:cytology / Q000187:drug effects* / Q000276:immunology*; D008297:Male; D008565:Membrane Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D051379:Mice; D046529:Microscopy, Electron, Transmission; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D010587:Phagocytosis; D017434:Protein Structure, Tertiary; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity; D034421:Sus scrofa / Q000235:genetics / Q000276:immunology*; D051195:Toll-Like Receptor 2 / Q000378:metabolism; D051197:Toll-Like Receptor 4 / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis; D047071:beta-Glucans / Q000737:chemistry / Q000276:immunology / Q000494:pharmacology*; D000099181:Dectin-1
chemical_list: D017931:DNA Primers; D007155:Immunologic Factors; D016753:Interleukin-10; D018664:Interleukin-12; D037181:Lectins, C-Type; D046911:Macromolecular Substances; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; D051195:Toll-Like Receptor 2; D051197:Toll-Like Receptor 4; D014409:Tumor Necrosis Factor-alpha; D047071:beta-Glucans; D000099181:Dectin-1