title: Polysaccharide purified from Polyporus umbellatus (Per) Fr induces the activation and maturation of murine bone-derived dendritic cells via toll-like receptor 4.
abstract: In this study, we report that a polysaccharide isolated from a Chinese medicinal herb, Zhu Ling (the sclerotium of Polyporus umbellatus (Per) Fr), induces phenotypic and functional maturation of murine bone-derived dendritic cells (BMDCs). Treatment of BMDCs with Polyporus polysaccharide (PPS) resulted in enhanced cell-surface expression of CD86, as well as enhanced production of both interleukin (IL)-12 p40 and IL-10 in a dose-dependent manner. In addition, treatment of BMDCs with PPS resulted in increased T cell-stimulatory capacity and decreased phagocytic ability. PPS-induced production of IL-12 p40 was inhibited by monoclonal antibodies to Toll-like receptor 4 (TLR4). Flow cytometric analysis showed that fluorescence-labeled PPS (f-PPS) bound specifically to BMDCs. This binding was blocked by both unlabeled PPS and anti-TLR4, but not by anti-TLR2 and anti-CR3 monoclonal antibodies. Taken together, our data show that PPS promotes the activation and maturation of murine BMDCs via TLR4.
authors.affiliation: First Affiliated Hospital, Wenzhou Medical College, Wenzhou, Zhejiang 325035, China.
authors.forename: Xinqun
authors.initials: X
authors.lastname: Li
authors.forename: Wen
authors.initials: W
authors.lastname: Xu
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000276:immunology*; D002454:Cell Differentiation / Q000187:drug effects / Q000276:immunology*; D003713:Dendritic Cells / Q000276:immunology*; D004365:Drugs, Chinese Herbal / Q000494:pharmacology; D005260:Female; D016753:Interleukin-10 / Q000276:immunology; D053762:Interleukin-12 Subunit p40 / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D055492:Polyporus / Q000737:chemistry / Q000276:immunology*; D011134:Polysaccharides / Q000302:isolation & purification / Q000494:pharmacology*; D051197:Toll-Like Receptor 4 / Q000276:immunology*
chemical_list: D004365:Drugs, Chinese Herbal; D053762:Interleukin-12 Subunit p40; D011134:Polysaccharides; C493487:Tlr4 protein, mouse; D051197:Toll-Like Receptor 4; D016753:Interleukin-10