title: Effects of Mycoplasma hyopneumoniae on porcine nasal cavity dendritic cells.
abstract: Mycoplasma hyopneumoniae (Mhp) is the primary etiological agent responsible for swine enzootic pneumonia (EP), a disease that cause tremendous economic losses all over the swine industry. Dendritic cells (DCs), the most effective antigen-presenting cells, are widely distributed beneath respiratory epithelium. DCs uptake and present antigens to T cells, to initiate protective immune responses or generate immune-mediated pathology in different infections. In this study, we investigated the changes in the different DCs subpopulations, T cells and SIgA positive cells counts in porcine nasal cavity after long time Mhp infection. We further evaluated the role of porcine DCs in Mhp exposure. Our results showed that the number of SLA-II-DR+SWC3a+DCs, SLA-II-DR+CD11b+DCs, T cells, SIgA positive cells in nasal cavity were decreased after Mhp 28 days infection in vivo experiment. The antigen presenting ability of DCs were inhibited by Mhp exposure. DCs couldn't activate T-cell proliferation by down-regulating the antigen presenting molecule CD1a expression and promoting high level of IL-10 production. Further more, the expression levels of IL-12 and IFN-γ in DCs were decreased, suggesting that DCs favour for Th2 immune response development after Mhp exposure in vitro. Taken together, Mhp infection impairs the immune function which allows the persistence of Mhp and cause predispose pigs to secondary infections. The decline of DCs presentation ability is the reason why dysfunction and persistence in Mhp infection. These findings are benefit for exploring the pathogenic mechanisms of Mhp in pigs.
authors.affiliation: Veterinary College, Nanjing Agricultural University, Weigang 1, Nanjing, Jiangsu 210095, PR China.
authors.forename: Yumeng
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Veterinary College, Nanjing Agricultural University, Weigang 1, Nanjing, Jiangsu 210095, PR China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Hu
authors.affiliation: Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-Products, Nanjing 210014, PR China.
authors.forename: Yanna
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-Products, Nanjing 210014, PR China.
authors.forename: Zhixin
authors.initials: Z
authors.lastname: Feng
authors.affiliation: Veterinary College, Nanjing Agricultural University, Weigang 1, Nanjing, Jiangsu 210095, PR China. Electronic address: zxbyq@njau.edu.cn.
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
mesh_terms: D000818:Animals; D002452:Cell Count; D049109:Cell Proliferation; D002478:Cells, Cultured; D016207:Cytokines / Q000235:genetics; D003713:Dendritic Cells / Q000276:immunology* / Q000382:microbiology* / Q000473:pathology; D005786:Gene Expression Regulation / Q000276:immunology; D054884:Host-Pathogen Interactions / Q000276:immunology*; D007071:Immunoglobulin A, Secretory / Q000378:metabolism; D008264:Macrophages / Q000166:cytology; D045705:Mycoplasma hyopneumoniae / Q000276:immunology*; D009296:Nasal Cavity / Q000276:immunology / Q000382:microbiology / Q000473:pathology; D045729:Pneumonia of Swine, Mycoplasmal / Q000276:immunology* / Q000473:pathology; D013047:Specific Pathogen-Free Organisms; D013552:Swine; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology
chemical_list: D016207:Cytokines; D007071:Immunoglobulin A, Secretory
keywords: Dendritic cells; Mycoplasma hyopneumoniae; Nasal cavity