title: Bursin-like peptide (BLP) enhances H9N2 influenza vaccine induced humoral and cell mediated immune responses.
abstract: Vaccination with H9N2 avian influenza whole-inactivated virus (WIV) has been shown to be ineffective at eliciting sufficient humoral and cellular immunity against H9N2 avian influenza virus. This study assessed the effects of a synthetic Bursin-like epitope peptide (BLP) as adjuvant for H9N2 WIV in mice. Titers HI and avian influenza virus neutralizing antibodies, subtypes of HA antibodies, T helper (Th) cytokine levels, cytotoxic T-lymphocyte activities and changes in spleen T-cell subsets and natural killer cells were determined. We found that BLP induced a balance between IgG1 and IgG2a secretion levels. WIV antigen alone induced mainly Th1 cytokines secretion, whereas BLP showed increased secretion of Th1 and Th2 cytokines, including interleukin (IL)-2, interferon-γ (IFN-γ) and IL-4, but not IL-10, and may be resembles a Th0 like response. BLP significantly promoted growth and expansion of natural killer cells and of CD4(+) and CD8(+) T-cell subsets in the spleen. Meanwhile, BLP induced a better cytotoxic T-lymphocyte response to H9N2 virus. Furthermore, virus challenge experiments confirmed that BLP contributed to inhibition replication of the virus from mouse lungs. Taken together, these findings suggest that BLP may be an effective adjuvant for H9N2 avian influenza vaccine.
authors.affiliation: College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471003, PR China; Key Lab of Animal Disease Diagnosis and Immunology of China's, Department of Agriculture, Nanjing Agricultural University, 210095, PR China. Electronic address: wangchen2001@126.com.
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.affiliation: College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471003, PR China.
authors.forename: Xiaokang
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471003, PR China.
authors.forename: Tingcai
authors.initials: T
authors.lastname: Wu
authors.affiliation: Key Lab of Animal Disease Diagnosis and Immunology of China's, Department of Agriculture, Nanjing Agricultural University, 210095, PR China.
authors.forename: Deyuan
authors.initials: D
authors.lastname: Li
authors.affiliation: College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471003, PR China.
authors.forename: Mingfu
authors.initials: M
authors.lastname: Niu
authors.affiliation: College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471003, PR China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471003, PR China.
authors.forename: Chunjie
authors.initials: C
authors.lastname: Zhang
authors.affiliation: College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471003, PR China.
authors.forename: Xiangchao
authors.initials: X
authors.lastname: Cheng
authors.affiliation: Key Lab of Animal Disease Diagnosis and Immunology of China's, Department of Agriculture, Nanjing Agricultural University, 210095, PR China.
authors.forename: Puyan
authors.initials: P
authors.lastname: Chen
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000276:immunology; D016207:Cytokines / Q000276:immunology; D005260:Female; D007113:Immunity, Innate; D053127:Influenza A Virus, H9N2 Subtype / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology*; D007694:Killer Cells, Natural / Q000276:immunology; D008807:Mice, Inbred BALB C; D009842:Oligopeptides / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D016207:Cytokines; D007252:Influenza Vaccines; D009842:Oligopeptides; C016281:bursopoietin
keywords: Adjuvant; Avian influenza virus; Bursin; H9N2; Peptide