title: Immunological characterization of peripheral blood leukocytes using vaccine for mycoplasmal pneumonia of swine (MPS) in swine line selected for resistance to MPS.
abstract: This study was conducted to evaluate immunological changes in peripheral blood leukocytes in pigs that were genetically selected for their improved resistance to mycoplasmal pneumonia of swine (MPS), using MPS vaccine as an antigen. Twelve castrated MPS-selected Landrace pigs were compared with the same number of pigs from a nonselected line by using a time-course analysis at the hematological level. After the second sensitization with MPS vaccine, the percentages of B cells, CD4(+) T cells, and natural killer (NK) cells in total leukocytes were lower in the selected line than in the nonselected line, whereas the percentage of granulocytes in total leukocytes increased in the MPS-selected line. We also assessed the proliferative ability of peripheral blood mononuclear cells (PBMCs) stimulated with Mycoplasma hyopneumoniae, lipopolysaccharide or concanavalin A, and found that although the proliferative ability of the PBMC was not different between the two lines at a steady state, the nonselected line showed a significantly higher proliferative ability after sensitization with MPS vaccine than the selected line regardless of antigens used. These results thus indicate that the selection of pigs on the basis of MPS resistance changes their immunophenotype, and would give us beneficial information for the prevention of MPS infection.
authors.affiliation: Graduate School of Agricultural Science, Tohoku University, Sendai, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Shimazu
authors.forename: Liushiqi
authors.initials: L
authors.lastname: Borjigin
authors.forename: Yuki
authors.initials: Y
authors.lastname: Katayama
authors.forename: Meihua
authors.initials: M
authors.lastname: Li
authors.forename: Takumi
authors.initials: T
authors.lastname: Satoh
authors.forename: Kouichi
authors.initials: K
authors.lastname: Watanabe
authors.forename: Haruki
authors.initials: H
authors.lastname: Kitazawa
authors.forename: Sang-gun
authors.initials: SG
authors.lastname: Roh
authors.forename: Hisashi
authors.initials: H
authors.lastname: Aso
authors.forename: Kazuo
authors.initials: K
authors.lastname: Katoh
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Suda
authors.forename: Akiko
authors.initials: A
authors.lastname: Sakuma
authors.forename: Mituru
authors.initials: M
authors.lastname: Nakajo
authors.forename: Keiichi
authors.initials: K
authors.lastname: Suzuki
mesh_terms: D000818:Animals; D001428:Bacterial Vaccines / Q000276:immunology*; D060467:Disease Resistance / Q000235:genetics*; D007962:Leukocytes / Q000276:immunology*; D045729:Pneumonia of Swine, Mycoplasmal / Q000276:immunology* / Q000517:prevention & control; D013552:Swine / Q000235:genetics
chemical_list: D001428:Bacterial Vaccines
keywords: Landrace pigs; disease resistance; immunity; mycoplasmal pneumonia