title: Induction of specific cytotoxic lymphocytes in mice vaccinated with Brucella abortus RB51.
abstract: A safe, more sensitive, nonradioactive, neutral red uptake assay was adopted to replace the traditional 51Cr release assay for detection of Brucella-specific cytotoxic T lymphocyte (CTL) activity. Our studies indicated that Brucella abortus strain RB51 vaccination of mice induced specific CTLs against both strain RB51- and strain 2308-infected J774.A1 macrophages but not against Listeria monocytogenes-infected J774.A1 cells. The antigen-specific cytotoxic activity was exerted by T lymphocytes but not by NK cells. CD3+ CD4+ T cells secreted the highest level of gamma interferon (IFN-gamma) and were able to exert a low but significant level of specific lysis of Brucella-infected macrophages. They also exerted a low level of nonspecific lysis of noninfected macrophages. In contrast, CD3+ CD8+ T cells secreted low levels of IFN-gamma but demonstrated high levels of specific lysis of Brucella-infected macrophages with no nonspecific lysis. These findings indicate that B. abortus strain RB51 vaccination of mice induces specific CTLs and suggest that CD3+ CD4+ and CD3+ CD8+ T cells play a synergistic role in the anti-Brucella activity.
authors.affiliation: Center for Molecular Medicine and Infectious Diseases, Department of Biomedical Sciences and Pathobiology, VA-MD Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0342, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: He
authors.forename: R
authors.initials: R
authors.lastname: Vemulapalli
authors.forename: A
authors.initials: A
authors.lastname: Zeytun
authors.forename: G G
authors.initials: GG
authors.lastname: Schurig
mesh_terms: D000818:Animals; D002004:Brucella Vaccine / Q000276:immunology*; D002003:Brucella abortus / Q000276:immunology*; D002006:Brucellosis / Q000276:immunology / Q000517:prevention & control*; D017252:CD3 Complex / Q000378:metabolism; D005260:Female; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014611:Vaccination
chemical_list: D002004:Brucella Vaccine; D017252:CD3 Complex