title: In vivo depletion of CD4 and CD8 T lymphocytes impairs Mycobacterium w vaccine-induced protection against M. tuberculosis in mice.
abstract: In the present study we sought to determine the relative role of CD4 and CD8 T cells in Mycobacterium w-induced protective immunity against tuberculosis of mice by in vivo depletion with specific monoclonal antibodies (mAb). Mice were immunized first with M.w, 4 weeks later treated with anti-CD4, anti-CD8 or a combination of both mAb and subsequently infected with M. tuberculosis H37Rv i.v. Numbers of colony-forming units in animals depleted of CD4 T cells, CD8 T cells or both T cell populations were significantly higher than those in control mice receiving irrelevant mAb or no mAb. Cytokine production by T cell subsets was also determined by culturing the cells remaining after in vivo depletion in the presence or absence of mycobacterial antigens. CD8 (CD4 depleted) T cells produced lower levels of interferon-gamma than CD4 (CD8 depleted) T cells. These data suggest that both CD4 and CD8 T cells participate in resistance against tuberculosis induced by vaccination with M.w.
authors.affiliation: Department of Microbiology, National Institute of Immunology, New Delhi, India.
authors.forename: I
authors.initials: I
authors.lastname: Guleria
authors.forename: R
authors.initials: R
authors.lastname: Mukherjee
authors.forename: S H
authors.initials: SH
authors.lastname: Kaufmann
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis; D007109:Immunity; D051379:Mice; D008810:Mice, Inbred C57BL; D009169:Mycobacterium tuberculosis / Q000276:immunology*; D009170:Nontuberculous Mycobacteria / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D014376:Tuberculosis / Q000276:immunology* / Q000517:prevention & control; D015164:Vaccines, Inactivated / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D016207:Cytokines; D015164:Vaccines, Inactivated