title: Evaluation of Mycobacterium leprae immunogenicity via adoptive transfer studies.
abstract: The immune response of mice to live, heat-killed, or autoclaved Mycobacterium leprae was investigated. After sensitization with 10(7) organisms in each group, recipient mice were transfused with the sensitized splenocytes 28 days later. A selected number of these mice were infected with 5 X 10(3) M. leprae, and the remaining animals were sacrificed at scheduled intervals for evidence of cell-mediated immunity to the M. leprae cell extract. Data from these and the bacteriological assays showed that all three materials induce cell-mediated immunity and also extend protection against the M. leprae challenge but not against a Listeria monocytogenes challenge. Adoptive immunity against M. leprae was expressed equally effectively in both non-irradiated animals and those sublethally (500 R) irradiated. This study reveals that, after adoptive transfer of immunity, a bacillary restriction occurs with concomitant onset of delayed hypersensitivity and that the protection observed could be specifically directed against an M. leprae challenge.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D005260:Female; D006358:Hot Temperature; D007111:Immunity, Cellular; D007116:Immunization, Passive; D007918:Leprosy / Q000276:immunology*; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D009166:Mycobacterium leprae / Q000276:immunology*; D012882:Skin Tests