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To address this we have developed a cytotoxicity assay in which <jats:sup>51<\/jats:sup>Cr\u2010labeled monocytes pulsed with bacillus Calmette Gu\u00e9rin (BCG) or <jats:italic>Myco\u2010bacterium leprae<\/jats:italic>, were used as target cells in overnight cytotoxicity assays. As effector cells, peripheral blood mononuclear cells from healthy occupational contacts or from leprosy patients stimulated with antigen for 7 days were used. Cytotoxicity against antigen\u2010pulsed monocytes that could be induced by mycobacterial antigens was proportional to the degree of antigen responsiveness in each individual, as measured in lymphocyte transformation tests. The lepromatous leprosy patients tested were often poor responders to BCG as well as <jats:italic>M. leprae<\/jats:italic>, both with regard to induction of cytotoxicity as well as in lympho\u2010proliferation. Killing was significantly higher against antigen\u2010pulsed vs. non\u2010pulsed monocytes, although significant killing was induced against the latter as well and paralleled by induction of natural killer activity against the K\u2010562 target cell. Cross\u2010reactivity was observed between BCG and <jats:italic>M. leprae<\/jats:italic>, but not with unrelated antigen (tetanus toxoid) or with endogenous stress proteins induced by heat shock. <jats:italic>M. leprae\u2010<\/jats:italic> and BCG\u2010activated cytotoxic cells were found in both the CD4<jats:sup>\u2212<\/jats:sup>CD8<jats:sup>+<\/jats:sup> and CD4<jats:sup>+<\/jats:sup>CD8<jats:sup>\u2212<\/jats:sup> populations, whereas in contrast the soluble antigen, purified protein derivative of <jats:italic>M. tuberculosis<\/jats:italic>, generated cytotoxic cells that were exclusively of the CD4<jats:sup>+<\/jats:sup> phenotype. The involvement of both specific T cells as well as nonspecific cells in the killing of human macrophages may be important with respect to protection and immunopathology induced by mycobacterial antigens.<\/jats:p>","DOI":"10.1002\/eji.1830201219","type":"journal-article","created":{"date-parts":[[2007,3,1]],"date-time":"2007-03-01T11:54:29Z","timestamp":1172750069000},"page":"2651-2659","source":"Crossref","is-referenced-by-count":74,"title":["Mycobacterial\u2010induced cytotoxic T cells as well as nonspecific killer cells derived from healthy individuals and leprosy patients"],"prefix":"10.1002","volume":"20","author":[{"given":"Birhane","family":"Kaleab","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tom","family":"Ottenoff","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paul","family":"Converse","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eva","family":"Halapi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Genet","family":"Tadesse","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martin","family":"Rottenberg","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rolf","family":"Kiessling","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,12,14]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1093\/clinids\/5.4.765"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1093\/clinids\/3.6.1221"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1084\/jem.158.3.670"},{"key":"e_1_2_1_5_2","doi-asserted-by":"crossref","first-page":"2032","DOI":"10.4049\/jimmunol.139.6.2032","volume":"139","author":"Pedrazzini T.","year":"1987","journal-title":"J. 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