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. 1986 Dec;54(3):793–797. doi: 10.1128/iai.54.3.793-797.1986

Mycobacterium leprae-specific Lyt-2+ T lymphocytes with cytolytic activity.

S Chiplunkar, G De Libero, S H Kaufmann
PMCID: PMC260239  PMID: 3096892

Abstract

Mice were immunized intradermally with 10(7) irradiated Mycobacterium leprae organisms, and draining lymph nodes were collected after 4 weeks. Lymph node cells were restimulated in vitro with soluble M. leprae antigen and accessory cells. The resulting T-cell line was propagated in vitro in the presence of M. leprae antigen, accessory cells, and interleukin-2-containing supernatants from concanavalin A-stimulated rat spleen cells. Long-term cultured T cells were Thy-1+ L3T4- Lyt-2+ as revealed by analysis with the fluorescence-activated cell sorter. From this line, T-cell clones with the same phenotype were established. The T-cell clone A4 failed to secret interleukin-2 after stimulation with antigen and accessory cells, and its growth depended on exogeneous interleukin-2. A4 T cells produced gamma interferon in an antigen-specific, H-2-restricted, and interleukin-2-dependent way. Importantly, this T-cell clone was capable of lysing bone marrow macrophages presenting M. leprae antigen. Other T-cell clones as well as native Lyt-2+ T cells from M. leprae-immunized mice were also capable of lysing bone marrow macrophages expressing M. leprae antigens. These findings suggest that specific Lyt-2+ T cells participate in the immune response to M. leprae. It is postulated that cytolysis of M. leprae-infected macrophages or Schwann cells contributes to protection against and pathogenesis of leprosy.

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Selected References

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