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. 1988 Mar;71(3):399–404.

Evidence of cell-mediated immune contrasuppression in lepromatous leprosy: modulation of a putative T contrasuppressor cell-subset.

R González-Amaro 1, J F Salazar-González 1, L Baranda 1, C Abud-Mendoza 1, B Moncada 1, R García 1, J Alcocer-Varela 1
PMCID: PMC1541667  PMID: 3133142

Abstract

Some lepromatous leprosy (LL) patients are characterized by the presence of activated suppressor T cells that specifically inhibit the immune response to Mycobacterium leprae antigens. Immune contrasuppressor (CS) cell activity antagonize suppressor function. Whereas the former function has been extensively studied in leprosy, the latter has not been explored. We studied the peripheral blood mononuclear cells (PBMNC) of 20 patients with leprosy (10 lepromatous and 10 tuberculoid) and six healthy contacts. We found CS-like activity in the PBMNC from some LL patients when assayed in vitro using lepromin as antigen. This CS-like function was found in CD8+, vicia villosa adherent (VV+) T cells. CS-like activity was not detected in PBMNC from either tuberculoid patients or healthy contacts. Pre-treatment of CD8+, VV+ cells with either recombinant IL-2 (5 u/ml) or recombinant interferon-gamma (1,000 u/ml) did not modify significantly their putative CS function. However, in 50% of lepromatous patients the pre-incubation of CD8+, VV+ cells with both lymphokines together increased significantly the CS-like activity. These data suggest that the in vitro immune response to M. leprae in some LL patients can be augmented by either modifying numerically the contrasuppressor T cells or activating them with lymphokines.

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Selected References

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