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N Fazal, D A Lammas, M Rahelu, A D Pithie, J S H Gaston, D S Kumararatne, Lysis of human macrophages by cytolytic CD4+ T cells fails to affect survival of intracellular Mycobacterium bovis-bacille Calmette-Guérin (BCG), Clinical and Experimental Immunology, Volume 99, Issue 1, January 1995, Pages 82–89, https://doi.org/10.1111/j.1365-2249.1995.tb03476.x
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SUMMARY
Human CD4+, mycobacteria-specific, cytolytic T cell clones were used to lyse BCG-infected macrophages. and the effect on the subsequent growth and viability of the organisms was examined. The survival of released bacteria following cell lysis was assessed by both 3H-uridine labelling and colony-forming unit (CFU) estimation. The results indicate that even when effective antigen-specific or lectin-mediated cytolysis of the infected macrophages was achieved, there was no evidence for a direct mycobactericidal effect on the intracellular bacteria. This remained the case even if the period of co-culture of T cells and macrophages was extended up to 48 h. Pretreatment of the macrophages with interferon-gamma (IFN-γ) was not able to act together with T cell-mediated lysis to produce inhibition of mycobacterial growth.