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Mycobacterium tuberculosis strains associated with IS6110 restriction fragment-length polymorphism (RFLP) pattern clusters and strains demonstrating unique IS6110 RFLP patterns were investigated in interferon- gamma -activated THP-1 cells by measurement of binding, intracellular growth rate, and cytokine production. Binding was the same for all strains; however, strains from clusters grew significantly more rapidly than did unique strains. Maximal concentration of tumor necrosis factor (TNF)-alpha was detected at 2 days after infection, with unique strains eliciting significantly greater amounts than did strains from clusters. Interleukin (IL)-10 levels peaked at 1 day after infection with strains from clusters, whereas they peaked at 5 days after infection with unique strains. Rapid growth demonstrated by strains from clusters was highly correlated with rapid production of IL-10 and suppression of TNF-alpha in THP-1 cells during the early stages of infection. Characterization of this phenotype will further advance the investigation of virulence factors in M. tuberculosis.

Intracellular Macrophage Growth Rates and Cytokine Profiles ofMycobacterium tuberculosisStrains with Different Transmission Dynamics