The effects of isoniazid and rifampicin on the peripheral mononuclear production of IL-2, IL-12, IL-10, IFN-gamma, and TGF-beta were evaluated in patients with infiltrative pulmonary tuberculosis. Irrespective of the susceptibility of the causative agent to the essential antituberculous drugs, rifampicin was ascertained to initiate increased IL-2 secretion and to reduce the generation of IL-12, IFN-gamma and TGF-beta. Isoniazid suppressed the mononuclear leukocytic production of IFN-gamma in drug-sensitive pulmonary tuberculosis, and conversely, stimulated it in the drug-resistant type. Rifampicin showed a more significant negative effect on mononuclear cytokine-producing activity. In drug-resistant pulmonary tuberculosis, the imbalance of spontaneous, protein- and drug-induced mononuclear secretion of cytokines was established to be more pronounced than in drug-sensitive tuberculosis.
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