Changes in DNMT1, DNMT3a, and DNMT3b protein expression and enzyme activity in various drug groups with AZA. The cells were incubated with each of the anti-tuberculosis drugs (isoniazid, INH; pyrazinamide, PZA; INH + rifampicin, RIF; or INH + RIF + PZA) or their combination with AZA (10 μM) for 12 h. Protein concentration and enzyme activity were detected by ELISA. Each group included 6 parallel samples, each of which was measured three times.