HSF1 and tuberculosis: Since HSF1, NRF2 and p62/SQSTM1 proteins may be activated in the course of oxidative stress, we evaluated the level of intracellular ROS in PEL cells treated with TB or BZ in the presence or absence of HSF1 or NRF2 inhibitors KRIBB11 (I-HSF1) and brusatol (I-NRF2) respectively.