Knockdown of TIRAP expression induced apoptosis of non-small cell lung cancer cells. (A) Cell apoptosis analysis of H1975, H1650, and LTEP-a2 cells after transfection with Neg. and TIRAP siRNA. All cells were exposed to Neg. and TIRAP siRNA for 12 h, followed by culturing with complete RPMI-1640 media for 36 h before cell apoptosis analysis. The proportion of early and late apoptotic cells are shown in the histogram. (B) Western blot analysis of the expressions of Bcl-2 and Bax in H1975, H1650, and LTEP-a2 cells after transfected with Neg. and TIRAP siRNA. All cells were exposed to Neg. and TIRAP siRNA for 12 h, followed by culturing with complete medium for 48 h before protein extraction and Western analysis. TIRAP, Toll/interleukin 1 receptor domain-containing adaptor protein. Neg. siRNA, negative control siRNA. Bars represent mean ± SD. *, p < 0.05; **, p < 0.01.