Role of miR-27a in regulation of BA-mediated responses. (A) Repression of miR-27a and induction of ZBTB10. RKO cells were treated with DMSO or BA and miR-27a and ZBTB10 expression were determined by Northern blot and semi-quantitative RT-PCR, respectively, as described in the Materials and Methods. (B) BA decreases miR-27a promoter activity. RKO cells were transfected with pMiR-27a(-639/+36)-luc, treated with DMSO or BA and luciferase activity determined as described in the Materials and Methods. Role of BA-induced ROS on expression of miR-27a and ZBTB10 (C) and Myt-1 (D). RKO cells were treated with DMSO, BA, catalase or BA plus catalase for 36 h and miR-27a, ZBTB10 and Myt1 mRNA levels were determined by real time PCR as described in the Materials and Methods. Results in (B) - (D) are expressed as means ± SE for at least 3 replicate determinations and significant (p < 0.05) effects by BA (*) and reversal by catalase (**) are indicated.