Figure 3.

miR-142-5p expression levels BC cell lines. (A) Reverse transcription-quantitative polymerase chain reaction results indicated that MDA-MB-231 BC cells expressed the highest levels of miR-142-5p. **P<0.01 vs. MCF-10A or SK-BR-3 cells. (B and C) MDA-MB-231 cells were used in subsequent experiments, which demonstrated that (B) miR-142-5p expression was reduced in cells transfected with the miR-142-5p inhibitor, and (C) PTEN expression levels were increased in cells transfected with the miR-142-5p inhibitor. **P<0.01 vs. control or NC group. miR, microRNA; PTEN, phosphatase and tensin homolog; NC, negative control.