Total RNA in fresh clinical tissue specimens and cells was extracted using the
RNeasy RNA Mini kit (Qiagen, Hilden, Germany) according to the manufacturer's instructions. First-strand cDNA was synthesized using
PowerScript reverse transcriptase (Clontech, San Jose, CA, USA) according to the manufacturer's instructions. Following cDNA synthesis, real-time PCR was performed using a
Fast Start Master SYBR-green kit on a
LightCycler (both from Roche Molecular Systems, indianapolis, iN, USA) according to the manufacturer's instructions. The sequence-specific primer pairs used for quantitative PCR are listed as following: miR-30d forward, 5'-UgU AAA CAU CCC CgA CUg gAA g-3' and reverse, 5'-TgT AAA CAT CCC CgA CTg gAA gA-3'; U6 forward, 5'-CTC gCT TCg gCA gCA CA-3' and reverse, 5'-AAC gCT TCA CgA ATT TgC gT-3'; EZH2 forward, 5'-TTA CTT gTg gAg CCg CTg AC-3' and reverse, 5'-TCA gAT ggT gCC AgC AAT Ag-3'; gAPDH forward, 5'-gCT gAg TAT gTC gTg gAg TC-3' and reverse, 5'-AgT Tgg Tgg TgC Agg ATg C-3'. Relative expression levels of miRNA and mRNA expression in fresh tissues and cells were determined using the 2 -ΔΔCt method. Each sample was examined in triplicate.
Xie R., Wu S.N., Gao C.C., Yang X.Z., Wang H.G., Zhang J.L., Yan W, & Ma T.H. (2017). MicroRNA-30d inhibits the migration and invasion of human esophageal squamous cell carcinoma cells via the post‑transcriptional regulation of enhancer of zeste homolog 2. Oncology reports, 37(3).