Total RNA was extracted with TRIzol (Sangon Ltd., China). RNA concentration was detected by a
Nanodrop spectrophotometer (Thermo Scientific Ltd., USA). Total RNA (500 ng) was used for the synthesis of first-strand cDNA using
HiScript® II Q RT SuperMix for qPCR kit (Vazyme Ltd., China). The following primers were used:
DR4:
forward 5'-ACCTTCAAGTTTGTCGTCGTC-3' and reverse 5'-CCAAAGGGCTATGTTCCCATT-3';
DR5:
forward 5'-ACAGTTGCAGCCGTAGTCTTG -3' and reverse 5'- CCAGGTCGTTGTGAGCTTCT -3';
GAPDH:
forward 5'-TGGAAGGACTCATGACCACA-3' and reverse 5'- TCAGCTCAGGGATGACCTT -3'.
The qRT-PCR reactions were performed using a
CFX96 qRT-PCR system (Applied Biosystems Ltd., USA) according to the manufacturer's instruction. The 2
-ΔΔCT method was used to calculate the fold changes. GAPDH was used as an internal control for the normalization of target gene expression.
You C., Sun Y., Zhang S., Tang G., Zhang N., Li C., Tian X., Ma S., Luo Y., Sun W., Wang F., Liu X., Xiao Y., Gong Y., Zhang J, & Xie C. (2018). Trichosanthin enhances sensitivity of non-small cell lung cancer (NSCLC) TRAIL-resistance cells. International Journal of Biological Sciences, 14(2), 217-227.