Total RNAs from HL-60 and KG1a cells were extracted using TRIZOL (Invitrogen, USA). The first-strand cDNA was made by PrimeScript II 1st Strand cDNA Synthesis Kit (TaKaRa Biotechnology, Dalian, Liaoning, China) according to the manufacturer’s instructions. The amount of target RNA was normalized to the amount of internal control (GAPDH) and the results were given by 2−△△Ct relative to the control sample. The qRT-PCR was performed by SYBR Green (Takara Biotechnology, China). The primer sequence was as follows: GPX4 forward: 5′-TCAGCAAGATCTGCGTGAAC-3′, reverse: 5′-GGGGCAGGTCCTTCTCTATC-3′; EP300 forward: 5′-CCTGAGTAGGGGCAACAAGAAGA-3′, reverse: 5′-ATGAGGCGGATCACAAAGAAGAC-3′; GAPDH forward: 5′-AACGGATTTGGTCGTATTGGG-3′, reverse: 5′-CCTGGAAGATGGTGATGGGAT-3′.
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