RNA extraction, RT and quantitative PCR were performed as described previously [53 (link)]. Primer pairs (5´-3´) were synthesized by Sangon Biotech Co., Ltd. (Shanghai, China) as follows: Pim-1 (NM_017034.1) forward, ctgctcaaggacacagtctaca; Pim-1 reverse, agggacaggcaccatctaataa; PCNA (NM_022381.1) forward, gggtgaagttttctgcgagt; PCNA reverse, cagtggagtggcttttgtga; β-actin (NM_031144) forward, cccatctatgagggttacgc, β-actin reverse, tttaatgtcacgcacgatttc. PCR was conducted using a LightCycler480 II instrument (Roche Ltd., Guangzhou, China). Relative abundances of target mRNAs were determined from the CT values and plotted as the fold-change compared with the control groups.
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