Publication protocol
SNU484 and HeLa cells were maintained in RPMI and DMEM, respectively, containing 10% fetal bovine serum with 100 unit/ml penicillin/streptomycin at 37 °C in 5% CO2 atmosphere. Transfection were performed with pCS4 vector or pCS4-Myc-Prx1 plasmid using Lipofectamine 2000 according to the manufacturer's protocol (Invitrogen). The cells were synchronized at G0/G1 stage by serum starvation for 72 h and then exposed to 5 μg/ml ActD for indicated times with complete growth medium [2]. Total RNA was extract with TRIzol reagent at the indicated time points following the addition of ActD to block the synthesis of new transcripts. The cDNA was synthesized from 1 μg of total RNA by reverse-transcription PCR with a PrimeScript 1st Strand cDNA Synthesis Kit (Takara). Quantitative real-time PCR using SYBR Premix Ex Taq II was performed to compare the rate of RNA decay in the vector-transfected and Prx1-transfected cells. The human cyclophilin was used as control for mRNA normalization and U6 was used as control for snRNA normalization. The RNA levels were expressed relative to before ActD treatment. Primers used for this analysis are follows: RNU1-7, forward 5′ TGATCACGAAGGTGGTTTTCC 3′ and reverse 5′ GCACATCCGGAGTGCAATC 3’; RNU4-2, forward 5′ GCGCGATTATTGCTAATTGAAAA 3′ and reverse 5′ GCCAATGCCGACTATATTTCAAG 3’; HIST1H4J, forward 5′ ATGTCTGGCCGCGGCAAAGGC 3′ and reverse 5′ GCCGGCTTGGTGATGCCCTGG 3’; ATP5I, forward 5′ ATGGTGCCACCGGTGCAGGT 3′ and reverse 5′ TTAGGTAATTGTAGCGCGTGGC 3’; U6, forward 5′ GCTTCGGCAGCACATATACTAAAAT 3′ and reverse 5′ CGCTTCACGAATTTGCGTGTCAT 3’; Cyclophilin, forward 5′
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