Trizol (Invitrogen, Carlsbad, USA) was used to lyse NPCs according to manufacturer's protocol. RevertAid RT Reverse Transcription Kit (TaKaRa Bio, Otsu, Japan) was used to reverse transcribed the total RNA into cDNA as instructed. SYBR Green Master Mix Reagent (Toneker, Shanghai, China) was used for quantitative PCR for determination of mRNA levels (IL-6 and STAT3) according to the protocol. An internal reference gene (GAPDH) was amplified simultaneously with the target genes. Primer sequences were as follows: IL-6-F: 5'-GAGGATACCACTCCCAACAGACC-3', IL-6-R: 5'-AAGTGCATCATCGTTGTTCATACA-3'; STAT3-F: 5'-GAGTCAGGCACTGTGGG-3', STAT3-R: 5'-CGGTCGGTTTCTGCCTGTA-3'; GAPDH-F: 5'-TTCAACGGCACAGTCAAG-3', GAPDH-R: 5'-TGGTTCACACCCATCACA-3'. The experiment was independently repeated three times.
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