For qRT-PCR assays, cell and tumor tissue RNA was extracted according the manual of PrimeScript RT reagent Kit (Takara Biotechnology Co., Ltd., China) and Primers were present in Additional file 1: Table S1. The StepOnePlus Real Time PCR System (Applied Biosystems, Foster City, CA, USA) was used. The resulting data were analyzed with the comparative cycle threshold (CT) value for relative gene expression quantification relative to GAPDH.
Cell proteins were extracted using normal method [7 (link)]. After blocking, antibody against HIF-1α (Abcam, UK), Nestin, SOX2, VEGF and GAPDH (Proteintech, China), were added, respectively.
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