Assay (RIPA) buffer (Beijing Solarbio Science and Technology, China). Protein
samples was separated by 10% SDS-PAGE and transferred to polyvinylidene fluoride
membrane (Millipore, Bedford, MA, USA). The membrane was incubated with primary
Abs against RUNX3 (1:1000; Cell Signaling Technology, Danvers, MA, USA), NCR1
(1:500; Abcam, Cambridge, MA, USA) at 4°C overnight, and then incubated with
HRP-conjugated secondary Ab (Abcam, USA) at room temperature for 1 h. Bands were
visualized by an enhanced chemiluminescence reagent (Bio-Rad), and band
intensities were quantified using image software Image Lab (Bio-Rad). β-Actin
(Abcam) was used as an internal control.