were seeded in 6-well plates (1 × 106 cells per well).
After overnight incubation, the cells were treated with indicated
concentrations for specific timepoints. The harvested cells were spinned
down, washed with PBS, and lysed with 1× LDS loading buffer followed
by sonication and heated at 70 °C. The prepared samples were
loaded on NuPAGE 4–12% Bis–Tris protein gels and transferred
to the nitrocellulose membrane. After blocking the membrane with LI-COR
TBS blocking buffer and incubation in primary antibody overnight,
the corresponding protein signals were detected using IRDye secondary
antibodies and an Odyssey imaging system. Image Studio Lite Ver 5.2
was used for blot quantification. Rabbit anti-human eRF3/GSPT1 pAb
(ab126090, Abcam), mouse anti-human Ikaros mAb (sc-398265, Santa Cruz
Biotechnology), mouse anti-GAPDH mAb (sc-47724, Santa Cruz Biotechnology)
were used as primary antibodies. The IRDye 800CW Goat anti-Mouse IgG
Secondary Antibody and IRDye 680RD Goat anti-Rabbit IgG Secondary
Antibody were used as secondary antibodies.