dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) sample buffer
[13 ]. Cell lysates were separated
by SDS-PAGE and transferred onto nitrocellulose membranes. The membranes were
blocked with 5% fat-free milk powder in 150 mM NaCl, 50 mM Tris-HCL pH 8.0, 0.1%
Tween-20 (TBST) and incubated overnight at 4°C with the following antibodies: TERT
(Y182), PI3K p110α (04-399), ΔN-p63 (p40 [5 (link)]-[17 ] PC373),
GATA3 (09-076) (Millipore); BMI1 (D20B7), keratin 18 (DC10), cyclin D1 (DCS6), myc
(D84C12), AKT (9272), phospho-AKT-T308 (4056/244 F9), ERBB3 (4754) (Cell Signaling
Technology); FOXA1 (Ab55-178) (Abcam); AGR2 (1C3), tubulin (B-5-1-2) (Sigma);
keratin 14 (LL002, gift from Birgit Lane); ERα (Ab-16, RB-1493)
(ThermoScientific); p53 (D01, gift from David Lane). After three washes in TBST,
bound primary antibodies were detected by incubation with HRP-conjugated
anti-rabbit, anti-mouse or anti-goat IgG (GE Healthcare) at room temperature for
1 hour, washed again in TBST, and visualized using ECL reagents (GE Healthcare).
Images were captured on a Fusion FX7 scanner (Vilber Lourmat) or Hyperfilm (GE
Healthcare).