Publication protocol
Protein samples were mixed with NuPAGE LDS Sample Buffer 4 × (Life Technologies) and heated at 80 °C for 10 min. Equal amount of proteins were loaded and separated in a NuPage 4–12% Bis Tris gel (Life Technologies) at non-reducing (in the case of Sulfo-N-hydroxysuccinimide-SS-Biotin-conjugated proteins) or reducing conditions, then transferred onto a polyvinylidene fluoride (PVDF) membrane, followed by blocking in TBS 0.05% Tween 20 containing 3% BSA, and incubation with Streptavidin-Peroxidase polymer (1/10,000) (S2438, Sigma-Aldrich) in TBS 0.05% Tween 20, 3% BSA. Loading controls were obtained by labelling PVDF membranes with 0.1% Coomassie R350 (GE Healthcare) in 60% methanol in water during 1 min, followed by destaining in 10% acetic acid–50% ethanol in water. Caveolin-1, CAIX, HIF-1α, HIF-2α, α-tubulin and actin were probed after membrane blocking in TBS 0.05% Tween 20 containing 5% milk by incubation with the following primary antibodies overnight at 4 °C: Anti-caveolin-1 ab2910 (1/4,000; Abcam), anti-CAIX M75 (1/200; BioScience Slovakia), anti-HIF-1α #628480 (1/1,00; Genetex), anti- HIF-2α ab199 (1/500; Abcam), anti-α-tubulin ab7291 (1/10,000; Abcam), anti-β-actin ab8227 (1/5000; Abcam), and then incubated with horseradish peroxidase conjugated anti-rabbit (1/10,000) (7074, Cell Signalling Technology) or anti-mouse IgG (1/10,000) (19044, Sigma-Aldrich) secondary antibodies. Protein bands were visualized by enhanced chemiluminescence (ECL) western blotting substrate (Pierce), and their intensities were measured by densitometry using ImageJ software.
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