Example 4
Western Analysis.
Ear tissue samples (3 ear hole donuts/ear from 3 separate mice) were homogenized in radio-immunoprecipitation assay buffer (50 mM Tris-HCl pH 7.6, containing 150 mM NaCl, 1% Triton X-100, 1% sodium deoxycholate, 1 mM EDTA and 0.1% SDS) with 1 mM PMSF and a protease inhibitor cocktail (Sigma). Samples with equal amounts of protein (about 40 μg) were loaded into a NuPAGE 4-12% Bis-Tris gradient gel or 8% Bis-Tris gel (Life Technologies, Grand Island, N.Y.), electrophoresed and then electro-transferred onto a PVDF-FL membrane (Immobilon, Billerica, Mass.). The membrane was subsequently blocked with Odyssey blocking buffer (LI-COR, Lincoln, Nebr.), probed with primary antibodies (HIF1a (Ser. No. 10/006,421, Cayman Chemical, Ann Arbor, Mich.), HIF2a (NB100-132B, Novus, Littleton, Colo.), Wnt5a (BAF645, R&D System) or a-Tubulin (Sigma) overnight at 4° C., then further incubated with Alexa Fluor-labeled secondary antibodies (IRDye 800CW goat-anti rat or IRDye 800CW goat-anti rabbit (LI-COR, Lincoln, Nebr.) for 1 hr and scanned using the Odyssey system (LI-COR, Lincoln, Nebr.).