The lung tissue was lysed by radio-immunoprecipitation assay buffer (Thermo Fisher Scientific) supplemented with protease inhibitors, after which protein level was evaluated by a bicinchoninic acid protein detection kit (Thermo Fisher Scientific). The protein was analyzed with sodium dodecyl sulfate polyacrylamide gel electrophoresis. Subsequently, the protein sample on the polyvinylidene fluoride membrane was blocked, combined with primary antibodies Rtn3 and GAPDH (both from Santa Cruz Biotechnology, CA, USA), and with peroxidase-labeled secondary antibody (Abcam, CA, USA). The protein bands were analyzed with Odyssey 3.0 [23 (link)].
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