Recombinant mouse proteins (Chi3l1, rIL13Rα2, RANKL, and M-CSF) were provided by R&D systems (USA). The Gibco BRL (USA) provided minimal essential medium alpha (α-MEM), fetal bovine serum (FBS), 0.25% EDTA-trypsin, and penicillin-streptomycin. RiboFECTTM transfection reagent, Chi3l1-siRNA, and IL13Rα2-siRNA came from RiboBio company (China). Primary antibodies targeting p-Akt (Ser473), Akt, p-ERK, ERK, p-JNK, JNK, p-P38, P38, p-P65, P65, and GAPDH were obtained from Cell Signaling Technology (CST, USA). The Abcam (USA) provided the primary antibody recognizing Chi3l1, which was used for immunofluorescence (IF) and western blot (WB). The primary antibody that recognized Chi3l1 used for co-immunoprecipitation (IP) and IL13Rα2 for IF and WB came from R&D systems (USA). Santa Cruz (USA) offered the primary antibody that recognized IL13Rα2 for IP.
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