Feline OSCC lines SCCF1, SCCF2 and SCCF3 were previously established and characterized by one of the investigators (TJR) [27 (link), 28 (link)]. The SCCF1, SCCF2 and SCCF3 cell lines were derived from a laryngeal, bone-invasive gingival and lingual SCC, respectively. Cell lines were maintained in DMEM supplemented with 10 % FBS, non-essential amino acids, sodium pyruvate, penicillin, streptomycin, L-glutamine, and HEPES (4-(2-hydroxythyl)-1-piperazineethanesolfonic acid) at 35 °C, supplemented with 5 % CO2. LLL12 was synthesized and purified as previously described and provided by Dr. Chenglong Li (College of Pharmacy, The Ohio State University) [24 (link)]. Aliquots of the stock solution were stored at -20 °C until use. The proteasome inhibitor MG132 was purchased from Calbiochem (Billerica, MA). The following antibodies were used for Western blotting and/or immunohistochemistry experiments: pSTAT3 (Y705, Cell Signaling Technology, Danvers, MA), STAT3 (Cell Signaling Technology), survivin (Novus Biologicals, Littleton, CO), pAKT (Ser473, Cell Signaling Technology), AKT (BD Biosciences, San Jose, CA) and β-actin (Santa Cruz Biotechnology, Santa Cruz, CA).
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