The pCEFL HA, pCEFL HA MAPK15 [18 (link)], pCEFL HA MAPK15_AXXA and pCEFL HA MAPK15_KD [25 (link)] expression vectors have been previously described. The corresponding cDNA (MAPK15_WT, MAPK15_AXXA and MAPK15_KD), resistant to siRNA for MAPK15 (siMAPK15-1), were synthesized (GeneART, Thermo Fischer Scientific) with “synonymous” mutations in the sequence recognized by the siRNA and cloned in the pCEFL HA expression vector. The identity and integrity of all vectors was confirmed by DNA sequencing. Cis-platin (Cis-Pt; Sigma Aldrich, Milan, Italy) was used at a final concentration of 1 μM. Bafilomycin A1 (Santa Cruz Biotechnology, Heidelberg, Germany) and RO31-8220 (Merck Millipore, Vimodrone, Italy) were used at a final concentration of 100 nM.
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