PDP1 and melanoma: Following the intriguing results of the analysis of PDH phosphorylation, which suggest that only DMBC12 cells might rely on mitochondrial metabolism in normoxic and hyperoxic conditions, we investigated the influence of oxygen level on the expression of PGC1α responsible for immediate cell adaptation for high energetic demands, and MITF, one of the key regulators of PGC1α expression in melanoma cells.