NDUFS3 promotes proliferation via glucose metabolism reprogramming inducing AMPK phosphorylating PRPS1 to increase the purine nucleotide synthesis in melanoma

Abstract NADH dehydrogenase [ubiquinone] iron-sulfur protein 3 (NDUFS3) is the core subunit of the respiratory chain complex I (CI). We found NDUFS3 were abnormally elevated in human melanoma and promoted melanoma proliferation. Furthermore, NDUFS3 could promote the oxidative phosphorylation (OXPHOS) and the pentose phosphate pathway (PPP), as well as attenuated glycolysis. As NDUFS3-mediated the metabolic changes of OXPHOS and glucose metabolism, melanoma cells produced more ATP, resulting in the inhibition of AMP kinase (AMPK). AMPK induced phosphoribosyl pyrophosphate synthetase1 (PRPS1) phosphorylation, which resulted in suppressed PRPS1 activity. Briefly, the NDUFS3-AMPK-PRPS1 signaling axis coupled OXPHOS, glucose metabolism, and purine nucleotide biosynthesis to regulate melanoma proliferation. Our study highlighted an unrecognized role for NDUFS3 in melanoma, which might be used as a potential therapeutic target for the treatment of this type of cancer.