GSK3B and neuroblastoma: Similarly, GUO protects SH-SY5Y neuroblastoma cells against β-amyloid toxicity, by decreasing the formation of early ROS (Pettifer et al., 2004; Tarozzi et al., 2010) and against the mitochondrial oxidative stress, induced by the blockage of mitochondrial complexes, by inducing HO-1 via PI3K/Akt/GSK-3β (Dal-Cim et al., 2012).