The oxidant defense system in human neuroblastoma IMR-32 cells predifferentiation and postdifferentiation to neuronal phenotypes |
| |
Authors: | Erlejman Alejandra G Oteiza Patricia I |
| |
Institution: | (1) Instituto de Química y Fisicoquímica Biológicas (UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina |
| |
Abstract: | Differentiated neurons were investigated for their susceptibility to oxidative damage based on variations in the oxidant defense system occurring during differentiation. The main antioxidant enzymes and substances in human neuroblastoma (IMR-32) cells were evaluated pre- and post-differentiation to a neuronal phenotype. The activity of CuZn superoxide dismutase (CuZnSOD) and Mn superoxide dismutase (MnSOD) and the concentration of CuZnSOD were higher, but the activity and concentration of catalase were lower after differentiation. Differentiated cells had higher activity of glutathione peroxidase (GPx), lower concentration of total glutathione, a higher ratio of oxidised/reduced glutathione and lower activity of glucose-6-phosphate dehydrogenase than undifferentiated cells. We conclude that differentiated neuronal cells may be highly susceptible to oxidant-mediated damage based on the relative activities of the main antioxidant enzymes and on a limited capacity to synthesise and/or recycle glutathione. |
| |
Keywords: | Neuron free radicals differentiation antioxidants IMR-32 cells superoxide dismutase glutathione |
本文献已被 PubMed SpringerLink 等数据库收录! |