Protein Information

ID 8
Name superoxide dismutase
Synonyms IPO B; Indophenoloxidase B; MNSOD; Manganese superoxide dismutase; Manganese containing superoxide dismutase; Mangano superoxide dismutase; Mn superoxide dismutase; Mn SOD…

Compound Information

ID 1341
Name rotenone
CAS

Reference

PubMed Abstract RScore(About this table)
8989910 Otero G, Avila MA, Emfietzoglou D, Clerch LB, Massaro D, Notario V: Increased manganese superoxide dismutase activity, protein, and mRNA levels and concurrent induction of tumor necrosis factor alpha in radiation-initiated Syrian hamster cells. Mol Carcinog. 1996 Dec;17(4):175-80.
The levels of the antioxidant enzyme manganese superoxide dismutase (Mn-SOD) are frequently decreased in tumor cells and increased in normal cells upon treatment with ionizing radiation. We studied Mn-SOD at different stages during the neoplastic conversion of radiation-initiated Syrian hamster embryo HDR-3 cells. Mn-SOD activity and the concentration of Mn-SOD protein and mRNA increased gradually during the malignant transformation of HDR-3 cells after radiation exposure; fully neoplastic cells showed greater Mn-SOD levels than preneoplastic and normal 84-3 cells. Inhibitors of superoxide (SO) anion production (thenoyltrifluoroacetone and rotenone) decreased the concentration of Mn-SOD mRNA, raising the possibility that the generation of SO radicals participated in the upregulation of Mn-SOD in cells transformed by exposure to radiation. We observed an increase in the concentration of tumor necrosis factor alpha (TNF alpha) in HDR-3 cells relative to mock-irradiated cells. Together with the observation that TNF alpha stimulates the production of SO by mitochondria and increases the level of Mn-SOD mRNA in other experimental systems, our results suggest that as normal 84-3 cells undergo malignant transformation induced by ionizing radiation they produce TNF alpha, to which the cells respond by increasing the concentration of Mn-SOD mRNA and protein and the activity of the enzyme.
2(0,0,0,2)