Rotenone is an inhibitor of the mitochondrial complex I electron transport chain with IC50 value of 1.7 - 2.2 μM.
Electron transport chain (ETC) is a series of compounds that transfer electrons from electron donors to electron acceptors and transfer protons (H+ ions) across a membrane. The proton gradient drives ATP synthesis. Complex I is one of the main sites of production of superoxide.
Rotenone is an inhibitor of the mitochondrial complex I electron transport chain. In the transformed cell line HEK 293 and cancer cell lines U87, rotenone (50 μM) induced cell death by 30% and 40% respectively in a dose dependent way, which was mediated by reactive oxygen species (ROS). Also, rotenone significantly induced autophagy formation [1]. In SH-SY5Y cells, rotenone induced cell apoptosis in a caspase-dependent way. Also, rotenone induced phosphorylation of p38 MAP kinase, c-Jun and JNK, which indicated activation of the p38 and JNK pathways [2]. In differentiated SH-SY5Y neuroblastoma cells, rotenone (50 nM) induced cell death by 60% and slowed mitochondrial movement. While rotenone didn’t induce the formation of resembling Lewy bodies [3].
References:
[1].? Chen Y, McMillan-Ward E, Kong J, et al. Mitochondrial electron-transport-chain inhibitors of complexes I and II induce autophagic cell death mediated by reactive oxygen species. J Cell Sci, 2007, 120(Pt 23): 4155-4166.
[2].? Newhouse K, Hsuan SL, Chang SH, et al. Rotenone-induced apoptosis is mediated by p38 and JNK MAP kinases in human dopaminergic SH-SY5Y cells. Toxicol Sci, 2004, 79(1): 137-146.
[3].? Borland MK, Trimmer PA, Rubinstein JD, et al. Chronic, low-dose rotenone reproduces Lewy neurites found in early stages of Parkinson's disease, reduces mitochondrial movement and slowly kills differentiated SH-SY5Y neural cells. Mol Neurodegener, 2008, 3: 21.
