3-49 X-ray Radiation Induced Caspase-8 and Caspase-9 Activation in Human Colon Cancer Cells

摘要

Caspases as critical components in cell signaling pathways have been proved to be involved in events such asapoptosis, cell growth and differentiation. Two distinct apoptotic pathways related to the Caspase cascade have beenidentified; death receptor-induced apoptosis and mitochondrial stress-induced apoptosis. Death receptors triggerCaspase-8 and the mitochondria subsequently release apoptogenic factors (cytochrome c, Apaf-1, AIF), leading tothe activation of Caspase-9. The mitochondrial and death receptor apoptotic pathways are intimately connected[1].