摘要：OBJECTIVE Ascorbic acid(AA),commonly known as vitamin C,is a small molecular widely distributed in in food and traditional herbs.Recently,there are some literatures reported that high concentration AA could selectively kill the cancer cells but not the normal cells.This study was designed to explore the underlying mechanisms.METHODS Colorectal cancer line cells were cultured and treated with AA.The cytotoxic,intracellular ATP level,reactive oxygen species,calcium,were determined with commercial kits and fluorescent probes.RESULTS High concentration of AA induced cell death in HCT116 and HT29 colorectal cancer cells in concentration-and time-dependent manner.AA treat⁃ment induced ATP decrease,LDH release,cell swollen and loss of plasma membrane integrity.Pharmacological inhibi⁃tors for apoptosis,necroptosis,autophagy,pyroptosis and oncosis showed no effect on AA-induced cell death.Further⁃more,ROS level increase and intracellular calcium(Ca2+)accumulation were observed after AA treatment.ROS scavenger N-acetyl cysteine(NAC),intracellular calcium chelator BAPTA-AM and intracellular calcium inhibitor 2-aminoethoxy⁃diphenyl borate(2-APB)could attenuate the cell death induced by AA.NAC could attenuate both ROS increase and intracellular Ca2+accumulation induced by AA,while BAPTA-AM could only attenuate intracellular Ca2+accumulation.In addition,high concentration AA induced mitochondrial damage and mitochondrial ROS generation.CONCLUSION AA induces Ca2+-dependent programed necrosis mediated by ROS.Our study provided new insights into high concentration AA induced cell death in human colon cancer cells.

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