1999
DOI: 10.2307/3580142
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Ascorbic Acid Inhibits Apoptosis Induced by X Irradiation in HL60 Myeloid Leukemia Cells

Abstract: Exposure of cells to ionizing radiation can cause apoptosis. Since antioxidants have been shown to protect against radiation-induced apoptosis, in this study we have evaluated the putative protective effect of ascorbate against radiation-induced apoptosis as well as the production of peroxides in the cells. HL60 cells transport the oxidized form of ascorbic acid, dehydroascorbic acid (DHA), and accumulate reduced ascorbate. Exposure of the cells to 5-40 Gy X radiation resulted in induction of apoptosis. Preinc… Show more

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Cited by 50 publications
(27 citation statements)
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“…HL-60 cells accumulate millimolar concentrations of vitamin C, and their resistance to H 2 O 2 increases in proportion to the intracellular concentration of ascorbic acid in a dose-dependent manner. Similar results have been observed in other cell lines where preloading with ascorbic acid was shown to protect from H 2 O 2 generated by xanthine oxidase (35) and by direct treatment with H 2 O 2 or radiation (7,8,36).…”
Section: Discussionsupporting
confidence: 87%
See 1 more Smart Citation
“…HL-60 cells accumulate millimolar concentrations of vitamin C, and their resistance to H 2 O 2 increases in proportion to the intracellular concentration of ascorbic acid in a dose-dependent manner. Similar results have been observed in other cell lines where preloading with ascorbic acid was shown to protect from H 2 O 2 generated by xanthine oxidase (35) and by direct treatment with H 2 O 2 or radiation (7,8,36).…”
Section: Discussionsupporting
confidence: 87%
“…Oxidative damage has been linked to many disease states (3,4) and to the development of cancer via the oxidation of DNA bases (5,6). The role of antioxidant defenses in tumor cells themselves, however, has been poorly studied, and the role of antioxidants in neoplastic cell responses to radiation and chemotherapy is not understood completely (7)(8)(9)(10).…”
mentioning
confidence: 99%
“…37,63,64 To circumvent the in vitro pro-oxidant effects of AA, we loaded HL60 and U266 cells (which do not transport AA directly) with vitamin C by incubating them with DHA. [68][69][70] Cells loaded with vitamin C were significantly protected from As 2 O 3 toxicity. Increasing concentrations of intracellular vitamin C in HL60, U266, and RPMI-8226 cells provided increasing protection from As 2 O 3 cytotoxicity with maximum protection achieved at 2 to 8 mM intracellular AA.…”
Section: Discussionmentioning
confidence: 99%
“…These events culminate in activation of the effector caspases, including caspase-3 that cleaves a number of structural and regulatory proteins (49,50). Oxidant stress can initiate apoptosis, and this can be partly prevented by cellular anti-oxidants, including ascorbate (10,11). In our current experiments, exposure of HUVEC to NH 2 Cl or glycine-NHCl for 60 min resulted in an increase in apoptosis that was not greatly affected by ascorbate.…”
Section: Discussionmentioning
confidence: 61%