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dc.contributor.authorCrott, J.-
dc.contributor.authorFenech, M.-
dc.identifier.citationCarcinogenesis, 1999; 20(6):1035-1041-
dc.description.abstractWe investigated whether high dose vitamin C influenced the viability of human lymphocytes in plasma, in the presence or absence of hydrogen peroxide (512 microM) by scoring necrotic, apoptotic and micronucleated cells using the cytokinesis-block micronucleus assay. The in vitro results showed that vitamin C (0.57-2.27 mM) on its own had no effect on the above parameters. However, in the presence of hydrogen peroxide vitamin C significantly reduced the number of dividing cells and apoptosis, and increased necrosis and micronucleated cells. A double-blind placebo controlled intervention, with a cross-over, involving 11 male subjects, aged 20-40 years, was performed to determine whether high plasma vitamin C concentration resulting from vitamin C supplementation promotes or protects against genetic damage and cell death ex vivo. Venous blood samples were collected before and after an anti-oxidant-poor diet which reduced plasma vitamin C concentrations by 15% (P < 0.05), and was followed with a 2 g vitamin C supplement, which raised plasma concentrations by 115 and 125% (0.12 mM) after 2 and 4 h, respectively (P < 0.05). Plasma collected post-vitamin C ingestion did not alter micronucleus expression or apoptosis in control or hydrogen peroxide-treated lymphocytes, but it moderately increased necrosis (P < 0.08). Analysis of combined data showed that necrotic cell frequency correlated positively with micronucleated cell frequency (r = 0.66, P < 0.0001) and negatively with apoptotic cell frequency (r = -0.81, P < 0.0001). Overall, vitamin C supplementation did not appear to cause DNA damage under normal physiological conditions nor did it protect cells against hydrogen peroxide-induced toxicity.-
dc.description.statementofresponsibilityCrott, Jimmy W ; Fenech, Michael-
dc.publisherOXFORD UNIV PRESS-
dc.subjectDNA Damage-
dc.subjectChromosome Aberrations-
dc.subjectHydrogen Peroxide-
dc.subjectAscorbic Acid-
dc.subjectDose-Response Relationship, Drug-
dc.titleEffect of vitamin C supplementation on chromosome damage, apoptosis and necrosis ex vivo-
dc.typeJournal article-
dc.identifier.orcidFenech, M. [0000-0002-8466-0991]-
Appears in Collections:Aurora harvest 7
Physiology publications

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