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• W2123628489 startingPage "605" @default.
• W2123628489 abstract "A method is described for the inclusion of apoptotic and necrotic cells in the cell counts obtained in the cytokinesis-block micronucleus (CBMN) assay, which is conventionally used solely for the assessment of chromosome breakage, chromosome loss and frequency of dividing cells. The morphological criteria for the recognition and discrimination between necrotic, apoptotic and viable cells are described. Using this comprehensive method we have evaluated the cytotoxic and genotoxic effects of hydrogen peroxide (0-100 microM) in lymphocytes exposed in RPMI 1640 medium. The results obtained indicated significant (P < 0.05) correlations between hydrogen peroxide concentration and the frequency of micronucleated cells (r = 0.39), necrotic cells (r = 0.73), apoptotic cells (r = -0.26) and binucleated cells (r = -0.55). Almost similar results were obtained using the cytosine arabinoside modification of the CBMN assay, which enables excision-repaired sites to be converted to micronuclei. Some of the above end-points were significantly (P < 0.05) correlated with each other (necrosis and apoptosis, R = -0.39; necrosis and micronucleated cell frequency, R = 0.46; necrosis and binucleated cells, R = -0.78; apoptosis and binucleated cells, R = 0.32). It was therefore necessary to use multiple regression analysis to identify the main event induced by hydrogen peroxide, which was necrosis (beta = 0.57, P = 0.0001) and not micronucleus formation (beta = 0. 15, P = 0.1332). Using an ELISA assay we showed that hydrogen peroxide did not induce 8-hydroxydeoxyguanosine. Our data show that the proposed comprehensive test system may provide a better procedure for classifying potential toxic chemicals and enable discrimination between agents that primarily induce cytotoxic effects as opposed to genotoxic effects. The integration of apoptosis and necrosis into the micronucleus assay may also be of practical use in radiosensitivity studies." @default.
• W2123628489 created "2016-06-24" @default.
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• W2123628489 date "1999-11-01" @default.
• W2123628489 modified "2023-10-13" @default.
• W2123628489 title "Necrosis, apoptosis, cytostasis and DNA damage in human lymphocytes measured simultaneously within the cytokinesis-block micronucleus assay: description of the method and results for hydrogen peroxide" @default.
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• W2123628489 doi "https://doi.org/10.1093/mutage/14.6.605" @default.
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