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In Vitro Micronucleus Technique to Predict Chemosensitivity

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Chemosensitivity: Volume II

Part of the book series: Methods in Molecular Medicine™ ((MIMM,volume 111))

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Abstract

The study of DNA damage at the chromosome level is an essential part of genetic toxicology because chromosomal mutation is an important event in carcinogenesis. The micronucleus assays have emerged as one of the preferred methods for assessing chromosome damage because they enable both chromosome loss and chromosome breakage to be measured reliably. Because micronuclei can only be expressed in cells that complete nuclear division a special method was developed that identifies such cells by their binucleate appearance when blocked from perform ing cytokinesis by cytochalasin-B, a microfilament-assembly inhibitor. The cytokinesis-block micronucleus (CBMN) assay allows better precision because the data obtained are not con founded by altered cell division kinetics caused by cytotoxicity of agents tested or suboptimal cell culture conditions. The method is now applied to various cell types for population monitor ing of genetic damage, screening of chemicals for genotoxic potential, and for specific purposes such as prediction of the radiosensitivity of tumors and interindividual variation in radiosensi tivity. In its current basic form the CBMN assay can provide, using simple morphological crite ria, the following measures of genotoxicity and cytotoxicity: chromosome breakage, chromosome loss, chromosome rearrangement (nucleoplasmic bridges), cell division inhibition, necrosis, and apoptosis. The cytosine-arabinoside modification of the CBMN assay allows for measurement of excision-repairable lesions. The use of molecular probes enables chromosome loss to be distin guished from chromosome breakage and, importantly, nondisjunction in nonmicronucleated bin ucleated cells can be measured efficiently.

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  1. CSIRO Health Science and Nutrition, South Australia, Australia

    Michael Fenech

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  1. Michael Fenech
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  1. Garden State Cancer Center, Belleville, NJ, USA

    Rosalyn D. Blumenthal

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Fenech, M. (2005). In Vitro Micronucleus Technique to Predict Chemosensitivity. In: Blumenthal, R.D. (eds) Chemosensitivity: Volume II. Methods in Molecular Medicine™, vol 111. Humana Press, Totowa, NJ. https://doi.org/10.1385/1-59259-889-7:003

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  • DOI: https://doi.org/10.1385/1-59259-889-7:003

  • Publisher Name: Humana Press, Totowa, NJ

  • Print ISBN: 978-1-58829-586-6

  • Online ISBN: 978-1-59259-889-2

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