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Medan J, Sleebs BE, Lackovic K, Watson KG, Evison BJ, Phillips DR, Cutts SM. Development of an automated assay for accelerated in vitro detection of DNA adduct-inducing and crosslinking agents. Bioorg Med Chem Lett 2021; 35:127813. [PMID: 33486050 DOI: 10.1016/j.bmcl.2021.127813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/21/2020] [Accepted: 01/17/2021] [Indexed: 10/22/2022]
Abstract
Current techniques for the identification of DNA adduct-inducing and DNA interstrand crosslinking agents include electrophoretic crosslinking assays, electrophoretic gel shift assays, DNA and RNA stop assays, mass spectrometry-based methods and 32P-post-labelling. While these assays provide considerable insight into the site and stability of the interaction, they are relatively expensive, time-consuming and sometimes rely on the use of radioactively-labelled components, and thus are ill-suited to screening large numbers of compounds. A novel medium throughput assay was developed to overcome these limitations and was based on the attachment of a biotin-tagged double stranded (ds) oligonucleotide to Corning DNA-Bind plates. We aimed to detect anthracycline and anthracenedione DNA adducts which form by initial non-covalent intercalation with duplex DNA, and subsequent covalent adduct formation which is mediated by formaldehyde. Following drug treatment, DNA samples were subjected to a denaturation step, washing and then measurement by fluorescence to detect remaining drug-DNA species using streptavidin-europium. This dissociation-enhanced lanthanide fluorescent immunoassay (DELFIA) is a time-resolved fluorescence intensity assay where the fluorescence signal arises only from stabilised drug-DNA complexes. We applied this new methodology to the identification of anthracycline-like compounds with the ability to functionally crosslink double-strand oligonucleotides. The entire procedure can be performed by robotics, requiring low volumes of compounds and reagents, thereby reducing costs and enabling multiple compounds to be assessed on a single microtitre plate.
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Affiliation(s)
- Jelena Medan
- La Trobe Institute for Molecular Science, La Trobe University, Victoria 3086, Australia; Walter and Eliza Hall Institute, Parkville, Victoria 3052, Australia
| | - Brad E Sleebs
- Walter and Eliza Hall Institute, Parkville, Victoria 3052, Australia; Department of Medical Biology, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Kurt Lackovic
- Walter and Eliza Hall Institute, Parkville, Victoria 3052, Australia; Department of Medical Biology, The University of Melbourne, Parkville, Victoria 3010, Australia; Cancer Trials Australia, Melbourne, Victoria 3000, Australia
| | - Keith G Watson
- Walter and Eliza Hall Institute, Parkville, Victoria 3052, Australia
| | - Benny J Evison
- La Trobe Institute for Molecular Science, La Trobe University, Victoria 3086, Australia; Nyrada Inc, 828 Pacific Highway, Gordon, NSW 2072, Australia
| | - Don R Phillips
- La Trobe Institute for Molecular Science, La Trobe University, Victoria 3086, Australia
| | - Suzanne M Cutts
- La Trobe Institute for Molecular Science, La Trobe University, Victoria 3086, Australia.
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