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Título: | Effect of caffeine on in vivo processing of alkylated bases in proliferating plant cells |
Autor: | Pincheira, Juana; López-Sáez, J. F.; Carrera, Pilar; Navarrete, M. H.; Torre, Consuelo de la CSIC | Fecha de publicación: | oct-2003 | Editor: | John Wiley & Sons | Citación: | Cell Biology International 27(10): 837-843 (2003) | Resumen: | DNA damage was induced by either 2 mM ethylmethanesulfonate or 1 Gy of γ-irradiation in Allium cepa L. root meristems. The percentage of DNA that migrated towards the anode during microelectrophoresis after alkali denaturation (pH∼13.5) of the isolated nuclei (comet assay) reflects the amount of single strand breaks present in them. There was some DNA migration (12.8±2.4%) in untreated roots. This percentage doubled at the end of 1. 5 h treatment with the mono-functional alkylating agent 2 mM ethylmethanesulfonate, and trebled after a single exposure to 1 Gy of γ-rays. A proportion of the DNA migration caused by these two treatments was reversed (repaired) by a 2 h long period of in vivo recovery. However, when 5 mM caffeine was applied after removal of the alkylating agent, the amount of DNA migrating to the comet tail over the same 2 h period was almost double that at the onset of recovery. In both control and irradiated nuclei, caffeine also increased the initial level of DNA migration in the comet assay, but to a lesser extent. These results indicate that caffeine increases the DNA damage that accumulates during the processing of alkylated bases and, to a lesser extent, of the DNA bases damaged by γ-irradiation. Thus, the potentiation effect of caffeine on induced chromosomal damage may not just be due to caffeine-induced cancellation of the G2 checkpoint, but also to a direct effect this methylxantine has on the processing of DNA damage. © 2003 Elsevier Ltd. All rights reserved. | Versión del editor: | http://dx.doi.org/10.1016/S1065-6995(03)00169-0 | URI: | http://hdl.handle.net/10261/245703 | DOI: | 10.1016/S1065-6995(03)00169-0 | Identificadores: | doi: 10.1016/S1065-6995(03)00169-0 issn: 1065-6995 e-issn: 1095-8355 |
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