The Organic Selenium Compound Selenomethionine Modulates Bleomycin-Induced DNA Damage and Repair in Human Leukocytes

  • Blanca LaffonEmail author
  • Vanessa Valdiglesias
  • Eduardo Pásaro
  • Josefina Méndez


The objective of this work was to evaluate the effects of selenomethionine (SeMet) on the induction, repair, and persistence of DNA damage in human leukocytes challenged with bleomycin (BLM). Comet assay was used to determine DNA strand breaks and hOGG1 for the specific recognition of oxidative damage. Leukocytes were (A) stimulated with phytohemagglutinin, (B) damaged with BLM, and (C) incubated to allow DNA repair. Comet assay was performed after each phase. SeMet (50 μM) was supplemented either during phase A, B, or C, or AB, or ABC. Treatment with SeMet decreased BLM-induced stand breaks when added during phase AB. Results obtained after the repair period indicate that SeMet favors repair of DNA damage especially when applied during phase AB. The comparison between DNA damage before and after repair showed that BLM-induced damage was repaired better in the presence of SeMet. Our results showed antigenotoxic effect of SeMet on BLM-induced DNA and also on repair and persistence of this damage when applied before and simultaneously with BLM.


Selenomethionine Bleomycin Comet assay Oxidative damage Antigenotoxicity 



This work was funded by a grant from the Xunta de Galicia (INCITE08PXIB106155PR). V. Valdiglesias was supported by a fellowship from the University of A Coruña.


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Copyright information

© Humana Press Inc. 2009

Authors and Affiliations

  • Blanca Laffon
    • 1
    Email author
  • Vanessa Valdiglesias
    • 1
    • 2
  • Eduardo Pásaro
    • 1
  • Josefina Méndez
    • 2
  1. 1.Toxicology Unit, Department of PsychobiologyUniversity of A Coruña, Edificio de Servicios Centrales de InvestigaciónA CoruñaSpain
  2. 2.Department of Cell and Molecular Biology, Faculty of SciencesUniversity of A CoruñaA CoruñaSpain

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