Involvement of DNA replication in ultraviolet-induced apoptosis of mammalian cells

Luis Francisco Zirnberger Batista, Vanessa Chiganças, Gabriela Brumatti, Gustavo Pessini Amarante-Mendes, Carlos Frederico Martins Menck

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Exposure of cells to ultraviolet (UV) light damages the genome and the persistence of DNA lesions triggers apoptosis in mammalian cells. RNA transcription blockage by DNA damage is believed to be implicated in signaling for UV-induced apoptosis, but the role played by DNA replication in this process is still unclear. To address this point, we have employed the DNA polymerase inhibitor aphidicolin in UV-irradiated wild-type and XPB-mutated Chinese hamster ovary cells. The data obtained with synchronized cells indicate that induction of apoptosis by UV light is independent of the cell cycle phase. Nevertheless, cells treated with aphidicolin after UV exposure showed a significant prevention of apoptosis induction when compared to proliferating cells. These results were observed in both DNA-repair proficient and deficient cells, indicating that the prevention of apoptosis by aphidicolin is independent of the cells' ability to repair the photolesions caused by UV. Taken together, these data suggest that replication of damaged DNA also leads to critical events signaling for UV-induced cell death.

Original languageEnglish
Pages (from-to)1139-1148
Number of pages10
JournalApoptosis
Volume11
Issue number7
DOIs
StatePublished - Jul 1 2006
Externally publishedYes

Keywords

  • Aphidicolin
  • Apoptosis
  • DNA replication
  • Ultraviolet

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