Homologous recombination as a potential target for caffeine radiosensitization in mammalian cells: reduced caffeine radiosensitization in XRCC2 and XRCC3 mutants

The Dichotomous Effects of Caffeine on Homologous Recombination in Mammalian Cells

This study was initiated to examine the effects of caffeine on the DNA damage response (DDR) and homologous recombination (HR). An initial 2 h exposure to 5 mM caffeine slowed a fraction of the cells in G1, but thereafter, continued caffeine exposure permitted this cell fraction to progress through the cycle until they eventually stalled at G2/M and underwent apoptosis. This prolonged caffeine ...

Histone Acetyltransferases (HATs) Involved in Non-Homologous End Joining as a Target for Radiosensitization

Polymorphisms of Homologous Recombination RAD51, RAD51B, XRCC2, and XRCC3 Genes and the Risk of Prostate Cancer

Genetic polymorphisms in DNA repair genes may induce individual variations in DNA repair capacity, which may in turn contribute to the risk of cancer developing. Homologous recombination repair (HRR) plays a critical role in maintaining chromosomal integrity and protecting against carcinogenic factors. The aim of the present study was to evaluate the relationship between prostate cancer risk an...

Homologous recombination in mammalian cells.

Mouse LTKcells were transfected with a pair of defective Herpes simplex virus thymidine kinase ( t k ) genes. One tk gene had an 8-bp insertion mutation while the second gene had a 100-bp inversion. Extrachromosomal homologous recombination leading to the reconstruction of a functional tk gene was monitored by selecting for tk positive cells using medium supplemented with hypoxanthine/ aminopte...

Hypoxie Mammalian Cell Radiosensitization by Nitric Oxide

The bioregulatory molecule, nitric oxide (NO), was evaluated as a liypoxic cell radiosensitizer. Authentic NO gas was nearly as effective as oxygen in radiosensitizing hypoxic Chinese hamster V79 lung cells as evaluated using clonogenic assays. When NO was delivered to hypoxic Chinese hamster V79 cells using the NO-releasing agent i( ',lls),N[N(())NO| NV, radiosensitization was also observed wi...