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Radiat Environ Biophys. 2001 Mar;40(1):77-82.

He-Ne laser irradiation protects B-lymphoblasts from UVA-induced DNA damage.

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  • 1Biomedical Applications Section, Laser R & D, Block D, Center for Advanced Technology, Indore 452013, India.


The effect of He-Ne laser (632.8 nm) pre-irradiation on UVA (343 nm)-induced DNA damage in the human B-lymphoblast cell line NC37 was investigated using the comet assay. He-Ne laser pre-irradiation was observed to result in a dose-dependent decrease in UVA-induced DNA damage. This effect was also found to be dependent on the incubation period between He-Ne laser pre-irradiation and the UVA exposure. Whereas the control cells with a higher DNA damage point to an initial ability of faster repair, both the control and the He-Ne laser pre-irradiated cells subsequently show the same rate of DNA repair. The results suggest that He-Ne laser irradiation protect the cells from UVA-induced DNA damage primarily through an influence on processes that prevent an initial DNA damage.

[PubMed - indexed for MEDLINE]
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