Photodamage of the cells in culture sensitized with bilirubin

3rd International School and Conference on Optoelectronics, Photonics, Engineering and Nanostructures (Saint Petersburg OPEN 2016)

Kozlenkova, O.A.^1 ; Plavskaya, L.G.^1 ; Mikulich, A.V.^1 ; Leusenko, I.A.^1 ; Tretyakova, A.I.^1 ; Plavskii, V. Yu^1

Laboratory of Organic Heterogeneous Media, B.I. Stepanov Institute of Physics of NAS of Belarus, Minsk, Belarus^1

关键词: Damaging effects;    Emission bands;    Exponential type;    Logarithmic growth;    Photochemical stability;    Photodynamic process;    Photoproducts;    Singlet oxygen;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/741/1/012063/pdf
DOI  :  10.1088/1742-6596/741/1/012063

来源: IOP

【 摘 要 】

It has been shown that exposure to radiation of LED sources of light with an emission band maximum at about 465 and 520 nm having substantially identical damaging effects on animal cells in culture, that are in a logarithmic growth phase and preincubated with pigment. Photobiological effect is caused by photodynamic processes involving singlet oxygen generated by triplet excited sensitizer. Mono-exponential type dependence of cell survival on the energy dose indicates that it is bilirubin that acts as a sensitizer but not its photoproducts. The inclusion of bilirubin in the cells, where it is primarily localized in the mitochondria cells, it is accompanied by multiple amplification photochemical stability compared to pigment molecules bound with albumin.