Photosensitizer is a key element of photodynamic therapy (PDT). Currently, only limited numbers of photosensitizers are available for antitumor PDT in China. YLG-1 (Ang-Da-Fen-Qi) is a newly developed second-generation chlorin-type photosensitizer. In this preliminary study, the killing effect of combination of YLG-1 and 652 nm diode laser on human nasopharyngeal carcinoma cells and human ovarian cancer cells were investigated. In vitrostudy suggests that YLG-1 mediated PDT activity has strong cancer cell killing effect and therefore potentials for antitumor PDT applications.
Early studies suggest that some PDT photosensitizers can be used as sonosensitizer for sonodynamic therapy (SDT). In this study, sonodynamic effects of a novel water soluble chlorin YLG-1 were evaluated. SDT of YLG-1 solution was carried out using an ultrasound transducer of 450 KHz at 2.0 W/cm2 for 0 – 600 s. Comparison of spectroscopic profiles of YLG-1 before and after SDT demonstrated that sonification could cause the reduction of YLG-1 absorbance and fluorescence emission but did not cause obvious change of the Raman spectrum. No significant by-products were identified from spectroscopic study. Nevertheless, this study demonstrated that the sonification mediated sensitizer fluorescence bleaching effect could be partially blocked by the addition of NaN3, which suggests a possible involvement of singlet oxygen in the process of sonification of YLG-1 compound.
Photodynamic therapy (PDT) utilizes the combined action of photosensitizer, light, and molecular oxygen to generate reactive singlet oxygen (1O2) to treat various diseases. Photosensitizer is a key component in PDT and its singlet oxygen quantum yield determines the effectiveness of its photodynamic reaction. This study evaluated the singlet oxygen production of a novel water soluble chlorin photosensitizer (YLG-I) using a 1O2-specificfluorescence probe - Singlet Oxygen Sensor Green reagent (SOSG). The spectra and singlet oxygen luminescence in different solvents were evaluated using mTHPC as a reference. It was estimated and verified that the singlet oxygen quantum yield of the new photosensitizer YLG-I was at the same level of the potent chlorin sensitizer mTHPC. Preliminary evaluation suggested that YLG-I was a promising photosensitizer for PDT.
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