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- W2106924398 abstract "Photodynamic therapy (PDT) is a method for treating pre-cancerous and cancerous lesions of the skin, bladder and oral cavity. However, tumour recurrence after PDT remains problematic despite good initial response. Some studies have shown that PDT induces vascular endothelial growth factor (VEGF) expression in human oral squamous cell carcinoma and other organs. However, little is known about VEGF expression applied to PDT in human carcinoma cell lines. No studies have been conducted of PDT using Npe6 (Npe6-mediated PDT), a second-generation photosensitizer, in the human oral carcinoma cell line, HSC-3 cells. We investigated the expression of VEGF, c-jun and c-fos proto-oncogenes in HSC-3 cells in response to Npe6-mediated PDT. We also addressed the possibility that oxidative damage induced by PDT could lead to an angiogenic response, via VEGF expression. Reverse transcription polymerase chain reaction (RT-PCR) analysis revealed that Npe6-mediated PDT induced the expression of mRNAs for VEGF, c-jun and c-fos in time- and concentration-dependent manners. Desferrioxamine (DFX), an iron chelator, induced VEGF expression, but the expression pattern was different to that of Npe6-mediated PDT. The expression mRNAs for VEGF, c-jun and c-fos induced by Npe6-mediated PDT were inhibited by SB203580, p38 MAPK inhibitors, and the expression of VEGF mRNA was inhibited by cycloheximide (CHX), a protein synthesis inhibitor. The c-jun mRNA expression was inhibited, whereas the c-fos mRNA expression was enhanced by N-acetyl-l-cysteine (NAC), a free radical scavenger. We conclude that Npe6-mediated PDT induces the expression of VEGF, c-jun and c-fos in human oral carcinoma cell line, HSC-3 cell, and at least partly, through the activation of p38 MAPK." @default.
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- W2106924398 date "2007-07-01" @default.
- W2106924398 modified "2023-10-16" @default.
- W2106924398 title "Expression of vascular endothelial growth factor by photodynamic therapy with mono-l-aspartyl chlorin e6 (NPe6) in oral squamous cell carcinoma" @default.
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- W2106924398 doi "https://doi.org/10.1016/j.oraloncology.2006.03.020" @default.
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