| JIN Wen-sen,XIAO Lin-lin,WANG Juan,et al.Increased radiosensitivity of gliomas C6 cell and osteosarcoma MG63 cells by triterpene acids of loquat leaf[J].Chinese Journal of Radiological Medicine and Protection,2012,32(6):597-601 |
| Increased radiosensitivity of gliomas C6 cell and osteosarcoma MG63 cells by triterpene acids of loquat leaf |
| Received:April 01, 2012 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.06.009 |
| KeyWords:Triterpene acids of loquat leaf Radiosensitivity Tumor |
| FundProject:安徽省自然科学基金(11040606M210);安徽省教育厅重点项目(kj2010A189);中国博士后基金面上项目(20100470822) |
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| Abstract:: |
| Objective To study the increased radiosensitivity of tumor cells by triterpene acids of loquat leaf (TAL) and mechanism. Methods C6 and MG63 cells were pretreated by TAL, and then were exposed to X-rays at 1, 2, 3, 5, 7 Gy. Clonogenic assay was used to evaluate those tumor cells survival fraction (SF) to calculate the sensitization enhancement ratios (SER) of TAL. The cellular micronuclei ratios of tumor cells were analyzed by micronuclei assay. Additionally, the changes of Rad51 and XRCC4 levels were observed by RT-PCR and Western blot. Results D0 values were decreased to 1.31 and 2.85 Gy in C6 and MG63 cells by TAL pretreatment respectively. The SER value of the effect of TAL on C6 and MG63 cells was 1.73 and 2.04, respectively. There was a statistical difference in the cellular micronuclei ratios between tumor cells with TAL above 2 Gy and those without TAL (C6:t=-8.372--2.476, P<0.05; MG63:t=-4.03--2.557,P<0.05). TAL attenuated the expression of XRCC4 at transcriptional and translational level, but not for Rad51, a key gene in homologous recombination repair (HRR). Conclusions TAL pretreatment could increase the lethal effect of X-rays on tumor cells in vitro. The mechanism might be involved in the inhibition of non-homologous end joining (NHEJ). |
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