Abstract
Aim:
To investigate the effect of antisense compounds (AS) targeting human p53 mRNA on radiosensitivity of MCF-7 cells.
Methods:
Western blotting and RT-PCR were used to analyze the protein content and mRNA level. Additionally, cell proliferation, cell cycle and cell apoptosis were all analyzed in irradiated or sham-irradiated cells.
Results:
Among the five antisense compounds (AS), AS3 was identified to efficiently inhibit p53 mRNA level and protein content. Interestingly, AS3 transfer has little effect on cell proliferation in DU-145 cells (mutant p53) after ionizing radiation (IR). In contrast, a marked increase of cell apoptosis and growth inhibition were observed in MCF-7 cells (wild-type p53), suggesting that AS3 can increase radiosensitivity of MCF-7 cells. Additionally, it was also observed that the transfection of AS3 decreased the fraction of G1 phase cells, and increased the proportion of S phase cells compared to untreated cells 24 h after IR in MCF-7 cell lines.
Conclusion:
AS3 transfection increases MCF-7 cell apoptosis induced by 5 Gy-radiation, and this mechanism maybe closely associated with abrogation of G1 phase arrest.
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Project supported by Zhejiang Province Medicine and Sanitation Research Foundation (No 2003A077).
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Dai, Lc., Wang, X., Yao, X. et al. Antisense oligonucleotide targeting p53 increased apoptosis of MCF-7 cells induced by ionizing radiation. Acta Pharmacol Sin 27, 1453–1458 (2006). https://doi.org/10.1111/j.1745-7254.2006.00405.x
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DOI: https://doi.org/10.1111/j.1745-7254.2006.00405.x
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