tailieunhanh - Báo cáo khoa học: "MicroRNA expression after ionizing radiation in human endothelial cells"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: MicroRNA expression after ionizing radiation in human endothelial cells. | Wagner-Ecker et al. Radiation Oncology 2010 5 25 http content 5 1 25 RADIATION ONCOLOGY RESEARCH Open Access MicroRNA expression after ionizing radiation in human endothelial cells A A I . I I I t A i - 1 1 -1 1 II. tAfi 1 A A I I 11 I 12 . - I I I 1 Mechthild Wagner-Ecker Christian Schwager Ute Wirkner Amir Abdollahi Peter E Huber Abstract Background Endothelial cells EC in tumor and normal tissue constitute critical radiotherapy targets. MicroRNAs have emerged as master switchers of the cellular transcriptome. Here we seek to investigate the role of miRNAs in primary human dermal microvascular endothelial cells HDMEC after ionizing radiation. Methods The microRNA status in HDMEC after 2 Gy radiation treatment was measured using oligo-microarrays covering 361 miRNAs. To functionally analyze the role of radiation-induced differentially regulated miRNAs cells were transfected with miRNA precursor or inhibitor constructs. Clonogenic survival and proliferation assays were performed. Results Radiation up-regulated miRNA expression levels included let-7g miR-16 miR-20a miR-21 and miR-29c while miR-18a miR-125a miR-127 miR-148b miR-189 and miR-503 were down-regulated. We found that overexpression or inhibition of let-7g miR-189 and miR-20a markedly influenced clonogenic survival and cell proliferation per se. Notably the radiosensitivity of HDMEC was significantly influenced by differential expression of miR-125a -127 -189 and let-7g. While miR-125a and miR-189 had a radioprotective effect miR-127 and let-7g enhanced radiosensitivity in human endothelial cells. Conclusion Our data show that ionizing radiation changes microRNA levels in human endothelial cells and moreover exerts biological effects on cell growth and clonogenicity as validated in functional assays. The data also suggest that the miRNAs which are differentially expressed after radiation modulate the intrinsic radiosensitivity of endothelial cells in subsequent irradiations. This .

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