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Long noncoding RNA ATB participates in the development of renal cell carcinoma by downregulating p53 via binding to DNMT1.
Journal of Cellular Physiology 2018 December 9
Long noncoding RNA (lncRNA) exerts an essential role in the pathological processes of many diseases. Our previous study found that lncRNA ATB was highly expressed in renal cell carcinoma (RCC). Cell Counting Kit-8 (CCK-8), 5-ethynyl-2'-deoxyuridine (EdU), and migration-related assays were conducted to access the regulatory effects of lncRNA ATB on proliferative and migratory capacities of RCC cells. Flow cytometry was carried out to determine cell cycle and apoptosis influenced by lncRNA ATB. The interaction among lncRNA ATB, DNMT1, and p53 was evaluated through RNA immunoprecipitation (RIP), chromatin immunoprecipitation (ChIP), and western blot analyses. The results showed that lncRNA ATB knockdown in RCC cell line ACHN inhibited proliferative and migratory capacities and promoted apoptosis. Meanwhile, overexpression of lncRNA ATB in RCC cell line A-498 promoted proliferative and migratory capacities but inhibited apoptosis. RIP and ChIP assays confirmed that lncRNA ATB can bind to DNMT1 and stabilize its expression; meanwhile, it can promote the binding of DNMT1 to p53. Overexpression of p53 partially reversed the proliferative and migratory changes caused by lncRNA ATB. To sum up, our study revealed that high expression of lncRNA ATB could accelerate the proliferative and migratory rates of RCC cells and inhibit cell apoptosis through downregulating p53 via binding to DNMT1.
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