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Chinese Journal of Lung Diseases(Electronic Edition) ›› 2021, Vol. 14 ›› Issue (05): 559-563. doi: 10.3877/cma.j.issn.1674-6902.2021.05.003

• Original Article • Previous Articles     Next Articles

Study on the mechanism of miR-515-5p enhanced the cisplatin sensitivity of NSCLC A549/DDP cells via targeting RING1

Rui Xu1, Yong Qian2, Haiyan Zhang3   

  1. 1. Department of Respiratory and critical medicine, First Affiliated Hospital of Anhui Medical University, Hefei 230022, China
    2. Department of Oncology, First Affiliated Hospital of Anhui Medical University, Hefei 230022, China
    3. Daytime Ward of Oncology, First Affiliated Hospital of Anhui Medical University, Hefei 230022, China
  • Received:2021-04-11 Online:2021-10-25 Published:2021-11-12

Abstract:

Objective

To investigate the effect and mechanism of microRNA-515-5p (miR-515-5p) on the cisplatin sensitivity of non-small cell lung cancer (NSCLC).

Methods

The expression of miR-515-5p in BEAS-2B, A549 and A549/DDP cells was detected by real-time fluorescent quantitative PCR (RT-qPCR). A549/DDP cells were divided into NC group, miR-515-5p group, si-RING1 group and miR-515-5p inh+ si-RING1 group. CCK-8 assay was used to assess the proliferation of A549/DDP cells. WB was performed to measure the expression of RING1 and apoptosis related proteins. Dual luciferase reporter gene system was used to verify the targeting relationship between miR-515-5p and RING1.

Results

The expression of miR-515-5p in BEAS-2B, A549 and A549/DDP cells were (1.00±0.03), (0.61±0.03), (0.31±0.04), respectively. A549/DDP cells were transfected with miR-515-5p mimics, the OD450 values of cells in NC group and miR-515-5p group at 24, 48, 72 and 96 h were (0.61±0.02), (0.52±0.02), (0.84±0.02), (0.68±0.04), (1.03±0.03), (0.79±0.04), (1.08±0.03), (0.86±0.04), respectively. The differences of those items were all statistically significant (all P<0.05). The expression of cleaved caspase-3, cleaved PARP and Bax in miR-515-5p group were significantly higher than those in NC group, and the expression of Bcl-2 were significantly lower than those in NC group. A549/DDP cells were transfected with si-RING1 and miR-515-5p inhibitor, the OD450 values of cells in NC group, si-RING1 group and miR-515-5p inh+ si-RING1 group at 24, 48, 72 and 96 h were (0.63±0.02), (0.49±0.04), (0.58±0.03), (0.83±0.03), (0.62±0.05), (0.80±0.02), (1.05±0.04), (0.76±0.03), (1.02±0.04), (1.15±0.05), (0.86±0.03), (1.12±0.06), respectively. The differences of those items were all statistically significant (all P<0.05). The expression of cleaved caspase-3, cleaved PARP and Bax in si-RING1 group were significantly higher than those in NC group and miR-515-5p inh+ siRING1 group, and the expression of Bcl-2 were significantly lower than those in NC group and miR-515-5p inh+ siRING1 group.

Conclusion

miR-515-5p enhanced the cisplatin sensitivity of A549/DDP cells through targeting downregulate the expression of RING1.

Key words: MicroRNA-515-5p, Ring finger protein 1, Non-small cell lung cancer, Cisplatin sensitivity

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