MicroRNA‑107 may regulate lung cancer cell proliferation and apoptosis by targeting TP53 regulated inhibitor of apoptosis 1

Cai,Peng; Li,Jingjing; Chen,Guiming; Peng,Bing; Yu,Liuyang; Zhao,Bolin; Yu,Yi

doi:10.3892/ol.2020.11248

MicroRNA‑107 may regulate lung cancer cell proliferation and apoptosis by targeting TP53 regulated inhibitor of apoptosis 1

Authors:
- Peng Cai
- Jingjing Li
- Guiming Chen
- Bing Peng
- Liuyang Yu
- Bolin Zhao
- Yi Yu
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Affiliations: Department of Oncology, Jingmen No. 2 People's Hospital, Jingmen, Hubei 448000, P.R. China, Department of Oncology, Wuhan Hankou Hospital, Wuhan, Hubei 430012, P.R. China
Published online on: January 7, 2020 https://doi.org/10.3892/ol.2020.11248
Pages: 1958-1966

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Abstract

Lung cancer causes over 1.6 million mortalities worldwide annually. MicroRNAs (miRs) are involved in various types of cancer‑associated processes. The present study investigated the possible mechanism of miR‑107 in the development of lung cancer in order to identify novel targets for clinical treatment. The expression levels of miR‑107 and its putative target gene TP53 regulated inhibitor of apoptosis 1 (TRIAP1) were measured in lung cancer tumor tissues and non‑tumor adjacent tissues. Subsequently, the association between TRIAP1 and miR‑107 was investigated using a dual‑luciferase reporter assay. Following transfection, the effects of miR‑107 and TRIAP1 on the proliferation and apoptosis of lung cancer cell lines in vitro were investigated using Cell Counting Kit‑8 and flow cytometry assays, respectively. Furthermore, the regulatory effect of miR‑107 on the expression levels of TRIAP1 and associated proteins was analyzed using a western blot assay. The results revealed lower expression levels of miR‑107 and higher expression levels of TRIAP1 in lung cancer tumor tissues compared with non‑tumor adjacent tissues. The dual‑luciferase reporter assay demonstrated that TRIAP1 is a target gene of miR‑107. Additionally, the results revealed that overexpression of miR‑107 resulted in a lower proliferation rate and higher apoptosis rate of A549 cells, compared with the negative control (NC) and control groups (P<0.01). The variation of cell proliferation and apoptosis induced by miR‑107 mimics was reversed by co‑transfection with pcDNA3.1‑TRIAP1. Furthermore, the expression levels of cyclin D1 and proliferating cell nuclear antigen were markedly decreased in the miR‑107 mimics group compared with the NC group (P<0.01). The expression levels of BCL2 associated X apoptosis regulator, tumor protein p53 and caspase 3 were upregulated and the expression levels of TRIAP1 and BCL2 apoptosis regulator were significantly reduced in the miR‑107 mimics group compared with the NC group (P<0.01). The results of the present study suggested that miR‑107 regulates lung cancer cell proliferation and apoptosis by targeting TRIAP1.

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