MicroRNA‑320a is downregulated in non‑small cell lung cancer and suppresses tumor cell growth and invasion by directly targeting insulin‑like growth factor 1 receptor

Wang,Jianguo; Shi,Chunyun; Wang,Jianfei; Cao,Li; Zhong,Li; Wang,Dongmei

doi:10.3892/ol.2017.5863

May-2017 Volume 13 Issue 5

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May-2017 Volume 13 Issue 5

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Article

MicroRNA‑320a is downregulated in non‑small cell lung cancer and suppresses tumor cell growth and invasion by directly targeting insulin‑like growth factor 1 receptor

Authors:
- Jianguo Wang
- Chunyun Shi
- Jianfei Wang
- Li Cao
- Li Zhong
- Dongmei Wang
View Affiliations / Copyright

Affiliations: College of Life Sciences, Agricultural University of Hebei, Baoding, Hebei 071001, P.R. China, Department of Pediatrics, Baoding Children's Hospital, Baoding, Hebei 071000, P.R. China, College of Life Sciences, Hebei University, Baoding, Hebei 071000, P.R. China
Pages: 3247-3252
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Published online on: March 14, 2017

https://doi.org/10.3892/ol.2017.5863
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Abstract

Accumulating evidence has demonstrated that microRNAs (miRs/miRNAs) are implicated in carcinogenesis and cancer progression, and can function as oncogenes or tumor suppressor genes in human cancer types. Previous profile studies of miRNA expression levels have revealed that miR‑320a was downregulated in breast cancer, colon cancer, bladder cancer, glioblastoma and salivary adenoid cystic carcinoma. However, its expression level, potential functions and the mechanisms underlying its functions in non‑small cell lung cancer (NSCLC) require further investigation. The present study investigated the expression level, biological roles and underlying molecular mechanisms of miR‑320a in NSCLC. The expression levels of miR‑320a in NSCLC tissue and cell lines were detected using the reverse transcription‑quantitative polymerase chain reaction. Cell proliferation and Transwell invasion assays were performed to examine the effects of miR‑320a on NSCLC cells. In addition, bioinformatic analysis, western blot analysis and luciferase reporter assays were performed to identify the direct gene target of miR‑320a in NSCLC. In the present study it was demonstrated that miR‑320a was significantly downregulated in NSCLC tissues and cell lines. Ectopic overexpression of miR‑320a suppressed the proliferation and invasion of NSCLC cells. Further studies indicated that miR‑320a directly targeted the 3'‑untranslated region of insulin‑like growth factor 1 receptor (IGF‑1R) and suppressed its expression at the mRNA and protein levels. As well as restoring the miR‑320a expression level, the knockdown of IGF‑1R also decreased the growth and invasion of the NSCLC cells. These results suggested that miR‑320a served as a tumor suppressor in the NSCLC cells by directly targeting IGF‑1R. Therefore, miR‑320a should be investigated as a therapeutic target for the treatment of NSCLC.

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Journals

International Journal of Molecular Medicine

International Journal of Oncology

Molecular Medicine Reports

Oncology Reports

Experimental and Therapeutic Medicine

Oncology Letters

Biomedical Reports

Molecular and Clinical Oncology

World Academy of Sciences Journal

International Journal of Functional Nutrition

International Journal of Epigenetics

Medicine International

MicroRNA‑320a is downregulated in non‑small cell lung cancer and suppresses tumor cell growth and invasion by directly targeting insulin‑like growth factor 1 receptor

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