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miR-124 Functions As A Melanoma Tumor Suppressor By Targeting RACK1

Authors Shen C, Hua H, Gu L, Cao S, Cai H, Yao X, Chen X

Received 28 July 2019

Accepted for publication 31 October 2019

Published 19 November 2019 Volume 2019:12 Pages 9975—9986


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Prof. Dr. Takuya Aoki

Congcong Shen,1 Hui Hua,2 Lixiong Gu,1 Shuanglin Cao,1 Hengji Cai,1 Xiaodong Yao,1 Xiaodong Chen1

1Department of Dermatology, Affiliated Hospital of Nantong University, Nantong 226001, People’s Republic of China; 2Department of Dermatology, The Third People’s Hospital of Nantong, Nantong 226001, People’s Republic of China

Correspondence: Xiaodong Chen
Department of Dermatology, Affiliated Hospital of Nantong University, Nantong 226001, People’s Republic of China
Tel +86 513 8505 2243

Background: miRNAs are small noncoding RNAs that function as posttranscriptional regulators during development and disease. Aberrant expression of miRNAs has been associated with various types of malignant tumors. Decreased levels of miR-124 have been observed in human cancers. RACK1 is a scaffold protein that acts as an oncogene in various human cancers. The association between miR-124 and RACK1 in melanoma has not been characterized.
Materials and methods: Real-time quantitative PCR was used to analyze RACK1 and miR-124 expression in melanoma tissue and cell lines. Dual-Luciferase reporter assay was performed to evaluate the effect of miR-124 inhibition on RACK1 expression. The effects of miR-124 on RACK1 in melanoma cell lines were evaluated using Western blot analysis and immunocytochemical staining. Wound-healing, transwell, and MTT assays, and annexin V-fluorescein isothiocyanate/propidium iodide followed by flow cytometry were used to evaluate the effects of miR-124 on RACK1-mediated proliferation, migration, invasion, and apoptosis of melanoma cells.
Results: The expression of miR-124 in melanoma tissue was lower than that in normal skin tissue, and the expression of RACK1 was higher in melanoma tissue than that in normal skin tissue. Analysis using Dual-Luciferase reporter assay showed that RACK1 was a direct target of miR-124. Western blot and immunocytochemical staining showed that the expression of RACK1 was significantly inhibited by miR-124 in both A375 and A875 melanoma cells. Furthermore, the results of functional experiments showed that degradation of RACK1 by miR-124 inhibited proliferation, migration, and invasion of melanoma cells, and promoted melanoma cell apoptosis.
Conclusion: The results suggested that miR-124 affected melanoma cells by directly targeting RACK1. miR-124 and RACK1 may be biomarkers for clinical diagnosis, and prognostic factors of human melanoma. Furthermore, miR-124 and RACK1 may be targets for the treatment of melanoma.

Keywords: melanoma, miR-124, RACK1, proliferation, migration, invasion, apoptosis

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