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Long Non-Coding RNA TTN-AS1 Serves as a Competing Endogenous RNA of miR-195 to Facilitate Clear Cell Renal Cell Carcinoma Progression

Authors Lin K, Chen H, Su C, Zhu H, Lai C, Shi Y

Received 12 February 2020

Accepted for publication 1 April 2020

Published 4 May 2020 Volume 2020:12 Pages 3091—3097


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Yong Teng

Keng Lin,1 Hao Chen,2 Chunyan Su,3 Huanjin Zhu,1 Changchun Lai,4 Yaling Shi5

1Clinical Laboratory, Maternal and Children Health Care Hospital (Huzhong Hospital) of Huadu, Guangzhou 510800, People’s Republic of China; 2Clinical Laboratory, The Affiliated Oncology Hospital of Sun Yat-sen University, Guangzhou 510000, People’s Republic of China; 3Clinical Laboratory, The Second People’s Hospital of Gaozhou, Gaozhou 525200, People’s Republic of China; 4Clinical Laboratory, People’s Hospital of Maoming, Maoming 525000, People’s Republic of China; 5Clinical Laboratory, Guangzhou Eighth People’s Hospital, Guangzhou Medical University, Guangzhou 510000, People’s Republic of China

Correspondence: Yaling Shi
Clinical Laboratory, Guangzhou Eighth People’s Hospital, Guangzhou Medical University, Guangzhou 510060, People’s Republic of China

Introduction: Clear cell renal cell carcinoma (ccRCC) is an aggressive human malignancy. Long non-coding RNAs (lncRNAs) are critical regulators in many malignant tumors, including ccRCC. The aim of this study is to investigate the expression, functions and molecular mechanisms of lncRNA TTN-AS1 in ccRCC.
Methods: A total of  145 paired cancer and normal tissues were collected from patients with ccRCC. The expression levels of TTN-AS1 and miR-195 in the tissues or cells were measured by RT-qPCR analysis. The expression levels of cyclin D1 protein were measured by Western blot analysis. Cell proliferation and cell cycle distribution were detected by MTT assay and flow cytometer analysis, respectively. The binding relationship between miR-195 and TTN-AS1 or cyclin D1 mRNA was validated by dual-luciferase reporter assay.
Results: Our results revealed that TTN-AS1 expression levels in human ccRCC tissues and cell lines were markedly increased. High expression of TTN-AS1 was closely associated with adverse clinicopathological characteristics of ccRCC patients. Gain- and loss-of-function experiments showed that TTN-AS1 overexpression promoted the proliferation and cell cycle transition of ccRCC cells, while the malignant traits were obviously suppressed after TTN-AS1 knockdown. Mechanistically, miR-195 was found to bind with and to be negatively regulated by TTN-AS1 in ccRCC cells. Further, we showed that cyclin D1 is a direct target of miR-195 in ccRCC, and rescue assays verified that restoration of miR-195 expression partially blocked the oncogenic effects of TTN-AS1 in ccRCC cells.
Conclusion: Our study provides a novel mechanism of TTN-AS1/miR-195/cyclin D1 regulatory axis in ccRCC, which may become a breakthrough for ccRCC therapy in the future.

Keywords: clear cell renal cell carcinoma, long non-coding RNA TTN-AS1, miR-195, cell cycle, cyclin D1

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