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Modeling Spontaneous Metastatic Renal Cell Carcinoma mRCC in Mice Following Nephrectomy
Published on: April 29, 2014
MiR-216a exerts tumor-suppressing functions in renal cell carcinoma by targeting TLR4
Wanhui Wang1, Enyang Zhao1, Yang Yu1
1Department of Urology, The Second Affiliated Hospital of Harbin Medical UniversityHarbin 150086, China.
Abstract:
MiR-216a, a tumor-related microRNA (miRNA), has been reported to be implicated in the tumorigenesis and progression of diverse types of human malignancies; however, its role in renal cell carcinoma (RCC) remains unclear. This study aimed to explore the biological role of miR-216a in RCC and clarify the potential mechanisms involved. In the present study, miR-216a was found to be significantly down-regulated in both RCC tissues and cell lines. Functional studies demonstrated that enhanced expression of miR-216a suppressed RCC cell proliferation, migration and invasion in vitro, inhibited tumor growth in vivo, and induced RCC cell cycle arrest and apoptosis. Moreover, the tumor-suppressing effects of miR-216a in RCC were abrogated by the miR-216a inhibitor treatment. Notably, toll-like receptor 4 (TLR4) was downregulated by miR-216a via direct binding to its 3' untranslated region in RCC cells. Furthermore, TLR4 expression was discovered to be markedly up-regulated and inversely correlated with miR-216a expression in RCC tissues. Mechanistic studies revealed that restoring the expression of TLR-4 alleviated miR-216a-induced inhibitory effects on proliferation, migration and invasion of RCC cells. Taken together, these findings suggest that miR-216a functions as a tumor suppressor in RCC by directly targeting TLR4 and that miR-216a might be a novel therapeutic target for RCC.
Insights
MicroRNA-216a (miR-216a) acts as a tumor suppressor in renal cell carcinoma (RCC). It inhibits cancer progression by targeting toll-like receptor 4 (TLR4), suggesting miR-216a as a potential therapeutic target for RCC.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) play critical roles in cancer development.
- The function of miR-216a in renal cell carcinoma (RCC) is not well understood.
- Tumorigenesis involves complex regulatory pathways influenced by miRNAs.
Purpose of the Study:
- To investigate the biological role of miR-216a in RCC.
- To elucidate the underlying molecular mechanisms of miR-216a in RCC.
- To explore miR-216a as a potential therapeutic target for RCC.
Main Methods:
- Quantitative real-time PCR to assess miR-216a and TLR4 expression in RCC tissues and cell lines.
- In vitro functional assays (cell proliferation, migration, invasion, cell cycle, apoptosis) to evaluate miR-216a's effects.
- In vivo tumor growth assays.
- Luciferase reporter assays to confirm direct binding of miR-216a to TLR4 3' UTR.
- Western blotting and rescue experiments to validate the miR-216a/TLR4 pathway.
Main Results:
- MiR-216a was significantly downregulated in RCC tissues and cell lines.
- Overexpression of miR-216a suppressed RCC cell proliferation, migration, invasion, and tumor growth, while inducing cell cycle arrest and apoptosis.
- MiR-216a directly targeted toll-like receptor 4 (TLR4) by binding to its 3' UTR.
- TLR4 was upregulated in RCC and inversely correlated with miR-216a expression.
- Restoring TLR4 expression abrogated the tumor-suppressive effects of miR-216a.
Conclusions:
- MiR-216a functions as a tumor suppressor in RCC.
- MiR-216a exerts its tumor-suppressive effects by directly targeting and downregulating TLR4.
- MiR-216a represents a potential novel therapeutic target for renal cell carcinoma.
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