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Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene
Published on: December 31, 2014
FOXD2-AS1 Binding to MYC Activates EGLN3 to Affect the Malignant Progression of Clear Cell Renal Cell Carcinoma
Zhigang Huang1, Bin Liu2, Xiaoju Li1
1Urology Department, The First Affiliated Hospital of Yangtze University, Jingzhou, Hubei, China.
Abstract:
Long noncoding RNA (lncRNA) FOXD2 adjacent opposite strand RNA 1 (FOXD2-AS1) show high expression in various cancers with elusive regulatory mechanisms. This study investigated the regulatory mechanism of FOXD2-AS1 in clear cell renal cell carcinoma (ccRCC) and its influence on ccRCC cell functions, providing novel insights into ccRCC treatment and a theoretical basis for refining prognoses of ccRCC patients. Through differential analysis and survival analysis, differentially expressed lncRNAs (DElncRNAs) that were significantly linked with the prognosis of ccRCC were initially identified, and lncRNA-transcription factor-mRNA triplet was predicted via lncMAP database. RNA immunoprecipitation, chromatin immunoprecipitation, and dual-luciferase reporter assays were applied to verify the targeted relationship between MYC, FOXD2-AS1, and Egl-9 family hypoxia-inducible factor 3 (EGLN3). Cell functions in ccRCC were detected by a set of cell functional assays. Mice experiment was utilized for in vivo validation. We uncovered the elevated FOXD2-AS1 and EGLN3 expression in ccRCC, as well as the promotion effect of FOXD2-AS1 on ccRCC cells to proliferate, migrate, and invade via upregulating EGLN3 expression. Our results also suggested that the regulatory influence of FOXD2-AS1 on EGLN3 was achieved by recruiting MYC to the EGLN3 promoter region. In vitro and in vivo assays both confirmed that the FOXD2-AS1/MYC/EGLN3 axis could accelerate the progression of ccRCC. FOXD2-AS1 activated EGLN3 to accelerate ccRCC cell functions via binding to the transcription factor MYC.
Insights
Long noncoding RNA FOXD2-AS1 promotes clear cell renal cell carcinoma (ccRCC) progression by upregulating EGLN3 expression through MYC recruitment. This FOXD2-AS1/MYC/EGLN3 axis accelerates ccRCC cell proliferation, migration, and invasion.
Area of Science:
- Oncology
- Molecular Biology
- Epigenetics
Background:
- Long noncoding RNAs (lncRNAs) play crucial roles in cancer, but their regulatory mechanisms remain unclear.
- FOXD2 adjacent opposite strand RNA 1 (FOXD2-AS1) is highly expressed in various cancers, including clear cell renal cell carcinoma (ccRCC).
Purpose of the Study:
- To investigate the regulatory mechanism of FOXD2-AS1 in ccRCC.
- To elucidate the influence of FOXD2-AS1 on ccRCC cell functions.
- To provide insights into ccRCC treatment and prognosis.
Main Methods:
- Differential expression and survival analyses to identify prognostic lncRNAs.
- lncRNA-transcription factor-mRNA triplet prediction using lncMAP.
- RNA immunoprecipitation, chromatin immunoprecipitation, and dual-luciferase reporter assays to verify molecular interactions.
- In vitro cell function assays and in vivo mouse experiments for validation.
Main Results:
- FOXD2-AS1 and Egl-9 family hypoxia-inducible factor 3 (EGLN3) expression are elevated in ccRCC.
- FOXD2-AS1 promotes ccRCC cell proliferation, migration, and invasion by upregulating EGLN3.
- FOXD2-AS1 recruits MYC to the EGLN3 promoter region, mediating its regulatory effect.
- The FOXD2-AS1/MYC/EGLN3 axis accelerates ccRCC progression in vitro and in vivo.
Conclusions:
- FOXD2-AS1 acts as a key oncogenic lncRNA in ccRCC.
- The FOXD2-AS1/MYC/EGLN3 signaling pathway is a potential therapeutic target for ccRCC.
- Understanding this axis offers a theoretical basis for refining ccRCC prognoses.
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