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Development and Validation of a Comprehensive Analysis of the Competing Endogenous CircRNA/miRNA/mRNA Network for Identification of Immune-Related Therapeutic Targets in Esophageal Squamous Cell Carcinoma

ABSTRACT: Esophageal squamous cell carcinoma (ESCC) immunotherapy exhibits limited efficacy, prompting the investigation of its molecular mechanisms. Circular RNAs (circRNAs) are believed to play a significant role in the development of the tumor microenvironment (TME) in ESCC, but their role in ceRNA regulation remains indeterminate. In this study, we identified the expression of mRNA, circRNA in four tumor samples and their pair normal samples noting their paired samples by high-throughput sequencing to validate the correlation analysis.

ORGANISM(S): Homo sapiens

PROVIDER: GSE226192 | GEO | 2023/09/03

REPOSITORIES: GEO

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Project description:Background: Esophageal squamous cell carcinoma (ESCC) is a common invasive malignancy worldwide with poor clinical outcomes. Increasing amount of long non-coding RNAs (lncRNAs) have been reported to be involved in cancer development. However, lncRNAs that are functional in ESCC and the underlying molecular mechanisms remain largely unknown. Methods: Transcriptomic analysis was performed to identify dysregulated lncRNAs in ESCC tissue samples. The high expression of LINC00680 in ESCC was validated by RT-qPCR, and the oncogenic functions of LINC00680 was investigated by cell proliferation, colony formation, migration and invasion assays in ESCC cells in vitro and xenografts derived from ESCC cells in mice. RNA-seq, competitive endogenous RNA (ceRNA) network analysis, and luciferase reporter assays were carried out to identify LINC00680 target genes and the microRNAs (miRNAs) bound to LINC00680. Antisense oligonucleotides (ASOs) were used for in vivo treatment. Results: Transcriptome profiling revealed that a large number of lncRNAs was dysregulated in ESCC tissues. Notably, LINC00680 was highly expressed, and upregulation of LINC00680 was associated with large tumor size, advanced tumor stage, and poor prognosis. Functionally, knockdown of LINC00680 restrained ESCC cell proliferation, colony formation, migration, and invasion in vitro and inhibited tumor growth in vivo. Mechanistically, LINC00680 was found to act as a ceRNA by sponging miR-423-5p to regulate PAK6 (p21-activated kinase 6) expression in ESCC cells. The cell viability and motility inhibition induced by LINC00680 knockdown was significantly reversed upon PAK6 restoration and miR-423-5p inhibition. Furthermore, ASO targeting LINC00680 substantially suppressed ESCC both in vitro and in vivo. Conclusions: An oncogenic lncRNA, LINC00680, was identified in ESCC, which functions as a ceRNA by sponging miR-423-5p to promote PAK6 expression and ESCC. LINC00680/miR-423-5p/PAK6 axis may serve as promising diagnostic and prognostic biomarkers and therapeutic targets for ESCC.

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Development and Validation of a Comprehensive Analysis of the Competing Endogenous CircRNA/miRNA/mRNA Network for Identification of Immune-Related Therapeutic Targets in Esophageal Squamous Cell Carcinoma

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