LncRNA OIP5-AS1 promotes the development of esophageal squamous cell carcinoma by binding to miR-1297

Long non-coding RNA OIP5-AS1 promotes the progression of esophageal cancer by regulating miR-30a/VOPP1 expression

Long non-coding RNAs (lncRNAs) serve an important role in the development of esophageal cancer (EC), which is the eighth most common type of cancer worldwide. lncRNA opa-interacting protein 5 antisense transcript 1 (OIP5-AS1) is associated with human malignancy. However, the biological roles of OIP5-AS1 in the development of EC remain unclear. In the present study, transfection was conducted, and reverse transcription-quantitative PCR and western blot analysis were used for the detection of mRNA and protein expression, respectively. Furthermore, dual-luciferase reporter and RNA immunoprecipitation assays were used to study the interaction between miRNA and lncRNA or genes. The results revealed that OIP5-AS1 expression in EC tissues and cultured EC cells was upregulated, microRNA-30a (miR-30a) expression was downregulated. OIP5-AS1-knockdown suppressed the proliferation, migration and invasion of EC9706 and EC109 cells. miR-30a was confirmed to interact with OIP5-AS1, and miR-30a-mimics transfection ameliorated the effects of OIP5-AS1 in EC cells. Vesicular overexpressed in cancer prosurvival protein 1 (VOPP1) was verified as the direct target of miR-30a. VOPP1 expression was positively correlated with OIP5-AS1 expression in EC cells. Overexpression of VOPP1 ameliorated the negative effects of OIP5-AS1-knockdown on EC9706 and EC109 cells. In conclusion, OIP5-AS1 promoted the proliferation, migration and invasion of EC cells by increasing VOPP1 expression by sponging miR-30a.

Downregulation of lncRNA-HEIH curbs esophageal squamous cell carcinoma progression by modulating miR-4458/PBX3

Background

Long non‐coding RNAs (lncRNAs) have been found to play a specific part in the development of esophageal squamous cell carcinoma (ESCC), except for lncRNA HEIH. Here, we aimed to discover the molecular mechanisms of HEIH in ESCC.

Methods

We detected the expression level of HEIH and miR‐4458 in ESCC tissues and cells using qRT‐PCR assay. A dual luciferase reporter assay was used to check the relationship between HEIH, miR‐4458 or PBX3. Counting Clock Kit‐8 (CCK‐8) assay and transwell assay were used to detect ESCC cell proliferation and invasion capability. Western blot analysis was used to measure the protein expression level of PBX3.

Results

HEIH was confirmed to be upregulated in both ESCC tissues and cell lines. Inversely, there was a downregulation of miR‐4458 in ESCC tissues and cell lines. Functionally, we noticed that depletion of HEIH restrained ESCC cell viability, and invasion capability. Moreover, PBX silencing was found to restrain ESCC cell progression, while miR‐4458 or HEIH vector both could alleviate its suppressive effect.

Conclusions

The present study clarified that HEIH regulated ESCC progression by suppressing miR‐4458 and upregulating PBX3. Our findings suggested that HEIH could be a possible therapeutic target for ESCC treatment.