LncRNA MIR100HG affects the proliferation and metastasis of lung cancer cells through mediating the microRNA‐5590‐3p/DCBLD2 axis.

Objective: The aim of this paper is to investigate the effect of long noncoding RNA (lncRNA) MIR100HG on the proliferation and metastasis of lung cancer cells by mediating the microRNA (miR)−5590‐3p/DCBLD2 axis. Methods: RNA levels of MIR100HG, miR‐5590‐3p, and DCBLD2 in lung cancer tissues and cells were detected by quantitative reverse‐transcription polymerase chain reaction, and protein level was assessed by Western blot. Effects of MIR100HG or miR‐5590‐3p on proliferation, migration, and invasion of lung cancer cells were detected by Cell Counting Kit‐8, colony formation, and Transwell assays. Luciferase reporter assay and RNA‐immunoprecipitation assay confirmed the target relationship between miR‐5590‐3p and MIR100HG or DCBLD2. Results: MIR100HG and DCBLD2 were highly expressed, while miR‐5590‐3p was lowly expressed in lung cancer tissues and cells. Silencing MIR100HG or upregulating miR‐5590‐3p impeded lung cancer cell proliferation, migration, and invasion. MIR100HG could up‐regulate DCBLD2 by sponging miR‐5590‐3p. Downregulation of miR‐5590‐3p partly overturned the suppressive effect of silencing MIR100HG on lung cancer cell proliferation and metastasis, and overexpression of DCBLD2 also reversed the effect of overexpression of miR‐5590‐3p on lung cancer cell proliferation and metastasis. Conclusion: LncRNA MIR100HG promotes lung cancer progression by targeting and negatively regulating DCBLD2 through binding with miR‐5590‐3p. [ABSTRACT FROM AUTHOR]