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microRNA-338-3p functions as a tumor suppressor in human non‑small‑cell lung carcinoma and targets Ras-related protein 14.
Molecular Medicine Reports 2015 Februrary
microRNAs (miRNAs) have been demonstrated to be important gene regulators with critical roles in diverse biological processes, including tumorigenesis. Accumulating evidence suggests that miR‑338-3p exerts a tumor suppressor role and is downregulated in tumors, including gastric cancer and colorectal carcinoma. However, the role of miR‑338-3p in lung cancer, particularly non‑small‑cell lung carcinoma (NSCLC), has remained elusive. In the present study, the expression levels of miR‑338-3p in NSCLC tissues were compared with those of matched normal tissues by use of polymerase chain reaction analysis. miR-338-3p was shown to be downregulated in NSCLC tissues, and the expression levels of miR‑338‑3p were significantly correlated with NSCLC cancer differentiation, pathological stage and lymph‑node metastasis. Ectopic miR-338-3p expression significantly suppressed the in vitro proliferation and colony formation of NSCLC cells and enhanced apoptosis. Of note, ectopic miR‑338-3p expression significantly inhibited Ras‑related protein 14 (RAB14) mRNA and protein expression, and reduced luciferase reporter activity containing the RAB14 3'-untranslated region through the first binding site. These findings suggested that miR‑338-3p regulated the survival of NSCLC cells partially through the downregulation of RAB14. Therefore, targeting the miR‑338-3p/RAB14 interaction may serve as a novel therapeutic application to treat NSCLC patients.
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