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miR-519d-3p inhibits gastric cancer progression by targeting the Beclin-1-dependent autophagy pathway.

Yuanbin Shi·Mengfu Guo·Haokun Liu·Chen Ye·Yiwei Mo·Wei Chen·Linhai Zheng
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Abstract

Dysregulation of microRNA networks is a hallmark of gastric cancer pathogenesis, but the mechanisms driving early-stage disease remain poorly understood. This study utilized integrative bioinformatics analysis of the Gene Expression Omnibus dataset GSE158315 to identify tumor-suppressive microRNAs in early gastric cancer. We identified hsa-miR-519d-3p as a core downregulated microRNA in early-stage tissues. Functional assays in NUGC-3 and MKN-45 cell lines demonstrated that miR-519d-3p overexpression significantly suppressed cell migration and invasion, whereas its inhibition enhanced these malignant phenotypes. Dual-luciferase reporter assays confirmed that miR-519d-3p directly targets the 3' untranslated region of BECN1 (Beclin-1). Silencing Beclin-1 via siRNA mimicked the effects of miR-519d-3p overexpression, while rescue experiments showed that Beclin-1 knockdown reversed the pro-migratory and pro-invasive effects triggered by miR-519d-3p inhibition. Furthermore, monitoring of autophagic flux using mRFP-GFP-LC3 tandem reporters revealed that miR-519d-3p inhibition enhances autophagy in a Beclin-1-dependent manner. Clinical data analysis from The Cancer Genome Atlas further supported the upregulation of Beclin-1 in gastric cancer and its correlation with aggressive clinicopathological features. In conclusion, our findings establish the miR-519d-3p/Beclin-1 axis as a critical regulator of motility and autophagy in gastric cancer, representing a potential therapeutic target for early intervention.

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Yuanbin Shi, Mengfu Guo, Haokun Liu, Chen Ye, Yiwei Mo, Wei Chen, Linhai Zheng. 2026-09-06. miR-519d-3p inhibits gastric cancer progression by targeting the Beclin-1-dependent autophagy pathway.. https://doi.org/10.1016/j.gene.2026.150391

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