MicroRNA 519d (miR-519d)

MicroRNA 519d (miR-519d) is a small, noncoding RNA molecule of approximately 19-23 nucleotides, belonging to the C19MC miRNA cluster on chromosome 19. MiR-519d functions as a post-transcriptional regulator by binding to complementary sequences on target mRNAs, leading primarily to mRNA degradation or translational inhibition. It plays various roles in cellular physiology and pathophysiology, particularly in cancer, where it can act either as a tumor suppressor or an oncogene depending on cancer type and molecular context. For example, miR-519d suppresses cell migration and invasion in oral squamous cell carcinoma (OSCC) by targeting matrix metalloproteinase-3 (MMP3) and regulates epithelial-mesenchymal transition (EMT). In ovarian cancer, miR-519d represses cell proliferation and enhances sensitivity to the chemotherapeutic agent cisplatin by targeting XIAP. The dysregulation of miR-519d is frequently linked to epigenetic mechanisms, such as DNA methylation changes upstream of its genetic locus, and has clinical implications as a biomarker for diagnosis, prognosis, and therapeutic response in multiple cancers. There are no approved drugs directly targeting miR-519d, but its modulation (by mimics, inhibitors, or epigenetic therapy) is under experimental investigation.

Other names

hsa-mir-519dMIRN519Dmir-519dMIR519D

No direct small-molecule targeting established; exogenous modulation (mimics, inhibitors, or epigenetic modifiers such as demethylating agents)