Background: Circular RNAs (circRNAs) play critical roles in various types of cancer and chemosensitivity.
Methods: The expression levels of circ_0004507 and microRNA-873 (miR-873) were measured by quantitative real-time polymerase chain reaction (qRT-PCR). The interaction between circ_0004507 and miR-873 was predicted by circinteractome and verified by dual-luciferase reporter assay and RNA pull-down assay. Xenograft tumor model was established to confirm the biological role of circ_0004507 in vivo.
Results: circ_0004507 was highly expressed and miR-873 was lowly expressed in laryngeal cancer tissues. circ_0004507 knockdown or miR-873 overexpression inhibited cell proliferation, migration and invasion, and increased apoptosis and cisplatin sensitivity in laryngeal cancer cells. miR-873 was identified as a direct target of circ_0004507. circ_0004507 interference inhibited tumor growth and promoted cisplatin sensitivity by upregulating miR-873 in vivo.
Conclusion: Knockdown of circ_0004507 inhibited laryngeal cancer progression and cisplatin resistance by sponging miR-873, providing a potential target for laryngeal cancer therapy.
Keywords: cancer progression; circ_0004507; cisplatin; laryngeal cancer; miR-873.
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