LncRNA PVT1 promotes malignant progression by regulating the miR-7-5p/CDKL1 axis in oral squamous cell carcinoma.

Oral squamous cell carcinoma (OSCC), one of the most common types of head and neck squamous cell carcinoma (HNSCC), is characterized by high incidence and mortality. PVT1 is a long non-coding RNA (lncRNA) that plays an oncogenic role in various cancer types. This study aims to reveal the role and underlying molecular mechanism of PVT1 in OSCC progression. The expression levels of PVT1, miR-7-5p, and CDKL1 mRNA were evaluated using qRT-PCR. Western blot and IHC analysis were conducted to determine the protein expression of CDKL1. The biological functions of PVT1, miR-7-5p, and CDKL1 in OSCC were investigated through CCK-8, transwell migration and invasion assays. In vivo experiments utilized a xenograft model to examine the impact of PVT1 on OSCC. Furthermore, the interaction among PVT1, miR-7-5p, and CDKL1 was explored using RNA pull down assay and luciferase reporter assays. We found that PVT1 enhanced cell proliferation, migration, and invasion by targeting CDKL1. In addition, PVT1 functions as a sponge to modulate miR-7-5p, thereby influencing the expression of CDKL1 and the progression of OSCC. In conclusion, this study illustrates that the "PVT1/miR-7-5p/CDKL1" pathway is capable of promoting the progression of OSCC and may serve as a promising target for developing treatment strategies for OSCC.