Long non-coding RNA XIST exerts oncogenic functions in human nasopharyngeal carcinoma by targeting miR-34a-5p

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Long non-coding RNA XIST (XIST) is implicated as an oncogene in various cancers.
• The role of XIST in nasopharyngeal carcinoma (NPC) progression and prognosis remains unclear.

Purpose of the Study:

• To investigate the expression and function of XIST in NPC.
• To elucidate the underlying molecular mechanism of XIST in NPC pathogenesis.

Main Methods:

• Quantitative real-time PCR to assess XIST expression in NPC tissues.
• Kaplan-Meier analysis for survival rates.
• Cell proliferation assays (e.g., MTT, colony formation).
• Western blotting and luciferase reporter assays to confirm molecular interactions.

Main Results:

• XIST expression was significantly upregulated in NPC tissues compared to adjacent non-cancerous tissues.
• Higher XIST expression was associated with advanced clinical stage, metastasis, and poorer patient survival.
• Multivariate analysis identified XIST as an independent prognostic factor for NPC.
• Overexpression of XIST promoted NPC cell proliferation, while its silencing inhibited growth.
• Mechanistically, XIST acts as a molecular sponge for miR-34a-5p, leading to the upregulation of its target gene E2F3.

Conclusions:

• XIST functions as an oncogene in NPC.
• XIST promotes NPC cell growth and progression by upregulating E2F3 via sponging miR-34a-5p.
• XIST may serve as a potential therapeutic target and prognostic biomarker for NPC.