RIOK2 Contributes to Cell Growth and Protein Synthesis in Human Oral Squamous Cell Carcinoma

Area of Science:

• Molecular Biology
• Oncology
• Biochemistry

Background:

• Ribosomes are crucial for protein synthesis, essential for both cellular homeostasis and rapid cancer cell division.
• The specific role of ribosome biogenesis mediators in tongue squamous cell carcinoma (TSCC) malignancy remains largely unexplored.

Purpose of the Study:

• To investigate the role of RIO kinase 2 (RIOK2), a key enzyme in pre-40S ribosomal complex maturation, in the malignant behavior of TSCC.
• To evaluate RIOK2 as a potential prognostic marker and therapeutic target for TSCC.

Main Methods:

• Analysis of RIOK2 expression in relation to patient survival data for TSCC.
• Multivariate analysis to determine RIOK2's independent prognostic value.
• Inhibition of RIOK2 expression using small interfering RNA (siRNA) in oral squamous cell carcinoma cell lines.
• Assessment of cell growth, S6 ribosomal protein expression, and overall protein synthesis following RIOK2 knockdown.

Main Results:

• Elevated RIOK2 expression significantly correlates with poorer overall survival in TSCC patients.
• RIOK2 was identified as an independent prognostic factor for TSCC (hazard ratio = 3.53).
• RIOK2 inhibition via siRNA reduced cancer cell proliferation and decreased S6 ribosomal protein levels and overall protein synthesis in oral squamous cell carcinoma cells.

Conclusions:

• RIOK2 plays a significant role in the malignant progression of TSCC.
• RIOK2 is a validated independent prognostic marker for TSCC.
• Targeting RIOK2 presents a promising therapeutic strategy for TSCC treatment.