Small nucleolar RNA 113-1 suppresses tumorigenesis in hepatocellular carcinoma

Area of Science:

• Oncology
• Molecular Biology
• Epigenetics

Background:

• Small nucleolar RNAs (snoRNAs) are increasingly implicated in cancer development.
• The specific role of small nucleolar RNA 113-1 (SNORD113-1) in hepatocellular carcinoma (HCC) pathogenesis was previously uncharacterized.

Purpose of the Study:

• To investigate the expression patterns of SNORD113-1 in HCC.
• To elucidate the functional role of SNORD113-1 in HCC tumorigenesis.
• To explore the potential of SNORD113-1 as a diagnostic or therapeutic target for HCC.

Main Methods:

• Quantitative RT-PCR was used to measure SNORD113-1 expression in 112 HCC tissues and paired non-tumor tissues.
• In vitro (HepG2, Huh7 cells) and in vivo (xenograft nude mouse model) experiments assessed the impact of SNORD113-1 on HCC progression.
• Sodium bisulfite sequencing identified CpG methylation in the SNORD113-1 promoter region.
• Cancer pathway reporters were utilized to investigate the underlying molecular mechanisms.

Main Results:

• SNORD113-1 expression was significantly reduced in HCC tumors compared to adjacent non-tumor tissues.
• Lower SNORD113-1 levels correlated with poorer patient survival.
• Increased CpG methylation was observed in the SNORD113-1 promoter in HCC tissues.
• SNORD113-1 demonstrated tumor-suppressive effects by inhibiting cancer cell proliferation in vitro and in vivo.
• SNORD113-1 inactivated ERK1/2 and SMAD2/3 phosphorylation, impacting MAPK/ERK and TGF-β signaling pathways.

Conclusions:

• SNORD113-1 acts as a tumor suppressor in hepatocellular carcinoma.
• SNORD113-1 warrants further investigation as a potential biomarker for HCC diagnosis and a therapeutic target for HCC treatment.