SDHB Suppresses the Tumorigenesis and Development of ccRCC by Inhibiting Glycolysis

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Metabolic reprogramming is a hallmark of clear cell renal cell carcinoma (ccRCC).
• Succinate dehydrogenase subunit B (SDHB), a component of mitochondrial complex II, is implicated in kidney cancer's metabolic alterations.
• The specific role and mechanisms of SDHB in ccRCC remain largely undefined.

Purpose of the Study:

• To investigate the expression, prognostic value, and molecular mechanisms of SDHB in clear cell renal cell carcinoma.
• To determine if SDHB functions as a tumor suppressor in ccRCC.

Main Methods:

• Bioinformatic analyses utilizing GEO, TCGA, and Oncomine databases.
• Immunohistochemistry on ccRCC tissues.
• Analysis of gene methylation and protein-protein interaction networks.
• In vitro experiments assessing cell proliferation, colony formation, and migration upon SDHB overexpression.

Main Results:

• SDHB expression was significantly downregulated in ccRCC tissues, decreasing with advanced stage and grade.
• Low SDHB levels correlated with poor patient prognosis, particularly in advanced ccRCC.
• Increased promoter methylation of the SDHB gene contributed to its reduced expression.
• SDHB interacted with metabolism-related genes and its overexpression inhibited ccRCC cell proliferation, colony formation, and migration by suppressing aerobic glycolysis.

Conclusions:

• SDHB functions as a tumor suppressor in ccRCC, with its downregulation driven by promoter hypermethylation.
• SDHB is a potential prognostic biomarker and therapeutic target for clear cell renal cell carcinoma.