Germ cell-specific gene 2 accelerates cell cycle in epithelial ovarian cancer by inhibiting GSK3α-p27 cascade

Area of Science:

• Oncology
• Molecular Biology
• Cell Cycle Regulation

Background:

• Epithelial ovarian cancer (EOC) presents a significant challenge due to its aggressive nature and poor prognosis.
• The precise molecular mechanisms governing EOC progression remain incompletely understood.
• Germ cell-specific gene 2 (GSG2) has been identified as highly expressed and crucial for EOC growth.

Purpose of the Study:

• To elucidate the role of GSG2 in the molecular pathogenesis of epithelial ovarian cancer.
• To investigate the downstream signaling pathways regulated by GSG2 in EOC cells.
• To evaluate GSG2 as a potential therapeutic target for EOC.

Main Methods:

• Lentivirus-mediated transfection was used to establish GSG2-knockdown and GSG2-overexpressing human ovarian cancer cell lines (HO8910 and SKOV3).
• Cell proliferation assays and cell cycle analysis (G2/M phase arrest) were performed.
• Phosphorylation-protein arrays were utilized to identify key signaling molecules, followed by specific inhibition of GSK3α activity.

Main Results:

• GSG2 knockdown significantly inhibited EOC cell proliferation and induced G2/M phase arrest.
• GSG2 knockdown led to a marked increase in the expression of p27, a cell cycle inhibitor.
• GSG2 knockdown decreased the phosphorylation of GSK3α at Ser21; inhibiting GSK3α rescued the effects of GSG2 knockdown on cell cycle and p27 expression.

Conclusions:

• GSG2 promotes EOC cell cycle progression and proliferation by phosphorylating GSK3α at Ser21, subsequently reducing p27 expression.
• Targeting GSG2 presents a promising therapeutic strategy for epithelial ovarian cancer.
• The GSG2-GSK3α-p27 signaling axis is a critical pathway in EOC development.