Triptolide inhibits epithelial ovarian tumor growth by blocking the hedgehog/Gli pathway

Area of Science:

• Oncology
• Molecular Biology
• Pharmacology

Background:

• Epithelial ovarian cancer (EOC) is aggressive with poor prognosis.
• The hedgehog (Hh)/Gli signaling pathway is implicated in EOC progression.
• Triptolide (TPL), a compound from Chinese herbs, shows potential in cancer treatment.

Purpose of the Study:

• To investigate the mechanism by which TPL affects Hh/Gli pathway activity in EOC.
• To determine the impact of TPL on EOC biological behaviors and tumor growth.

Main Methods:

• Utilized a Gli-dependent luciferase reporter assay to screen natural compounds.
• Assessed TPL's effect on EOC cell proliferation, migration, and invasion.
• Investigated TPL's impact on Gli1 and Gli2 degradation and ubiquitination.
• Performed in vivo studies to evaluate TPL's efficacy in inhibiting EOC tumor growth.

Main Results:

• TPL significantly reversed Smo agonist SAG-induced EOC cell proliferation, migration, and invasion in a dose-dependent manner.
• TPL promotes the degradation of Gli1 and Gli2 via ubiquitination, thereby inhibiting Hh/Gli pathway activity.
• In vivo studies confirmed TPL's significant inhibition of EOC tumor growth.

Conclusions:

• TPL effectively inhibits EOC progression by targeting the Hh/Gli signaling pathway.
• TPL's mechanism involves promoting Gli1 and Gli2 degradation through ubiquitination.
• TPL demonstrates significant antitumor activity against EOC both in vitro and in vivo.