FoxP3-miR-150-5p/3p suppresses ovarian tumorigenesis via an IGF1R/IRS1 pathway feedback loop

Area of Science:

• Oncology
• Molecular Biology
• Gene Regulation

Background:

• Ovarian cancer (OC) is a leading cause of gynecological cancer deaths.
• Deregulation of microRNAs (miRNAs) and the insulin-like growth factor 1 receptor/insulin receptor substrate 1 (IGF1R/IRS1) pathway are implicated in OC progression.

Purpose of the Study:

• To investigate the role and regulatory mechanisms of miR-150 in ovarian cancer.
• To elucidate the molecular functions of miR-150 in OC development and progression.

Main Methods:

• Analysis of miR-150 expression in OC tissues and correlation with patient outcomes.
• In vitro and in vivo experiments to assess the effects of ectopic miR-150 expression on OC cells.
• Luciferase reporter assays and Western blotting to identify direct targets and signaling pathways involved.
• Chromatin immunoprecipitation and promoter analysis to determine upstream regulators.

Main Results:

• miR-150 expression was downregulated in OC tissues and associated with poor patient prognosis.
• Restoring miR-150 expression inhibited OC cell proliferation, migration, and invasion.
• IGF1R and IRS1 were identified as direct targets of miR-150, with the miR-150-IGF1R/IRS1 axis suppressing the PI3K/AKT/mTOR pathway.
• Forkhead box protein 3 (FoxP3) positively regulated miR-150 expression, forming a feedback loop with the PI3K/AKT/mTOR pathway.

Conclusions:

• miR-150 functions as a tumor suppressor miRNA in ovarian cancer.
• A novel feedback loop involving FoxP3, miR-150, IGF1R/IRS1, and the PI3K/AKT/mTOR pathway regulates OC pathogenesis.
• These findings offer potential therapeutic targets for ovarian cancer treatment.