Interplay between estrogen and Stat3/NF-κB-driven immunomodulation in lung cancer

Area of Science:

• Oncology
• Immunology
• Endocrinology

Background:

• K-ras mutant lung adenocarcinoma (LUAD) is a prevalent cancer with poor prognosis, linked to tumor-promoting inflammation.
• Epithelial Stat3 signaling exhibits gender-specific roles in K-ras mutant LUAD pathogenesis.
• Stat3 deficiency in males promotes tumorigenesis and inflammation, while in females, it reduces tumorigenesis and enhances anti-tumor immunity.

Purpose of the Study:

• To investigate the mechanisms behind the gender disparity in K-ras mutant LUAD driven by epithelial Stat3.
• To explore the roles of estrogen and nuclear factor-kappaB (NF-κB) signaling in this gender-specific phenomenon.

Main Methods:

• Utilized K-ras mutant mice with epithelial Stat3 deficiency (LR/Stat3Δ/Δ).
• Manipulated estrogen levels through oophorectomy and replacement therapy.
• Administered exogenous estrogen to male mice.
• Genetically targeted epithelial NF-κB activity.

Main Results:

• In LR/Stat3Δ/Δ females, estrogen deprivation increased tumor burden and immunosuppression; estrogen replacement reversed these effects.
• In males, exogenous estrogen inhibited tumorigenesis, reduced NF-κB-driven immunosuppression, and boosted anti-tumor immunity.
• Targeting epithelial NF-κB reduced tumorigenesis and enhanced anti-tumor immunity in males, but not females.

Conclusions:

• Estrogen demonstrates a context-specific anti-tumor effect in K-ras mutant LUAD by inhibiting NF-κB-driven inflammation.
• Findings provide insights for developing personalized therapeutic strategies for K-ras mutant LUAD based on gender and hormonal status.