The NEDD4/FLRT2 axis regulates NSCLC cell stemness

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• Lung cancer is a leading cause of cancer-related death, with non-small cell lung cancer (NSCLC) posing significant treatment challenges.
• Cancer stem cells (CSCs) play a crucial role in the development and progression of NSCLC.
• The neuronally expressed developmentally downregulated 4 (NEDD4) and fibronectin leucine-rich transmembrane 2 (FLRT2) axis warrants investigation for its role in NSCLC stemness.

Purpose of the Study:

• To investigate the influence of the NEDD4-FLRT2 axis on cancer stemness in NSCLC.
• To elucidate the underlying molecular mechanisms by which NEDD4 and FLRT2 regulate NSCLC stem cell properties.

Main Methods:

• Western blot and RT-qPCR to assess FLRT2 expression in NSCLC tissues and stem cells.
• Sphere formation assays and stemness marker analysis to confirm NSCLC stemness.
• Cell proliferation, migration, apoptosis assays, and xenograft mouse models to evaluate antitumor effects and tumorigenesis in vivo.
• Co-immunoprecipitation (Co-IP) assays to confirm the interaction between NEDD4 and FLRT2.

Main Results:

• FLRT2 expression was found to be reduced in NSCLC tissues, cells, and NSCLC stem cells.
• FLRT2 upregulation inhibited NSCLC stem cell proliferation, sphere formation, and drug resistance, while promoting apoptosis.
• NEDD4 was identified as an E3 ligase that promotes the ubiquitination and degradation of FLRT2 protein.
• NEDD4 overexpression counteracted the inhibitory effects of FLRT2 on NSCLC stemness, both in vitro and in vivo.

Conclusions:

• FLRT2 functions as a tumor suppressor in NSCLC by inhibiting cancer stemness.
• NEDD4 promotes NSCLC stem cell tumorigenesis by enhancing the degradation of FLRT2.
• Targeting the NEDD4-FLRT2 axis may offer a novel therapeutic strategy for NSCLC treatment.