The FBXW7-binding sites on FAM83D are potential targets for cancer therapy

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• The oncogenic role of FAM83D in human cancers is recognized, but its precise mechanisms remain elusive.
• Understanding FAM83D's interactions is key to elucidating its contribution to cancer progression.

Purpose of the Study:

• To investigate the significance of the interaction between FAM83D and FBXW7 in breast cancer (BC).
• To identify and characterize the FBXW7-binding sites on FAM83D and their role in oncogenesis.

Main Methods:

• Systematic mapping of FBXW7-binding sites on FAM83D using mutational analysis.
• Co-immunoprecipitation assays to validate protein interactions.
• In vitro and in vivo experiments to assess the functional impact of mutations.

Main Results:

• Mutations at FBXW7-binding sites on FAM83D abrogated its ability to promote FBXW7 ubiquitination and degradation.
• These mutations significantly impaired cancer cell proliferation, migration, and invasion in vitro.
• Disruption of FBXW7-binding sites reduced tumor growth and metastasis in vivo.
• Higher FAM83D expression correlated with poorer prognosis independently of molecular subtypes and conferred chemotherapy resistance in BC.

Conclusions:

• The FBXW7-binding sites on FAM83D are essential for its oncogenic functions in breast cancer.
• FAM83D's interaction with FBXW7 is a critical determinant of its role in tumor progression and chemoresistance.
• Targeting FAM83D-FBXW7 interaction presents a promising therapeutic strategy for breast cancer treatment.