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Fas-associated factor (Faf1) is a novel CD40 interactor that regulates CD40-induced NF-κB activation via a negative
T Elmetwali1, L S Young2, D H Palmer1
1Cancer Research UK Centre, University of Liverpool, Daulby Street, Liverpool, UK.
Cell Death & Disease
|May 10, 2014
Summary
Fas-Associated Factor 1 (FAF1) interacts with CD40, regulating NFκB signaling. FAF1 acts as a negative feedback mechanism, and its loss may drive cancer through uncontrolled NFκB activation.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- CD40 signaling is crucial for immune responses and is mediated by TRAF recruitment.
- The interaction partners of CD40 beyond TRAFs are not fully elucidated.
Purpose of the Study:
- To identify novel CD40 interacting proteins.
- To investigate the role of identified proteins in CD40-mediated signaling pathways, particularly NFκB activation.
Main Methods:
- Yeast two-hybrid screening using CD40 cytoplasmic tail.
- In vitro and in vivo interaction assays.
- NFκB reporter assays and gene knockdown/overexpression studies.
Main Results:
- Fas-Associated Factor 1 (FAF1) was identified as a CD40 interacting protein.
- FAF1 binds to the TRAF6-binding domain of CD40.
- FAF1 expression is induced by CD40 ligation in an NFκB-dependent manner.
- FAF1 negatively regulates CD40-induced NFκB activation.
Conclusions:
- FAF1 plays a novel role in negatively regulating CD40-induced NFκB activation.
- Dysregulation of FAF1 may contribute to oncogenesis in human malignancies.
- FAF1 could serve as a biomarker for NFκB-targeted therapies.
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