Details

Autor(en) / Beteiligte

• Guégan, Jean-Philippe
• Pollet, Justine
• Ginestier, Christophe
• Charafe-Jauffret, Emmanuelle
• Peter, Marcus E.
• Legembre, Patrick

Titel

CD95/Fas suppresses NF-κB activation through recruitment of KPC2 in a CD95L/FasL-independent mechanism

Ist Teil von

• iScience, 2021-12, Vol.24 (12), p.103538-103538, Article 103538

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• CD95 expression is preserved in triple-negative breast cancers (TNBCs), and CD95 loss in these cells triggers the induction of a pro-inflammatory program, promoting the recruitment of cytotoxic NK cells impairing tumor growth. Herein, we identify a novel interaction partner of CD95, Kip1 ubiquitination-promoting complex protein 2 (KPC2), using an unbiased proteomic approach. Independently of CD95L, CD95/KPC2 interaction contributes to the partial degradation of p105 (NF-κB1) and the subsequent generation of p50 homodimers, which transcriptionally represses NF-κB-driven gene expression. Mechanistically, KPC2 interacts with the C-terminal region of CD95 and serves as an adaptor to recruit RelA (p65) and KPC1, which acts as E3 ubiquitin-protein ligase promoting the degradation of p105 into p50. Loss of CD95 in TNBC cells releases KPC2, limiting the formation of the NF-κB inhibitory homodimer complex (p50/p50), promoting NF-κB activation and the production of pro-inflammatory cytokines, which might contribute to remodeling the immune landscape in TNBC cells. [Display omitted] •CD95 inhibits the NF-κB pathway via the partial degradation of p105 (NF-κB1)•CD95 loss in TNBC cells induces the secretion of inflammatory cytokines•CD95 C-term region interacts with KIP1 ubiquitination-promoting complex (KPC)-2•CD95 directly binds KPC2 (UBAC1), which serves as an adaptor for p65 and KPC1 Immunology; Cell biology; Cancer