Details

Autor(en) / Beteiligte

• Xie, Feng
• Zhou, Xiaoxue
• Li, Heyu
• Su, Peng
• Liu, Sijia
• Li, Ran
• Zou, Jing
• Wei, Xiang
• Pan, Chen
• Zhang, Zhengkui
• Zheng, Min
• Liu, Zhuang
• Meng, Xuli
• Ovaa, Huib
• ten Dijke, Peter
• Zhou, Fangfang
• Zhang, Long

Titel

USP8 promotes cancer progression and extracellular vesicle‐mediated CD8+ T cell exhaustion by deubiquitinating the TGF‐β receptor TβRII

Ist Teil von

• The EMBO journal, 2022-08, Vol.41 (16), p.e108791-n/a

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2022

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• TGF‐β signaling is a key player in tumor progression and immune evasion, and is associated with poor response to cancer immunotherapies. Here, we identified ubiquitin‐specific peptidase 8 (USP8) as a metastasis enhancer and a highly active deubiquitinase in aggressive breast tumors. USP8 acts both as a cancer stemness‐promoting factor and an activator of the TGF‐β/SMAD signaling pathway. USP8 directly deubiquitinates and stabilizes the type II TGF‐β receptor TβRII, leading to its increased expression in the plasma membrane and in tumor‐derived extracellular vesicles (TEVs). Increased USP8 activity was observed in patients resistant to neoadjuvant chemotherapies. USP8 promotes TGF‐β/SMAD‐induced epithelial‐mesenchymal transition (EMT), invasion, and metastasis in tumor cells. USP8 expression also enables TβRII+ circulating extracellular vesicles (crEVs) to induce T cell exhaustion and chemoimmunotherapy resistance. Pharmacological inhibition of USP8 antagonizes TGF‐β/SMAD signaling, and reduces TβRII stability and the number of TβRII+ crEVs to prevent CD8+ T cell exhaustion and to reactivate anti‐tumor immunity. Our findings not only reveal a novel mechanism whereby USP8 regulates the cancer microenvironment but also demonstrate the therapeutic advantages of engineering USP8 inhibitors to simultaneously suppress metastasis and improve the efficacy of cancer immunotherapy. Synopsis TGF‐β signaling is a key factor in tumor progression and is associated with poor response to cancer immunotherapy. This work shows that pharmacologically targeting the deubiquitinase USP8 can antagonise TGF‐β/SMAD signalling and improve the efficacy of cancer immunotherapy USP8 is a metastasis enhancer that directly deubiquitinates and stabilises TGF‐β receptor TβRII, thereby promoting TGF‐β/SMAD signaling. Gain of USP8 function promotes the secretion of TβRII+ circulating extracellular vesicles that induce CD8+ T cell exhaustion. Pharmacological inhibition of USP8 represses TGF‐β signalling and inhibits cancer progression. USP8 inhibition alleviates CD8+ T cell exhaustion and improves the efficacy of breast cancer immunotherapy. Graphical Abstract A novel mechanism of cancer microenvironment regulation by the drug‐targetable deubiquitinase USP8 offers the possibility of simultaneously suppressing metastasis and improving immunotherapy efficacy.