Ubiquitination and deubiquitination processes regulate the stability of PD-1, affecting T cell biology. Here the authors identify the ubiquitin-specific protease 5 (USP5) as a deubiquitinase for PD-1 and show that USP5 inhibition in combination with a MEK inhibitor or anti-CTLA-4 could promote anti-tumor immune responses in preclinical models.
- Xiangling Xiao
- Jie Shi
- Jinfang Zhang
