Article
作者: Bonazzi, Simone ; Zécri, Frédéric J ; Cobb, Jennifer S ; Tullai, Jennifer ; Caro, Roxana García ; Tallarico, John A ; Porter, Jeffery A ; Clifton, Matthew C ; Sabatos-Peyton, Catherine A ; Xu, Lei ; Lu, Darlene ; Alexander, Dylan ; Magracheva, Anna ; Dales, Natalie A ; Cernijenko, Artiom ; Carbonneau, Seth ; Dranoff, Glenn ; Jain, Rishi K ; Lu, Hongbo ; Chie-Leon, Barbara ; Engelman, Jeffrey A ; Gu, Yi ; Forseth, Ry R ; Antonakos, Brandon ; Bradner, James E ; Fortnam, Bethany Hughes ; Ornelas, Elizabeth ; Briner, Karin ; Shulok, Janine ; d'Hennezel, Eva ; Visser, Michael ; Kinyamu-Akunda, Jacqueline ; Fazal, Aleem ; Thomsen, Noel M ; Wartchow, Charles A ; Hainzl, Dominik ; Ma, Xiaolei ; Beckwith, Rohan E J ; Larrow, Jay ; Bhang, Hyo-Eun C ; Wang, Y Karen ; Meyer, Matthew J ; Csibi, Alfredo ; Solomon, Jonathan M ; Ramesh, Radha
Malignant tumors can evade destruction by the immune system by attracting immune-suppressive regulatory T cells (Treg) cells. The IKZF2 (Helios) transcription factor plays a crucial role in maintaining function and stability of Treg cells, and IKZF2 deficiency reduces tumor growth in mice. Here we report the discovery of NVP-DKY709, a selective molecular glue degrader of IKZF2 that spares IKZF1/3. We describe the recruitment-guided medicinal chemistry campaign leading to NVP-DKY709 that redirected the degradation selectivity of cereblon (CRBN) binders from IKZF1 toward IKZF2. Selectivity of NVP-DKY709 for IKZF2 was rationalized by analyzing the DDB1:CRBN:NVP-DKY709:IKZF2(ZF2 or ZF2-3) ternary complex X-ray structures. Exposure to NVP-DKY709 reduced the suppressive activity of human Treg cells and rescued cytokine production in exhausted T-effector cells. In vivo, treatment with NVP-DKY709 delayed tumor growth in mice with a humanized immune system and enhanced immunization responses in cynomolgus monkeys. NVP-DKY709 is being investigated in the clinic as an immune-enhancing agent for cancer immunotherapy.