MDM-2/p53 Degrader

Seldegamadlin (KT-253) is a selective p53 stabilizer and a MDM2 PROTAC degrader (DC₅₀ = 0.4 nM). Seldegamadlin inhibits the proliferation of cancer cell RS4;11 with an IC₅₀ of 0.3 nM, arrests the cell cycle at G2/M phase, and induces apoptosis. Seldegamadlin upregulates p53 activity and overcomes the p53-MDM2 feedback loop. Seldegamadlin can be used for the study of hematologic and solid tumors, such as acute myeloid leukemia (AML) and acute lymphoblastic leukemia (ALL).

YX-02-030 is a VHL-dependent MDM2 PROTAC degrader with a K_d of 35 nM. YX-02-030 recruits the VHL E3 ligase to form a ternary complex, leading to ubiquitination and proteasome-mediated degradation of MDM2. YX-02-030 inhibits MDM2-p53 and VHL-HIF1α binding with IC₅₀ values of 63 and 1350 nM. YX-02-030 activates TAp73, upregulates p53 family target genes and induces apoptosis. YX-02-030 demonstrates on-target efficacy in TNBC xenograft-bearing mice, extending survival without normal cell toxicity.

MD-4251 is an orally active MDM2 PROTAC degrader. MD-4251 potently degrades MDM2 in RS4;11 cells (DC₅₀: 0.2 nM) and actives p53. MD-4251 shows strong antiproliferative activity against acute leukemia cells (wild-type p53) with minimal efficacy in mutant type. MD-4251 induces complete tumor regression in RS4;11 xenograft mice model.

MD-265 is a PROTAC degrader targeting MDM2, which activates p53 in cancer cells carrying wild-type p53. MD-265 induces MDM2 degradation by recruiting the CRL4-CRBN ligase complex via the ubiquitination and proteasomal degradation pathway. MD-265 upregulates p53 target genes, induces apoptosis, reduces Mcl-1 levels, increases caspase-3 cleavage, and inhibits colony formation of wild-type p53 leukemia stem cells. MD-265 can be used in research related to leukemia and acute myeloid leukemia.

WB156 is a dual MDM2 and GSPT1 degrader. WB156 can recruit CRBN (Cereblon, a substrate receptor of the E3 ubiquitin-ligase complex) to induce the ubiquitination-proteasome pathway-mediated degradation of MDM2 and GSPT1. WB156 is promising for research of cancers, such as leukemia.

WB214 is an MDM2 and GSPT1 degrader with human MDM2 K_i >10 μM. WB214 induces a neo-interaction between MDM2 and the cereblon E3 ligase complex, triggering MDM2 ubiquitination, proteasomal degradation, and bystander p53 degradation, and does not bind MDM2’s p53 binding region. WB214 induces GSPT1 degradation, and exhibits anti-proliferative activity in leukemia cells. WB214 can be used for the research of leukemia.