GMB-475
目录号 : GC36167
GMB-475 is a proteolysis-targeting chimera (PROTAC) that allosterically targets BCR-ABL1 protein and recruit the E3 ligase Von Hippel-Lindau (VHL), resulting in ubiquitination and subsequent degradation of the oncogenic fusion protein.
Cas No.:2490599-18-1
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GMB-475 is a proteolysis-targeting chimera (PROTAC) that allosterically targets BCR-ABL1 protein and recruit the E3 ligase Von Hippel-Lindau (VHL), resulting in ubiquitination and subsequent degradation of the oncogenic fusion protein.
GMB-475 induces rapid proteasomal degradation and inhibition of downstream biomarkers, such as STAT5 in both human CML K562 cells and murine Ba/F3 cells expressing BCR-ABL1. GMB-475 inhibits the proliferation of certain clinically relevant BCR-ABL1 kinase domain point mutants and further sensitizes Ba/F3 BCR-ABL1 cells to inhibition by imatinib, while demonstrating no toxicity toward Ba/F3 parental cells.[1]
[1] Burslem GM, et al. Cancer Res. 2019 Sep 15;79(18):4744-4753.
Cas No. | 2490599-18-1 | SDF | |
Canonical SMILES | FC(F)(F)OC1=CC=C(NC2=CC(C3=CC=C(OCCOCC(N[C@H](C(C)(C)C)C(N4[C@H](C(NCC5=CC=C(C6=C(C)N=CS6)C=C5)=O)C[C@@H](O)C4)=O)=O)C=C3)=NC=N2)C=C1 | ||
分子式 | C43H46F3N7O7S | 分子量 | 861.93 |
溶解度 | DMSO: 250 mg/mL (290.05 mM) | 储存条件 | Store at -20°C |
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10 mM | 0.116 mL | 0.5801 mL | 1.1602 mL |
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The proteolysis targeting chimera GMB-475 combined with dasatinib for the treatment of chronic myeloid leukemia with BCR::ABL1 mutants
Front Pharmacol 2022 Oct 3;13:931772.PMID:36263131DOI:10.3389/fphar.2022.931772.
Patients with chronic myeloid leukemia (CML) show resistance to tyrosine kinase inhibitors (TKIs) targeting ABL1 due to the emergence of BCR::ABL1 mutants, especially compound mutants during the treatment, which brings great challenges to clinical practice. Combination therapy is an effective strategy for drug resistance. GMB-475, a proteolysis targeting chimera (PROTAC) targeting the myristoyl pocket of ABL1 in an allosteric manner, degrades the BCR::ABL1 through the ubiquitin-proteasome pathway. In this study, we combined GMB-475 with orthosteric TKIs targeting ABL1 to overcome resistance. We constructed Ba/F3 cells carrying BCR::ABL1 mutants by gene cloning technology and compared the effects of combination therapy with those of monotherapy on the biological characteristics and signaling pathways in CML cells. We found that the effects of ABL1 inhibitors, including imatinib, dasatinib, ponatinib, and ABL001, on growth inhibition and promoting apoptosis of Ba/F3 cells with BCR::ABL1 mutants, especially compound mutants, were weakened. GMB-475 combined with TKIs, especially dasatinib, synergistically inhibited growth, promoted apoptosis, and blocked the cell cycle of Ba/F3 cells carrying BCR::ABL1 mutants and synergistically blocked multiple molecules in the JAK-STAT pathway. In conclusion, dasatinib enhanced the antitumor effect of GMB-475; that is, the combination of PROTAC targeting ABL1 in an allosteric manner and orthosteric TKIs, especially dasatinib, provides a novel idea for the treatment of CML patients with BCR::ABL1 mutants in clinical practice.
Targeting BCR-ABL1 in Chronic Myeloid Leukemia by PROTAC-Mediated Targeted Protein Degradation
Cancer Res 2019 Sep 15;79(18):4744-4753.PMID:31311809DOI:10.1158/0008-5472.CAN-19-1236.
Although the use of ATP-competitive tyrosine kinase inhibitors of oncoprotein BCR-ABL1 has enabled durable responses in patients with chronic myeloid leukemia (CML), issues of drug resistance and residual leukemic stem cells remain. To test whether the degradation of BCR-ABL1 kinase could offer improved response, we developed a series of proteolysis-targeting chimera (PROTAC) that allosterically target BCR-ABL1 protein and recruit the E3 ligase Von Hippel-Lindau, resulting in ubiquitination and subsequent degradation of the oncogenic fusion protein. In both human CML K562 cells and murine Ba/F3 cells expressing BCR-ABL1, lead compound GMB-475 induced rapid proteasomal degradation and inhibition of downstream biomarkers, such as STAT5, and showed increased sensitivity compared with diastereomeric controls lacking degradation activity. Notably, GMB-475 inhibited the proliferation of certain clinically relevant BCR-ABL1 kinase domain point mutants and further sensitized Ba/F3 BCR-ABL1 cells to inhibition by imatinib, while demonstrating no toxicity toward Ba/F3 parental cells. Reverse phase protein array analysis suggested additional differences in levels of phosphorylated SHP2, GAB2, and SHC associated with BCR-ABL1 degradation. Importantly, GMB-475 reduced viability and increased apoptosis in primary CML CD34+ cells, with no effect on healthy CD34+ cells at identical concentrations. GMB-475 degraded BCR-ABL1 and reduced cell viability in primary CML stem cells. Together, these findings suggest that combined BCR-ABL1 kinase inhibition and protein degradation may represent a strategy to address BCR-ABL1-dependent drug resistance, and warrant further investigation into the eradication of persistent leukemic stem cells, which rely on neither the presence nor the activity of the BCR-ABL1 protein for survival. SIGNIFICANCE: Small-molecule-induced degradation of BCR-ABL1 in CML provides an advantage over inhibition and provides insights into CML stem cell biology. GRAPHICAL ABSTRACT: http://cancerres.aacrjournals.org/content/canres/79/18/4744/F1.large.jpg.