biological activity | SGI-1776 free base is a novel, ATP-competitive Pim1 inhibitor, the IC50 in the cell-free assay is 7 nM, which is 50 and 10 times more selective than Pim2 and Pim3, respectively, and is also effective for Flt3 and haspin. SGI-1776 can induce apoptosis and autophagy. Phase 1. |
Target | TargetValue Pim1 (Cell-free assay) 7 nM FLT3 (Cell-free assay) 44 nM Pim3 (Cell-free assay) 69 nM Pim2 (Cell-free assay) 363 nM |
Target | Value |
Pim1
(Cell-free assay)
| 7 nM |
FLT3
(Cell-free assay)
| 44 nM |
Pim3
(Cell-free assay)
| 69 nM |
Pim2
(Cell-free assay)
| 363 nM |
in vitro study | In addition to Pim, SGI-1776 was also effective at FLT3 (IC50 = 44nm). SGI-1776 treatment of AML cells induces apoptosis in a concentration-dependent manner. SGI-1776 acts on AML primary cells, is toxic, and results in a Mcl-1 protein reduction. SGI-1776 treatment of CLL cells induced apoptosis in a dose-dependent manner. SGI-1776 acts on CLL, inducing apoptosis, and the mechanism of action involves a Mcl-1 reduction. Induction of apoptosis, accompanied by inhibition of RNA synthesis, was observed in SGI-1776 treated CLL cells. In vitro, SGI-1776 was toxic with a mean relative IC50 value of 3.1 mM. In contrast, SGI-1776 induced an intact subcutaneous MV4;11 response. |
in vivo study | SGI-1776 is effective in a MV-4-11 tumor-bearing mouse model. SGI-1776 acts on leukemia and solid tumor cell lines and has preclinical activity with IC50 of 0.005-11.68 mM. In vivo, SGI-1776 acts on 9 out of 31 solid xenografts and 1 out of 8 ALL xenografts, significantly inducing differentiation in the EFS profile. |