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Samotolisib (LY3023414) potently and selectively inhibits class I PI3K isoforms, DNA-PK, and mTORC1/2 with IC50s of 6.07 nM, 77.6 nM, 38 nM, 23.8 nM, 4.24 nM and 165 nM for PI3Kα, PI3Kβ, PI3Kδ, PI3Kγ, DNA-PK and mTOR, respectively.
In vitro, inhibition of PI3K/AKT/mTOR signaling by Samotolisib (LY3023414) causes G1 cell-cycle arrest and resulted in broad antiproliferative activity in cancer cell panel screens. In cell-based assays, LY3023414 inhibition of PI3K and mTOR is assessed in the PTEN-deficient U87 MG glioblastoma cell line. LY3023414 inhibits the phosphorylation of AKT at position T308 downstream of PI3K at an IC50 of 106 nM.
In vivo, LY3023414 (3, 6, or 10 mg/kg) twice daily orally for 28 days results in dose-responsive inhibition of tumor growth in the PTEN-deleted U87 MG xenograft model. This treatment produces similar TGI in models exhibiting PTEN truncation (786-O), activating PI3Kα mutation (NCI-H1975), and transgenic Eμ-myc mutant PI3Kα-driven leukemia models. Of note, the total daily dose of LY3023414 appears to result in equipotent antitumor activity: 12 mg/kg once daily and 6 mg/kg twice daily produces similar delta T/C values (42% and 38%, respectively) in U87 MG.
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Source | Oncotarget (2016 Nov). Figure 5. LY3023414 |
| Method | RNA-Seq analysis | |
| Cell Lines | BLCAb001 and BLCAb002 derived cells | |
| Concentrations | 0, 15, 120 nM | |
| Incubation Time | ||
| Results | Our RNAseq data showed BNIP3 and BCL11A upregulation, and ULK2, BAG1, RAB11FIP4 and BCLL14 downregulation in BLCAb001 tumors, mirroring the higher levels of LC3B I/II by Western blot analysis (Figure 5A and 5B). |
| Cell Experiment | |
|---|---|
| Cell lines | RKO and SK-OV-3 cells; MOLT-4 and L-363 cells; DLD-1, HCT-116, HCT-15, and NCI-H460 cells |
| Preparation method | The CellTiter-Glo luminescent cell viability assay system is used to measure the antiproliferative effects of LY3023414 after 2 cell doublings on cells plated on plastic or incubated for 2 weeks in soft agar with a collection of standard cell lines and human patient–derived tumor xenografts passaged in nude mice. For the soft-agar assay, RKO and SK-OV-3 cells; MOLT-4 and L-363 cells; DLD-1, HCT-116, HCT-15, and NCI-H460 cells are used. These standard cell lines are genotyped by STR and matched to existing STR reference genotypes. Oncotest PDX models (including model MX1 originally derived at NCI) are characterized using the Affymetrix genome-wide human SNP Array 6.0 as well as whole-exome sequencing. Genetic identity analysis confirm that all PDX models are derived from independent patient samples. Combination studies are conducted in which LY3023414 is mixed with other therapeutic agents in fixed ratios of concentrations corresponding to the IC50 equivalents of each single agent. The combination index at 50% inhibition (CI50) is calculated. |
| Concentrations | |
| Incubation time | |
| Animal Experiment | |
|---|---|
| Animal models | athymic nude, CD-1 nude and NMRI athymic nude mice(Xenograft tumors) |
| Formulation | 1% HEC in distilled water containing 0.25% polysorbate 80 and 0.05% Dow-Corning Antifoam 1510-US |
| Dosages | |
| Administration | p.o. |
| Molecular Weight | 406.48 |
| Formula | C23H26N4O3 |
| CAS Number | 1386874-06-1 |
| Solubility (25°C) | DMSO: 40 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
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PI3Kγ inhibitor AZ2 is a highly selective PI3Kγ inhibitor (The pIC50 value for PI3Kγ is 9.3). |
| NIBR-17
NIBR-17 is a pan-class I PI3K inhibitor with suitable pharmacokinetic properties and inhibits tumor growth. |
| RV-1729
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| Vulolisib
Vulolisib is a potent and orally active phosphatidylinositol 3-kinase (PI3K) inhibitor, with IC50 values of 0.2 nM, 168 nM, 90 nM and 49 nM for PI3Kα, PI3Kβ, PI3Kγ and PI3Kδ, respectively. |
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