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In vitro: LDC4297 inhibits CDK7 in vitro in the nano-picomolar range. The affinity of LDC4297 for CDK7 proves to be extremely high. The replication of HCMV in cultured primary human fibroblasts (HFFs) is inhibited by LDC4297 in a concentration-dependent manner with a 50% effective concentration (EC50) value of 24.5 ± 1.3 nM. Notably, CDK7 inhibition by LDC4297 is not associated with general cytotoxicity at submicromolar concentrations. In contrast, LDC4297 induces cytotoxicity in a set of tumor cell lines, i.e., already at extremely low, nanomolar concentrations in specific cases. Anti-HCMV activity of LDC4297 is exerted through a multifaceted mode of action that involves an interference with virus-induced Rb phosphorylation. In vivo: The PK analyses of LDC4297 performed thus far have also been highly promising. An analysis of the PK parameters in CD1 mice reveals positive characteristics after oral administration, as demonstrated for a single-dose treatment (100 mg/kg of LDC4297. The half-life (t1/2z) is determined to be 1.6 h, and a time (Tmax) to a mean peak plasma concentration of 1,297.6 ng/ml is reached 0.5 h after administration, with a continued presence of LDC4297 plasma levels for at least 8 h and a bioavailability of 97.7%.
| Cell Experiment | |
|---|---|
| Cell lines | human fibroblasts |
| Preparation method | A trypan blue exclusion assay is performed with cultured cells seeded in 24-well plates and incubated with increasing concentrations of antiviral compounds (range, 0.1 to 50 μM) for the durations indicated. Cell staining is achieved with 0.1% trypan blue for 10 min at room temperature before the percentage of viable cells is determined by microscopic counting. |
| Concentrations | 0.1 to 50 μM |
| Incubation time | 3 days |
| Animal Experiment | |
|---|---|
| Animal models | CD-1 mice |
| Formulation | |
| Dosages | 100 mg/kg |
| Administration | oral administration |
| Molecular Weight | 432.52 |
| Formula | C23H28N8O |
| CAS Number | 1453834-21-3 |
| Solubility (25°C) | 86 mg/mL in DMSO |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
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| ML 315
ML 315 is a selective dual inhibitor of CDK and DYRK with IC50s of 68 nM and 282 nM, respectively. |
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