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Cat. No. M5263
LDC4297 Structure


Size Price Availability Quantity
5mg USD 150 In stock
10mg USD 240 In stock
50mg USD 780 In stock
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Quality Control
  • Current batch:
  • Purity >99%
  • COA
  • MSDS
Biological Activity

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
Dosages 100 mg/kg
Administration oral administration
Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)
Species Mouse Rat Rabbit Guinea pig Hamster Dog
Weight (kg) 0.02 0.15 1.8 0.4 0.08 10
Body Surface Area (m2) 0.007 0.025 0.15 0.05 0.02 0.5
Km factor 3 6 12 8 5 20
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.

Chemical Information
Molecular Weight 432.52
Formula C23H28N8O
CAS Number 1453834-21-3
Purity >99%
Solubility 86 mg/mL in DMSO
Storage at -20°C

A novel CDK7 inhibitor of the Pyrazolotriazine class exerts broad-spectrum antiviral activity at nanomolar concentrations.
Hutterer C, et al. Antimicrob Agents Chemother. 2015 Apr;59(4):2062-71. PMID: 25624324.

Cyclin-dependent kinase 7 controls mRNA synthesis by affecting stability of preinitiation complexes, leading to altered gene expression, cell cycle progression, and survival of tumor cells.
Kelso TW, et al. Mol Cell Biol. 2014 Oct 1;34(19):3675-88. PMID: 25047832.

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Keywords: LDC4297, LDC044297 supplier, CDK, inhibitors

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