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Cat. No. M3563
KW-2478 Structure
Size Price Availability
5mg USD 190  USD190 Out of stock
10mg USD 260  USD260 Out of stock
50mg USD 720  USD720 Out of stock
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Quality Control
  • Current batch:
  • Purity >98%
  • COA
  • MSDS
Biological Activity

KW-2478 is a novel non-ansamycin potent Hsp90 inhibitor with an IC50 of 3.8 nM. KW-2478 is a novel non-purine analogue antagonist for Hsp90. KW-2478 suppressed the binding of bRD to HSP90α in concentration-dependent manner. KW-2478 indicated a potent anti-cancer activity both in vitro and in vivo. KW-2478 clearly prevented cancer cell growth in all cell lines, with EC50 of 101-252, 81.4-91.4 and 120-622 nM for B-cell lymphoma, mantle cell lymphoma and multiple myeloma, respectively. KW-2478 also showd potent growth inhibitory activity in primary CLL (n=3) and NHL (n=2) cells with EC50 of 40-170 nM and 200-400 nM, respectively. KW-2478 depleted the Hsp90 client Cdk9, a transcriptional kinase, and the phosphorylated 4E-BP1, a translational inhibitor. Both inhibitory effects of KW-2478 on such transcriptional and translational pathways were shown to reduce c-Maf and cyclin D1 expression. In NCI-H929 s.c. inoculated model, KW-2478 displayed a significant inhibition of tumor growth and induced the degradation of client proteins in tumors.

Cell Experiment
Cell lines OPM-2/GFP, KMS-11, RPMI 8226, and NCI-H929 cells
Preparation method To measure the IC50, plating OPM-2/green fluorescent protein (GFP) cells, KMS-11 cells, OPM-2/GFP and other cells into 96-well plates and treating them with KW-2478. 72 hours of cultivation later, using Cell Proliferation Reagent WST-1 to determine cell viability . WST reagent is added to the wells, followed by incubation for 4 hours at 37 °C. After that, measuring the absorbance at 450 nm with reference at 650 nm with a microplate spectrophotometer. To examine time dependency of antiproliferative activity of KW-2478, plating the cells into 96-well V-bottomed plates and treating with KW-2478. After 0 hour and at intervals from 3 to 72 hours at 37 °C, the supernatant is aspirated. After drug-free medium is added to the wells, the supernatant is aspirated again. Finally, adding drug-free medium to the wells, and the plates are further incubated for the remainder of the 72-hour period, followed by measurement of cell viabil
Concentrations 0.05 - 5 μM
Incubation time 3 days
Animal Experiment
Animal models NCI-H929 tumors s.c. inoculated in SCID mice, OPM-2/GFP i.v. inoculated mouse model
Formulation sterile 0.9% sodium chloride solution
Dosages 25, 50 , 100 and 200 mg/kg
Administration Orally administrated once daily for 5 days
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 Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 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 Compound A of 10 mg/kg.

Chemical Information
Molecular Weight 574.66
Formula C30H42N2O9
CAS Number 819812-04-9
Purity >98%
Solubility DMSO 100 mg/mL
Storage at -20°C
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Keywords: KW-2478 supplier, HSP, inhibitors

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