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Cat. No. M2108
SB-525334 Structure
Size Price Availability Quantity
Free Sample (0.5-1 mg)  USD 0 In stock
5mg USD 61  USD61 In stock
10mg USD 97  USD97 In stock
50mg USD 366  USD366 In stock
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Biological Activity

SB-525334 is a potent and selective inhibitor of the transforming growth factor-beta1 (TGF-beta1) receptor, activin receptor-like kinase (ALK5). In cell-based assays, SB-525334 (1 microM) blocked TGF-beta1-induced phosphorylation and nuclear translocation of Smad2/3 in renal proximal tubule cells and inhibited TGF-beta1-induced increases in plasminogen activator inhibitor-1 (PAI-1) and procollagen alpha1(I) mRNA expression in A498 renal epithelial carcinoma cells. SB-525334 inhibited ALK5 kinase activity with an IC50 of 14.3 nM and was approximately 4-fold less potent as an inhibitor of ALK4 with IC50 of 58.5 nM. SB-525334 significantly increased apoptotic cell death in gemcitabine-resistant cells. SB-525334 reverses pulmonary arterial pressure and inhibits right ventricular hypertrophy in a rat model of PAH effectively. SB-525334 treatment showed significant attenuation in Smad2/3 nuclear translocation, decrease in CTGF-expressing cells, myofibroblast proliferation and type I collagen deposition.

Product Citations
Customer Product Validations & Biological Datas
Source Am J Physiol Renal Physiol (2015). Figure 4. SB-525334
Method Endothelial function
Cell Lines rats
Concentrations -
Incubation Time 24-h
Results Aortic endothelial cell lysates obtained from the four groups of rats on day 7 of the experiment demonstrated activation of ALK5 by HS intake as well as the anticipated inhibition of ALK5 by SB-525334
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 343.42
Formula C21H21N5
CAS Number 356559-20-1
Purity >99%
Solubility DMSO 60 mg/mL
Ethanol 40 mg/mL
Storage at -20°C

[1] Thomas M, et al. Am J Pathol. Activin-like kinase 5 (ALK5) mediates abnormal proliferation of vascular smooth muscle cells from patients with familial pulmonary arterial hypertension and is involved in the progression of experimental pulmonary arterial hypertension induced by monocrotaline.

[2] Laping NJ, et al. Clin Cancer Res. Tumor-specific efficacy of transforming growth factor-beta RI inhibition in Eker rats.

[3] Higashiyama H, et al. Exp Mol Pathol. Inhibition of activin receptor-like kinase 5 attenuates bleomycin-induced pulmonary fibrosis.

[4] Grygielko ET, et al. J Pharmacol Exp Ther. Inhibition of gene markers of fibrosis with a novel inhibitor of transforming growth factor-beta type I receptor kinase in puromycin-induced nephritis.

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Keywords: SB-525334 supplier, TGF-beta/Smad, inhibitors

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