SB525334

SB525334 is a potent and selective inhibitor of TGFβ receptor I (ALK5) with IC50 of 14.3 nM, is 4-fold less potent to ALK4 than ALK5 and inactive to ALK2, 3, and 6.

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SB525334 Chemical Structure

SB525334 Chemical Structure
Molecular Weight: 343.42

Validation & Quality Control

Customer Reviews(1)

Quality Control & MSDS

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Product Description

Biological Activity

Description SB525334 is a potent and selective inhibitor of TGFβ receptor I (ALK5) with IC50 of 14.3 nM, is 4-fold less potent to ALK4 than ALK5 and inactive to ALK2, 3, and 6.
Targets TGFβR1(ALK5) [1]
IC50 14.3 nM
In vitro SB 525334 shows no inhibition in the enzymes ALK2, 3, and 6, with IC50 values > 10 μM. SB 525334 blocks phosphorylation induced by TGF-β1 and nuclear translocation of Smad2/3 in renal proximal tubule cells. SB 525334 also inhibits the increased mRNA expression levels of plasminogen activator inhibitor-1 (PAI-1) and procollagen α1(I) induced by TGF-β1 in A498 renal epithelial carcinoma cells at 1 μM). [1] SB 525334 (1 μM) attenuates the heightened sensitivity to TGF-β1 exhibited by pulmonary artery smooth muscle cells (PASMCs) from patients with familial forms of idiopathic pulmonary arterial hypertension (PAH). [2]
In vivo SB 525334 (10 mg/kg/day) decreases the renal mRNA levels of PAI-1, procollagen α1(I), and procollagen α1(III) in a nephritis-induced renal fibrosis rat model. Furthermore, PAN-induced proteinuria is significantly inhibited by SB 525334 (10 mg/kg/day). [1] SB 525334 may also be efficacious in mesenchymal tumors. SB 525334 (10 mg/kg/day) significantly decreases uterine mesenchymal tumor incidence, multiplicity, and size in Eker rats. [3] SB 525334 significantly reverses pulmonary arterial pressure and inhibits right ventricular hypertrophy in a rat model of PAH. This is revealed by a significant reduction in pulmonary arteriole muscularization induced by monocrotaline (used to induce PAH) after treatment with SB 525334 (3 or 30 mg/kg). [2] In a Bleomycin-induced pulmonary fibrosis mice model, SB 525334 (10 mg/kg or 30 mg/kg) attenuates the histopathological alterations in the lung, and significantly decreased mRNA expression of Type I and III procollagen and fibronectin. SB 525334 also attenuates Smad2/3 nuclear translocation, myofibroblast proliferation, deposition of Type I collagen, and decreases CTGF-expressing cells. [4]
Features

Protocol(Only for Reference)

Kinase Assay: [1]

Kinase assay to determine the potency and selectivity of SB 525334 In order to determine the potency of SB 525334, purified GST-tagged kinase domain of ALK5 is incubated with purified GST-tagged full-length Smad3 in the presence of 33P-γATP and different concentrations of SB 525334. The readout is radioactively labeled Smad3. To determine the selectivity of SB 525334, purified GST-tagged kinase domain of ALK2 and ALK4 are incubated with GST-tagged full-length Smad1 and Smad3, respectively, in the presence of different concentrations of SB 525334. IC50 values are calculated.

Cell Assay: [1]

Cell lines Human renal proximal tubule epithelial (RPTE) cells
Concentrations 1 μM
Incubation Time 1 hour
Method RPTE cells are seeded on microscope slides. The following day, the cells are starved for 24 hours to dosing by removal of the serum and epidermal growth factor. Cells are treated with either 10 ng/mL TGF-β1, 1 μM SB 525334, or a combination of both. Slides are pretreated with SB 525334 or starve media for 3 hours prior to a 1-hour incubation at 37 °C with TGF-β1 or starve media. The cells are then fixed and permeabilized. The slides are blocked with BSA, incubated with a mouse anti-Smad2/3 primary antibody followed by an anti-mouse IgG fluorescein secondary antibody. The slides are then viewed in a confocal microscope and nuclear signal intensity is analyzed.

Animal Study: [3]

Animal Models Bleomycin-induced pulmonary fibrosis in female Eker rats
Formulation 200 mg/L in drinking water
Dosages Estimated dose of 10 mg/kg/day
Administration Oral (in drinking water)
Solubility 30% propylene glycol, 5% Tween 80, 65% D5W, , 20 mg/mL
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
1

References

[1] Grygielko ET, et al. J Pharmacol Exp Ther, 2005, 313(3), 943-951.

[2] Thomas M, et al. Am J Pathol, 2009, 174(2), 380-389.

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Chemical Information

Download SB525334 SDF
Molecular Weight (MW) 343.42
Formula

C21H21N5

CAS No. 356559-20-1
Storage 3 years -20℃Powder
6 months-80℃in DMSO
Synonyms
Solubility (25°C) * In vitro DMSO 69 mg/mL (200 mM)
Water <1 mg/mL (<1 mM)
Ethanol 69 mg/mL (200 mM)
In vivo 30% propylene glycol, 5% Tween 80, 65% D5W, 20 mg/mL
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
Chemical Name 6-(2-tert-butyl-4-(6-methylpyridin-2-yl)-1H-imidazol-5-yl)quinoxaline

Research Area

Customer Reviews (1)


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Rating
Source SB525334 purchased from Selleck
Method ALP assay/Quantitative RT-PCR
Cell Lines C3H10T1/2 cells
Concentrations 10 μM
Incubation Time
Results Cotreatment with SB-431542 or SB-525334 has not only inhibited ALP activities compared with vehicle treatment but also abrogated the TAZ-mediated enhancement of ALP activities.

Product Citations (4)

Tech Support & FAQs

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