Molecular Weight(MW): 335.4
SB505124 is a selective inhibitor of TGFβR for ALK4, ALK5 with IC50 of 129 nM and 47 nM in cell-free assays, respectively, also inhibits ALK7, but does not inhibit ALK1, 2, 3, or 6.
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(D): Fluorescence micrographs of SOX2/FOXA2 double-staining of the conditions mentioned above. The TGF-b inhibitor SB-505124 (1 mM) was additionally used together with the complete medium. Nuclei were counterstained with DAPI. Original magnification 310 or 340. Abbreviations: DAPI, 40,6-diamidino-2-phenylindole; RA, retinoic acid.
Stem Cells, 2016, 34:2635-2647.. SB505124 purchased from Selleck.
(C) The CTX-II release from the ECM of chondrocytes treated with/without 10 nM 1α,25(OH)2D3, TNF-α and TGF-β receptor inhibitor (SB505124). The effects of 1α,25(OH)2D3 on TNF-α stimulated chondrocytes were contracted by TGF-β receptor inhibitor. Values are the means ± 95% CI.
Osteoarthritis Cartilage, 2016, 24(2):345-53. SB505124 purchased from Selleck.
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Choose Selective TGF-beta/Smad Inhibitors
|Description||SB505124 is a selective inhibitor of TGFβR for ALK4, ALK5 with IC50 of 129 nM and 47 nM in cell-free assays, respectively, also inhibits ALK7, but does not inhibit ALK1, 2, 3, or 6.|
SB505124 is identified as a reversible ATP competitive and selective ALK inhibitor of ALK4 and ALK5. SB505124 shows no toxicity to renal epithelial A498 cells at concentrations up to 100 μM for 48 hours, and blocks TGF-β–induced apoptosis of FaO cells and NRP 154 cells in a concentration-dependent manner.  In human umbilical vein endothelial cells (HUVEC), SB505124 (500 nM) blocks the changes of TGF-β1 on F-actin assembly and prevents ROS production induced by TGF-β.  By inhibiting TGF-beta1 signaling, SB505124 leads to decreased deferoxamine (DFO)-induced neurogenesis.  A recent study shows that SB505124 suppresses the migration and invasion of breast cancer MCF-7-M5 cells. 
|In vivo||In a rabbit GFS model, SB505124 decreased the intraocular pressure (IOP) levels and reduces subconjunctival cell infiltration and scarring at the surgical site in the GFS.  In tacrolimus (TAC)-treated mice and FK12EC KO mice, SB505124 prevents the activation of endothelial TGF-β receptors and induction of renal arteriolar hyalinosis. |
In Vitro Protein Kinase Assay :Kinase assays are performed as described by Laping et al., 2002 using the kinase domain of ALK5 and full-length N-terminal fused GST-Smad3. Kinase assays are performed with 65 nM GST-ALK5 and 184 nM GST-Smad3 in 50 mM HEPES, 5 mM MgCl2, 1 mM CaCl2, 1 mM dithiothreitol, and 3 μM ATP. Reactions are incubated with 0.5 μCi of [33P]γATP for 3 hours at 30 °C. Phosphorylated protein is captured on P-81 paper , washed with 0.5% phosphoric acid, and counted by liquid scintillation. Alternatively, Smad3 or Smad1 protein is also coated onto FlashPlate Sterile Basic Microplates. Kinase assays are then performed in FlashPlates with same assay conditions using either the kinase domain of ALK5 with Smad3 as substrate or the kinase domain of ALK6 (BMP receptor) with Smad1 as substrate. Plates are washed three times with phosphate buffer and counted by TopCount.
-  DaCosta Byfield S, et al. Mol Pharmacol. 2004, 65(3), 744-752.
-  Hu T, et al. Am J Physiol Renal Physiol. 2005, 289(4), F816-825.
-  Misumi S, et al. Eur J Neurosci. 2008, 28(6), 1049-1059.
|In vitro||DMSO||67 mg/mL (199.76 mM)|
|Ethanol||67 mg/mL (199.76 mM)|
|In vivo||Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
30% PEG400+0.5% Tween80+5% propylene glycol
For best results, use promptly after mixing.
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