| Description |
AR-C155858 is a selective monocarboxylate transporter MCT1 and MCT2 inhibitor with Kis of 2.3 nM and 10 nM, respectively.
|
| Related Catalog |
|
| Target |
Ki: 2.3 nM (MCT1), 10 nM (MCT2)
|
| In Vitro |
AR-C155858 (10 nM-100 nM) inhibits MCT1/MCT2 C-terminal chimaeras[1]. AR-C155858 inhibits MCT2, and the 70% inhibition seen at 10 nM is followed by a gradually increasing inhibition which can only be explained by a Ki value of significantly less than 10 nM. AR-C155858 inhibits MCT1 expressed in Xenopus oocytes in a time- and concentration-dependent manner[2].
|
| Kinase Assay |
MCT kinetic assays are performed by monitoring intracellular pH with H+-sensitive dye BCECF or by determining the uptake of l-[14C]lactate (7.4 MBq/mL). The uptake buffer containes 75 mM NaCl, 2 mM KCl, 0.82 mM MgCl2, 1 mM CaCl2 and 20 mM Tris/Hepes (pH 7.4). AR-C155858 inhibitor titrations are performed at pH 6 with oocytes preincubated for 45 min in a different uptake buffer (75 mM NaCl, 2 mM KCl, 0.82 mM MgCl2, 1 mM CaCl2 and 20 mM Mes, pH 6) containing the required concentration of AR-C155858 prior to measuring the uptake of l-[14C]lactate (0.5 mM). Unless stated otherwise, uptake is determined over 2.5 min for all MCT constructs except for MCT2trn with or without embigin and MCT2/1 with or without embigin, where 5 and 10 min are used respectively.
|
| Cell Assay |
The erythrocytes (5% haematocrit) are pre-incubated for 1 h at room temperature (22°C) with or without AR-C155858 at the required concentration before assaying transport of l-lactate (10 mM) at 6°C. Initial rates of transport are calculated by first-order regression analysis of the time course of pH change and converted into nmol of H+/min by determining the pH change induced by small additions of standardized NaOH.
|
| References |
[1]. Ovens MJ, et al. The inhibition of monocarboxylate transporter 2 (MCT2) by AR-C155858 is modulated by the associated ancillary protein. Biochem J. 2010 Oct 15;431(2):217-25. [2]. Ovens MJ, et al. AR-C155858 is a potent inhibitor of monocarboxylate transporters MCT1 and MCT2 that binds to an intracellular site involving transmembrane helices 7-10. Biochem J. 2010 Jan 15;425(3):523-30. [3]. Vijay N, et al. A Novel Monocarboxylate Transporter Inhibitor as a Potential Treatment Strategy for γ-Hydroxybutyric Acid Overdose. Pharm Res. 2015 Jun;32(6):1894-906.
|
