A cell-permeable thieno[2,3-d]pyrimidinedione compound that acts as a highly potent inhibitor of monocarboxylate transporter 1 (MCT1; K_i = 2.3 nM for lactate uptake in rat erythrocytes). Also shown to inhibit MCT2 when associated with basigin (IC₅₀ = 10 nM). Does not affect the activity of MCT4 even at higher concentration. Also shown to block MCT1 expressed in Xenopus oocytes Binds to MCT1 from the intracellular side involving transmembrane helices 7-10. Its inhibitory effect is significantly reduced with either F360Y or S364G mutations (~100 nM) and the inhibitory effect is lost with both sites are mutated (~5 µM). Displays high metabolic stability and low inhibition of CYP. Shown to block lactate transport and increase intracellular lactate levels in Raji Burkitt and MCF-7 cells and reduces their proliferation.

Monocarboxylate Transport Inhibitor, AR-C155858, CAS 496791-37-8, is a cell-permeable, potent inhibitor of monocarboxylate transporter 1 (MCT1; K_i = 2.3 nM for lactate uptake in rat erythrocytes).

Cell permeable: yes

Primary Target
MCT1

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 3 months at -20°C.

Nancolas, B., et al. 2015. Biochem. J.467, 192.
Ovens, M. J. et al. 2010. Biochem. J.425, 523.
Guile, S. D., et al. 2007. J. Med. Chem.50, 254.

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Toxicity: Standard Handling (A)