Biochem/physiol Actions

Target IC₅₀: 10.8, 10.6, 11.4, and 31.5 µ

Primary TargetLDH-A/LDH-1

Cell permeable: yes

General description

A cell-permeable, non-cytotoxic N-hydroxyindole (NHI) carboxylate that acts as a potent, reversible, and isoform selective inhibitor of lactic dehydrogenase (LDH) A/LDH-1. Inhibition appears to be competitive with respect to both pyruvate (K_i = 4.7 µM) and NADH (cofactor; K_i = 8.9 µM). Acts by occupying the whole substrate pocket and part of the cofactor pocket of LDH-A. Blocks the growth of various cancer cell lines by causing an arrest at G1 phase and inducing apoptosis (IC₅₀ = 10.8, 10.6, 11.4, and 31.5 µM for A2780/cOHP, MSTO-211H, NIH-H28, and H630 cells, respectively). Exhibits enhanced anticancer activity under hypoxic conditions (GI₅₀ = 0.90 µM/hypoxia vs. 16.3 µM/normoxia in LPC006 cultures) and strongly synergizes with gemcitabine (Cat. No. 504594).Please note that the molecular weight for this compound is batch-specific due to variable water content. Please refer to the vial label or the certificate of analysis for the batch-specific molecular weight. The molecular weight provided represents the baseline molecular weight without water.

A cell-permeable, noncytotoxic NHI (N-hydroxyindole) carboxylate that acts as an isoform A-selective LDH inhibitor (87% inhibition of hLDH-A₄ vs 11% inhibition of hLDH-B₄ at 125 µM; [NADH] = 25 µM & [pyruvate] = 2 mM) in a competitive manner with respect to both NADH (K_i = 8.9 µM; [pyruvate] = 2 mM) and pyruvate (K_i = 4.7 µM; [NADH] = 200 µM). Shown to effectively inhibit de novo D-[1,6-¹³C₂] glucose-derived lactate production in HeLa cultures (80% and ﹤5% of control Lac/Glu ratio in 12 h, respectively, with 400 and 500 µM inhibitor) and exhibit enhanced anticancer activity under hypoxic conditions (GI₅₀ by SRB assays = 0.90 µM/hypoxia vs. 16.3 µM/normoxia in LPC006 cultures), while diplaying little antiproliferation activity toward non-tumorigenic hTERT-HPNE (ductal pancreatic) and Hs27 (skin fibroblast) even at concentrations as high as 100 µM;.

A cell-permeable, both NADH and pyruvate-competitive isoform A-selective LDH inhibitor. Exhibits enhanced anticancer activity under hypoxic conditions.

Legal Information

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

Other Notes

Maftouh, M., et al. 2014. Br. J. Cancer.110, 172.Granchi, C., et al. 2011. J. Med. Chem.54, 1599.

Reconstitution

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

Warning

Toxicity: Standard Handling (A)