TES-1025

Kinase experiment:

Recombinant hACMSD is expressed in Pichia pastoris and purified. Its enzyme activity is assayed by a coupled spectrophotometric assay. Briefly, in a pre-assay mixture, the ACMS substrate is generated from 10 μM 3-hydroxyanthranilic acid by recombinant 3-hydroxyanthranilate 3,4-dioxigenase from Ralstonia metallidurans. ACMS formation is monitored at 360 nm, and after the reaction is complete, an appropriate amount of ACMSD is added. Activity is calculated from the initial rate of the absorbance decrease subtracted from that of a control reaction mixture in the absence of ACMSD. The effects of the various compounds (e.g., TES-1025) on the enzyme activity are tested by adding the compounds to the assay mixture along with ACMSD. For the IC50 evaluations for each compound, a serial dilution from a stock solution prepared in DMSO is tested, maintaining a DMSO concentration in all the reaction mixtures of 1.0%. One unit is defined as the amount of enzyme that consume 1 μmol of ACMS per minute at 37°C[1].

Animal experiment:

Mice[1]Male CD-1 mice are used.The study is conducted in 3 phases. Phase 1: 18 mice receive an oral administration of TES-1025 at a target dose level of 5 mg/kg. Blood, brain and liver are collected at intervals up to 8 h after dose administration (n=3 animals per each time point). Phase 2: 3 mice receive each an intravenous administration of TES-1025 at a target dose of 0.5 mg/kg. Blood samples are collected from the lateral tail vein at intervals up to 24 h after dose administration. Phase 3: 3 mice receive a single intravenous administration of Elacridar (5 mg/kg) shortly before an oral administration of TES-1025 at a target dose of 5 mg/kg. Blood and brain samples are collected 0.5 h after dose administration. Brain, liver and kidney are collected from all animals of the study[1].

References:

[1]. Pellicciari R, et al. α-Amino-β-carboxymuconate-ε-semialdehyde Decarboxylase (ACMSD) Inhibitors as Novel Modulators of De Novo Nicotinamide Adenine Dinucleotide (NAD+) Biosynthesis. J Med Chem. 2018 Feb 8;61(3):745-759.