MK-8617

Kinase experiment:

The catalytic activity assays for the HIF-PHD isoforms are performed at subsaturating levels of 2-oxoglutarate. To each well of a 96-well plate are added 1 μL of MK-8617 in DMSO and 20 μL of assay buffer containing 0.15 μg/mL FLAG-tagged full length HIF-PHD isoform expressed in and purified from baculovirus-infected Sf9 cells. After a 30 min preincubation at room temperature, the enzymatic reactions are initiated by the addition of 4 μL of substrates. After 2 h at room temperature, the reactions are terminated and signals are developed by the addition of a 25 μL quench/detection mix to a final concentration of 1 mM ortho-phenanthroline, 0.1 mM EDTA, 0.5 nM anti-(His)6 LANCE reagent, 100 nM AF647-labeled streptavidin, and 2 μg/mL (His)6-VHL complex. The ratio of time-resolved fluorescence signals at 665 and 620 nm is determined, and percent inhibition is calculated relative to an uninhibited control sample run in parallel[1].

Animal experiment:

Male Sprague-Dawley rats (approximately 300 g each, n=15/arm) are dosed once daily for 28 days with vehicle (25:75 v/v PEG200/water+1 mol equiv of NaOH) or MK-8617 (1.5 or 15 mg/kg in vehicle). A group of age-matched, untreated controls (n=15) are included in the experiment. On study days 3, 14, and 28, blood samples (~0.25 mL) are obtained via jugular venipuncture and on study day 36 by cardiocentesis for hematological and MK-8617 level analyses[1].

References:

[1]. Debenham JS, et al. Discovery of N-[Bis(4-methoxyphenyl)methyl]-4-hydroxy-2-(pyridazin-3-yl)pyrimidine-5-carboxamide (MK-8617), an Orally Active Pan-Inhibitor of Hypoxia-Inducible Factor Prolyl Hydroxylase 1-3 (HIF PHD1-3) for the Treatment of Anemia. J Med Chem. 2016 Dec 22;59(24):11039-11049.