PF-04620110

In Vitro Assay for DGAT-1 Enzyme Inhibition:

Human full-length diacylglycerol:acylCoA acyltransferase 1 (DGAT-1) was expressed in Sf9 insect cells which are then lysed and a crude membrane fraction (105, 000 x g pellet) was prepared. DGAT-1 activity was measured in 384-well format in a total assay volume of 25 μl that contained, Hepes buffer (50 mM, pH7.5), MgCl2 (10 mM), bovine serum albumin (0.6 mg/ml), [14C]decanoylCoA (20 μM, 58 Ci/mol) and membranes (25 μg/ml) into which 1,2 dioleoyl-sn-glycerol (75 μM) in acetone has already been incorporated. Inhibitors in DMSO were pre-incubated with membranes before initiating the DGAT-1 reaction by the addition of decanoylCoA.The reactions were allowed to proceed for 1.5 h at room temperature and then terminated by the addition of 10 μl of HCl (0.5 M). Reaction mixtures were neutralized by the addition of 15 μl of tris(hydroxy-methyl)aminomethane (1M, pH 8.0) and then mixed by trituration with 37.5 μl of Microscint-E . Plates contents were allowed to partition for 15 to 30 min before 14C was measured in a scintillation spectrometer. Percent inhibition of test compounds was computed as 100-(DPM DMSO uninhibited- DPM test compound)/(DPM DMSO uninhibited).

Cell lines

Human intestinal epithelial cells

Preparation method

Soluble in DMSO > 10 mM. General tips for obtaining a higher concentration: Please warm the tube at 37 ℃ for 10 minutes and/or shake it in the ultrasonic bath for a while. Stock solution can be stored below -20℃ for several months.

Reaction Conditions

5 hours at 37oC

Applications

PF-04620110 (IC50 39 nM) inhibits the incorporation of 3H-glycerol into TG.

Animal models

C57BL/6J and B6.129S4-Dgat1tm1Far (DGAT1 knockout mice) male mice (7–12 wk of age)

Dosage form

Oral dose of 1, 0.3, 0.1, and 0.01 mg/kg (TG/retinyl palmitate tolerance test)

Applications

Administration of a single dose of a DGAT1 inhibitor, PF-04620110, reduces postprandial plasma TG and retinyl palmitate excursions in mice.

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.

References:

1. Dow RL, Li JC, Pence MP, Gibbs EM, LaPerle JL, Litchfield J, Piotrowski DW, Munchhof MJ, Manion TB, Zavadoski WJ, Walker GS, McPherson RK, Tapley S, Sugarman E, Guzman-Perez A, DaSilva-Jardine P. Discovery of PF-04620110, a Potent, Selective, and Orally Bioavailable Inhibitor of DGAT-1. ACS Med Chem Lett. 2011 Mar 18;2(5):407-12.

2. Maciejewski BS, LaPerle JL, Chen D, Ghosh A, Zavadoski WJ, McDonald TS, Manion TB, Mather D, Patterson TA, Hanna M, Watkins S, Gibbs EM, Calle RA, Steppan CM. Pharmacological inhibition to examine the role of DGAT1 in dietary lipid absorption in rodents and humans. Am J Physiol Gastrointest Liver Physiol. 2013 Jun 1;304(11):G958-69.