2. Academic Validation
  3. Discovery of Selective Small Molecule Inhibitors of Monoacylglycerol Acyltransferase 3

Discovery of Selective Small Molecule Inhibitors of Monoacylglycerol Acyltransferase 3

  • J Med Chem. 2015 Sep 24;58(18):7164-72. doi: 10.1021/acs.jmedchem.5b01008.
Kim Huard 1 2,  Allyn T Londregan 1 2,  Gregory Tesz 1 2,  Kevin B Bahnck 1 2,  Thomas V Magee 1 2,  David Hepworth 1 2,  Jana Polivkova 1 2,  Steven B Coffey 1 2,  Brandon A Pabst 1 2,  James R Gosset 1 2,  Anu Nigam 1 2,  Kou Kou 1 2,  Hao Sun 1 2,  Kyuha Lee 1 2,  Michael Herr 1 2,  Markus Boehm 1 2,  Philip A Carpino 1 2,  Bryan Goodwin 1 2,  Christian Perreault 1 2,  Qifang Li 1 2,  Csilla C Jorgensen 1 2,  George T Tkalcevic 1 2,  Timothy A Subashi 1 2,  Kay Ahn 1 2
Affiliations

Affiliations

  • 1 Worldwide Medicinal Chemistry, ‡Cardiovascular, Metabolic and Endocrine Diseases Research Unit, and §Pharmacokinetics, Dynamics and Metabolism, Pfizer Worldwide Research & Development , Cambridge, Massachusetts 02139, United States.
  • 2 Worldwide Medicinal Chemistry, ∥Pharmacokinetics, Dynamics and Metabolism, Pfizer Worldwide Research & Development , Groton, Connecticut 06340, United States.
PMID: 26258602 DOI: 10.1021/acs.jmedchem.5b01008
Abstract

Inhibition of triacylglycerol (TAG) biosynthetic Enzymes has been suggested as a promising strategy to treat Insulin resistance, diabetes, dyslipidemia, and hepatic steatosis. Monoacylglycerol Acyltransferase 3 (MGAT3) is an integral membrane Enzyme that catalyzes the acylation of both monoacylglycerol (MAG) and diacylglycerol (DAG) to generate DAG and TAG, respectively. Herein, we report the discovery and characterization of the first selective small molecule inhibitors of MGAT3. Isoindoline-5-sulfonamide (6f, PF-06471553) selectively inhibits MGAT3 with high in vitro potency and cell efficacy. Because the gene encoding MGAT3 (MOGAT3) is found only in higher mammals and humans, but not in rodents, a transgenic mouse model expressing the complete human MOGAT3 was used to characterize the effects of 6f in vivo. In the presence of a combination of diacylglycerol acyltransferases 1 and 2 (DGAT1 and DGAT2) inhibitors, an oral administration of 6f exhibited inhibition of the incorporation of deuterium-labeled glycerol into TAG in this mouse model. The availability of a potent and selective chemical tool and a humanized mouse model described in this report should facilitate further dissection of the physiological function of MGAT3 and its role in lipid homeostasis.

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