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Transcript
Poster No. 48
Title:
Design and Synthesis of Small Molecule Inhibitors of Endothelial Lipase, an HDL Regulating Drug Target
Authors:
Daniel O'Connell and William Bachovchin
Presented by:
Daniel O'Connell
Department(s):
Department of Biochemistry, Tufts University School of Medicine
Abstract:
Endothelial Lipase (EL) is a recently discovered member of the triglyceride lipase gene family whose activity is
negatively correlated with levels of HDL-cholesterol in vivo. Disruption of EL activity, either through antibody
directed inhibition, or gene knock-out, has been shown to increase levels of HDL-C in rabbits and mice on both
normal and high-fat diets. Because the active site of EL contains serine-protease like achitecture, we
hypothesized that boronic acids could be used as small molecule inhibitors. Indeed, several aliphatic and
arylboronic acids have been synthesized and screened against EL and its highly homologous family member,
lipoprotein lipase (LPL). Since our initial screens, we have synthesized rationally designed derivatives of
phenylboronic acid. The best of these compounds shows IC50 = 1µM, while also being 42-fold more selective
for EL than LPL. The next generation of compounds will incorporate negatively charged moieties into these
inhibitors in an attempt to capitalize on the preference of EL for phospholipids. These syntheses will take
advantage of a newly developed synthetic scheme that incorporates significant recent advances of the Suzuki
coupling. It is our hope that these inhibitors could be used as novel therapeutics to raise HDL-cholesterol levels.
50