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A Comprehensive Review of Soluble Epoxide Hyadrolase Inhibitors Evaluating their Structure-Activity Relationship

Journal

MINI-REVIEWS IN MEDICINAL CHEMISTRY
Volume 23, Issue 1, Pages 99-117

Publisher

BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/1389557522666220531152812

Keywords

Adamantyl amide-based inhibitors; disubstituted urea; SAR; soluble epoxide hydrolase; pharmacophores; arachidonic acid

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Soluble epoxide hydrolase is an enzyme that exists in various organs and tissues and is responsible for degrading epoxyeicosatrienoic acids. Inhibiting this enzyme is a potential strategy for the treatment of renal and cardiovascular diseases, inflammation, and pain. Developing novel inhibitors for soluble epoxide hydrolase has been a popular research topic, but there are challenges such as rapid metabolism and weak pharmacokinetic characteristics.
Soluble epoxide hydrolase is a class of alpha/beta-fold hydrolase enzymes that exist in numerous organs and tissues, including the liver, kidney, brain, and vasculature. This homodimer enzyme is responsible for degrading epoxyeicosatrienoic acids to the less active vicinal diols, dihydroxyeicosatrienoic acids by adding a molecule of water to an epoxide in the cytochrome P450 pathway. Soluble epoxide hydrolase was firstly assayed and characterized by Hammock and colleagues about 40 years ago. Upholding high epoxyeicosatrienoic acid blood levels by inhibiting soluble epoxide hydrolase has been proposed as a hopeful strategy to treat renal and cardiovascular diseases, inflammation, and pain. Therefore, developing novel soluble epoxide hydrolase inhibitors has been an attractive research topic for many years. Regarding this issue, some carbamates, heterocycles, amides, and ureas have been proposed; however, rapid metabolism, low solubility, high melting point, and weak pharmacokinetic characteristics are challenges posed to the researchers. In this review, we have focused on the role of the soluble epoxide hydrolase in the metabolic pathway of arachidonic acid, and categorized the most representative soluble epoxide hydrolase inhibitors into two main classes of synthetic and natural compounds. The structures have been evaluated and an exemplary structure-activity relationship has been provided for further development of potent inhibitors at the end. According to our findings, urea-based inhibitors were preferred to the amide-based scaffolds due to the better fitting into the active site. An aromatic linker is a suitable bridge to connect primary and secondary pharmacophores compared with aliphatic linkers.

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