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Advances in Bile Acid Medicinal Chemistry

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Bile acids (BAs) are a family of steroidal molecules derived from cholesterol and biosynthesised in the pericentral hepatocytes of the liver. Structurally they may be regarded as consisting of two components, a rigid steroid nucleus and a short aliphatic side chain terminating in an alcohol or carboxyl group.

Traditionally BAs are known for their ability to act as solubilising agents in the gut, aiding in the absorption of dietary lipids through the formation of mixed micelles. However the identification of BAs as ligands of the farnesoid X receptor (FXR) has lead to the realisation that these molecules have a wider range of biological effects.

BAs regulate lipid and glucose homeostasis through activation of the FXR and the G-protein coupled receptor, TGR5. They can activate apoptotic, inflammatory and carcinogenic signalling pathways. BAs have also been shown to have anti-inflammatory effects. Interestingly, BAs are not restricted to the hepatic-intestinal system. Plasma BAs regulate BA synthesis and metabolism. BAs have recently been identified in cerebrospinal fluid. The BA, ursodeoxycholic acid has a potential role as a neuroprotectant in Huntington's disease and its taurine conjugate exhibits neuro-protective effects in vitro that may be relevant to Alzheimer's disease.

This renaissance in BA biology has lead to the development of numerous medicinal chemistry programmes with different therapeutic targets, using BAs as lead structures. BA derivatives with increased efficacy and potency for FXR and TGR5 hold significant promise for the treatment of metabolic disorders. The peculiar effects of BAs on cell viability have been exploited for the design of selective cytocidal agents for treatment of various cancers. BA derivatives have also been screened with much success for anti-microbial and antifungal properties. Other targets include carbonic anhydrase for treatment of glaucoma and the glucocorticoid receptor for antiinflammatory effects.

In this review interesting recent developments in the medicinal chemistry of these eclectic substances will be discussed.
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Keywords: Anti-microbials; TGR5; bile acid; bile acid conjugates; carbonic anhydrase; cytotoxics; farnesoid X receptor; nuclear receptors; prodrug

Document Type: Research Article

Publication date: September 1, 2011

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  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.
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