Synthesis of Lithocholic Acid Derivatives as Proteasome Regulators.
Accumulation of aberrant protein aggregates, such as amyloid beta peptide (Aβ), due to decreased proteasome activities might contribute to the neurodegeneration in Alzheimer's disease. In this study, lithocholic acid derivatives 3α-O-pimeloyl-lithocholic acid methyl ester (2) and its isosteric isomer (6) were found to activate the chymotrypsin-like activity of the proteasome at an EC(50) of 7.8 and 4.3 μM, respectively. Replacing the C24 methyl ester in 2 with methylamide resulted in a complete devoid of proteasome activating activity. Epimerizing the C3 substituent from an alpha to beta orientation transformed the activator into a proteasome inhibitor. Unlike the cellular proteasome activator PA28, proteasome activated by 2 was not inhibited by Aβ. Furthermore, 2 potently antagonized the inhibitory effect of Aβ on the proteasome. In summary, compound 2 represents a novel class of small molecules that not only activates the proteasome but also antagonizes the inhibitory effect of Aβ on the proteasome.
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- 3405 Organic chemistry
- 3404 Medicinal and biomolecular chemistry
- 1115 Pharmacology and Pharmaceutical Sciences
- 0305 Organic Chemistry
- 0304 Medicinal and Biomolecular Chemistry
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- 3405 Organic chemistry
- 3404 Medicinal and biomolecular chemistry
- 1115 Pharmacology and Pharmaceutical Sciences
- 0305 Organic Chemistry
- 0304 Medicinal and Biomolecular Chemistry