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Click chemistry-based imaging to study the tissue distribution of the curcumin–protein complex in mice

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Abstract

Previous studies have shown that curcumin, a bioactive dietary compound with a thiol-reactive α,β-unsaturated carbonyl moiety, can covalently modify protein thiols. However, most of the previous studies were performed in cultured cells or cell-free enzyme systems, and so it remains unknown whether curcumin could covalently modify proteins after oral administration in vivo. Using click chemistry-based fluorescence imaging, here we show that oral administration of dialkyne-curcumin (Di-Cur), a “click” probe mimicking curcumin, results in covalent modifications of cellular proteins in colon and liver tissues, but not in other tissues, in mice. This result suggests that oral administration of curcumin leads to the formation of the curcumin–protein complex in a tissue-specific manner, which could contribute to the biological effects and/or pharmacokinetics of curcumin. Further studies to elucidate the identities of curcumin-binding proteins could greatly help us to better understand the molecular mechanisms of curcumin, and develop novel strategies for disease prevention.

Graphical abstract: Click chemistry-based imaging to study the tissue distribution of the curcumin–protein complex in mice

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Supplementary files

Article information


Submitted
30 Aug 2019
Accepted
27 Jan 2020
First published
30 Jan 2020

Food Funct., 2020, Advance Article
Article type
Paper

Click chemistry-based imaging to study the tissue distribution of the curcumin–protein complex in mice

J. Zhou, W. Wang, J. Zhang, Z. Du, H. Yang and G. Zhang, Food Funct., 2020, Advance Article , DOI: 10.1039/C9FO02012H

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