Volume 58, Issue 8 pp. 2377-2381
Communication

A Noncovalent Fluorescence Turn-on Strategy for Hypoxia Imaging

Wen-Chao Geng

Wen-Chao Geng

College of Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071 China

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Shaorui Jia

Shaorui Jia

Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071 China

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Zhe Zheng

Zhe Zheng

College of Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071 China

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Zhihao Li

Zhihao Li

College of Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071 China

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Prof. Dan Ding

Prof. Dan Ding

Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071 China

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Prof. Dong-Sheng Guo

Corresponding Author

Prof. Dong-Sheng Guo

College of Chemistry, Key Laboratory of Functional Polymer Materials (Ministry of Education), State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071 China

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First published: 10 January 2019
Citations: 147

Dedicated to Professor Yu Liu on the occasion of his 65th birthday

Graphical Abstract

A supramolecular strategy for fluorescent hypoxia imaging is proposed based on the host–guest complexation of azomacrocycles with commercial dyes.

Abstract

Hypoxia plays crucial roles in many diseases and is a central target for them. Present hypoxia imaging is restricted to the covalent approach, which needs tedious synthesis. In this work, a new supramolecular host–guest approach, based on the complexation of a hypoxia-responsive macrocycle with a commercial dye, is proposed. To exemplify the strategy, a carboxyl-modified azocalix[4]arene (CAC4A) was designed that binds to rhodamine 123 (Rho123) and quenches its fluorescence. The azo groups of CAC4A were selectively reduced under hypoxia, leading to the release of Rho123 and recovery of its fluorescence. The noncovalent strategy was validated through hypoxia imaging in living cells treated with the CAC4A–Rho123 reporter pair.

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