Volume 62, Issue 38 e202309768
Research Article

“Dual-Key-and-Lock” NIR-II NSCyanines Enable High-Contrast Activatable Phototheranostics in Extrahepatic Diseases

Yang Tian

Yang Tian

Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, 300071 Tianjin, China

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Zhaoming Chen

Zhaoming Chen

Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, 300071 Tianjin, China

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Senyao Liu

Senyao Liu

Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, 300071 Tianjin, China

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Fapu Wu

Fapu Wu

Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, 300071 Tianjin, China

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Wenwen Cao

Wenwen Cao

Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, 300071 Tianjin, China

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Prof. Dai-Wen Pang

Corresponding Author

Prof. Dai-Wen Pang

Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, 300071 Tianjin, China

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Prof. Hu Xiong

Corresponding Author

Prof. Hu Xiong

Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 94 Weijin Road, 300071 Tianjin, China

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First published: 09 August 2023
Citations: 15

Graphical Abstract

“Dual-key-and-lock” NIR-II NSCyanine dyes have been developed by harnessing a non-symmetric strategy, which enables activatable liver imaging and therapy with high signal-to-background ratio in extrahepatic diseases, including metastasis-imaging, acute gastritis-imaging, bacteria infected wound healing, and tumor ablation via combined photothermal therapy and chemotherapy.

Abstract

Conventional cyanine dyes with a symmetric structure are “always-on”, which can easily accumulate in the liver and display high liver background fluorescence, inevitably interfering the accurate diagnosis and therapy in extrahepatic diseases. We herein report a platform of NIR-II non-symmetric cyanine (NSCyanine) dyes by harnessing a non-symmetric strategy, which are extremely sensitive to pH/viscosity and can be activated via a “dual-key-and-lock” strategy. These NSCyanine dyes with a low pKa (<4.0) only show weak fluorescence at lysosome pH (key1), however, the fluorescence can be completely switched on and significantly enhanced by intracellular viscosity (key2) in disease tissues, exhibiting high target-to-liver ratios up to 19.5/1. Notably, high-contrast phototheranostics in extrahepatic diseases are achieved, including intestinal metastasis-imaging, acute gastritis-imaging, bacteria infected wound healing, and tumor ablation via targeted combined photothermal therapy and chemotherapy.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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