Volume 62, Issue 21 e202301598
Research Article

Hemin as a General Static Dark Quencher for Constructing Heme Oxygenase-1 Fluorescent Probes

Fan Chen

Fan Chen

State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000 China

These authors contributed equally to this work.

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Dr. Baoxin Zhang

Dr. Baoxin Zhang

State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000 China

These authors contributed equally to this work.

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Dr. Zhenjiang Ding

Dr. Zhenjiang Ding

State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000 China

Current address: Beijing Key Laboratory of the Innovative Development of Functional Staple and Nutritional Intervention for Chronic Diseases, China National Research Institute of Food and Fermentation Industries, Beijing, 100015 China

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Miao Zhong

Miao Zhong

State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000 China

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Dr. Yanan Hou

Dr. Yanan Hou

State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000 China

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Fang Zhang

Fang Zhang

State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000 China

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Dr. Guodong Hu

Dr. Guodong Hu

State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000 China

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Prof. Jianguo Fang

Corresponding Author

Prof. Jianguo Fang

School of Chemistry and Chemical Engineering, Nanjing University of Science & Technology, Nanjing, Jiangsu, 210094 China

State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000 China

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First published: 20 March 2023
Citations: 2

Graphical Abstract

Hemin was identified as a broad-spectrum (400–700 nm) and highly efficient (quenching efficiency >97 %) dark quencher for designing “turn-on” fluorescent probes. Based on this initial discovery, the first live cell-applicable fluorescent probe of heme oxygenase-1 (HO-1) was disclosed and a convenient fluoroassay was developed for determining HO-1 activity in biological samples.

Abstract

The development of small-molecule probes suitable for live-cell applications remains challenging yet highly desirable. We report the first fluorescent probe, RBH, for imaging the heme oxygenase-1 (HO-1) activity in live cells after discovering hemin as a universal dark quencher. Hemin works via a static quenching mechanism and shows high quenching efficiency (>97 %) with fluorophores across a broad spectrum (λex=400–700 nm). The favorable properties of RBH (e.g. long excitation/emission wavelengths, fast response rate and high magnitude of signal increase) enable its use for determining HO-1 activity in complex biological samples. As HO-1 is involved in regulating antioxidant defence, iron homeostasis and gasotransmitter carbon monoxide production, we expect RBH to be a powerful tool for dissecting its functions. Also, the discovery of hemin as a general static dark quencher provides a straightforward strategy for constructing novel fluorescent probes for diverse biological species.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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