Volume 61, Issue 31 e202205436
Research Article

Mild Acidosis-Directed Signal Amplification in Tumor Microenvironment via Spatioselective Recruitment of DNA Amplifiers

Dr. Zhenghan Di

Dr. Zhenghan Di

CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190 China

College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, 100049 China

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Prof. Dr. Xueguang Lu

Prof. Dr. Xueguang Lu

Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 China

David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139 USA

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Dr. Jian Zhao

Dr. Jian Zhao

CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190 China

College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, 100049 China

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Prof. Ana Jaklenec

Prof. Ana Jaklenec

David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139 USA

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Prof. Yuliang Zhao

Prof. Yuliang Zhao

CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190 China

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Prof. Robert Langer

Prof. Robert Langer

David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139 USA

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Prof. Lele Li

Corresponding Author

Prof. Lele Li

CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190 China

College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, 100049 China

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First published: 01 June 2022
Citations: 25

Graphical Abstract

A DNA-based strategy is developed for spatially-selective amplification of acidic signals in the extracellular milieu of tumors. Amplified imaging of the tumor microenvironment with improved sensitivity was achieved by acidity-responsive engineering of the cell surface with DNA receptors for controlled recruitment of fluorescent amplifiers.

Abstract

DNA biotechnology offers intriguing opportunities for amplification-based sensitive detection. However, spatiotemporally-controlled manipulation of signal amplification for in situ imaging of the tumor microenvironment remains an outstanding challenge. Here, we demonstrate a DNA-based strategy that can spatial-selectively amplify the acidic signal in the extracellular milieu of the tumor to achieve specific imaging with improved sensitivity. The strategy, termed mild acidosis-targeted amplification (MAT-amp), leverages the specific acidic microenvironment to engineer tumor cells with artificial DNA receptors through a pH (low) insertion peptide, which permits controlled recruitment of fluorescent amplifiers via a hybridization chain reaction. The acidosis-responsive amplification cascade enables significant fluorescence enhancement in tumors with a reduced background signal in normal tissues, leading to improved signal-to-background ratio. These results highlight the utility of MAT-amp for in situ imaging of the microenvironment characterized by pH disequilibrium.

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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