Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (8): 20230140.doi: 10.7503/cjcu20230140

• Analytical Chemistry • Previous Articles     Next Articles

Visualization of Protein-specific Glycosylation and Photodynamic Therapy via an Enzyme-free Amplification Strategy of Catalytic Hairpin Assembly and Hybridization Chain Reaction

LI Ting, XING Simin, LIU Yang()   

  1. Department of Chemistry,Beijing Key Laboratory for Analytical Methods and Instrumentation,Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology,Ministry of Education,Tsinghua University,Beijing 100084,China
  • Received:2023-03-29 Online:2023-08-10 Published:2023-05-08
  • Contact: LIU Yang E-mail:liu-yang@mail.tsinghua.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22174084)

Abstract:

Herein, a highly sensitive, enzyme-free signal amplification strategy based on the proximity-induced catalytic hairpin assembly and hybridization chain reaction(CHA-HCR) was developed for protein-specific glycosy-lation fluorescence imaging of cancer cells in situ and highly efficient photodynamic therapy. Two DNA probes were designed for the specific labeling of target proteins and glycans, respectively, where the protein probe(PP) identified the MUC1 protein by aptamer and the glycan probe(GP) specifically bound to sialic acid via bioorthogonal reaction. Due to the proximity effect, the CHA initiation sequence in the PP hybridized with the adjacent GPs and triggered a subsequent CHA-HCR cascade reaction. An extended double-stranded DNA strand with multiple fluorescent molecules or photosensitizers formed on specific glycosylation of the target protein, which provided a universal avenue for the multiple glycosylation imaging on the cancer cell surface with high sensitivity and a valuable way for photodynamic therapy with enhanced cytotoxic effect by targeting the specific glycoproteins. This strategy supplies the reference for uncovering the mechanism of glycosylation, screening glycan-related biomarkers and developing targeted therapies.

Key words: Proximity, Bioorthogonal reaction, Enzyme-free signal amplification, Glycosylation imaging, Photo- dynamic therapy

CLC Number: 

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