Chinese Journal of Magnetic Resonance ›› 2021, Vol. 38 ›› Issue (3): 336-344.doi: 10.11938/cjmr20202828

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Cathepsin B Triggered Hyperpolarization 129Xe MRI Probe for Ultra-Sensitive Lung Cancer Cells Detection

Chong-wu WANG1,2,Xi HUANG1,Lei SHI1,Shi-zhen CHEN1,Xin ZHOU1,*()   

  1. 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan(Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences), Wuhan 430071, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-04-25 Online:2021-09-05 Published:2020-05-14
  • Contact: Xin ZHOU E-mail:xinzhou@wipm.ac.cn

Abstract:

Cathepsin B (Cat B) is a lysosomal cysteine protease that plays an essential role in cellular metabolism. Cat B is overexpressed in lung cancer cells. Fluorescence imaging techniques have been developed for measuring intracellular Cat B levels, which, however, suffers from limited penetration depth and interferences from autofluorescence background. To resolve these technical difficulties, we designed a novel Cat B biosensor detected by hyperpolarized xenon magnetic resonance imaging. It consists of a cryptophane cage as a 129Xe NMR reporter and an amide bond as a Cat B-specific cleavable group. When the biosensor interacts with Cat B, the cleavage of amide bond leads to changes in 129Xe chemical shift. Combing with hyperpolarization-chemical exchange saturation transfer (Hyper-CEST), our biosensor provides a novel method for responsive detection of Cat B.

Key words: nuclear magnetic resonance (NMR), contrast agents, lung cancer, hyperpolarization 129Xe MRI probe, cathepsin B, chemical exchange saturation transfer (CEST)

CLC Number: