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In vivo 19F MRI for Cell Tracking
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A Fluorinated Ionic Liquid-Based Activatable 19F MRI Platform Detects Biological Targets.

Xianglong Zhu1,2, Xiaoxue Tang1, Hongyu Lin1

  • 1Department of Chemical Biology, State Key Laboratory of Physical Chemistry of Solid Surfaces, The MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

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Researchers developed a novel fluorinated ionic liquid-based activatable 19F MRI platform (FILAMP). This system enhances 19F MRI signals in response to biological stimuli, enabling sensitive detection of disease markers.

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Area of Science:

  • Biomedical Engineering
  • Molecular Imaging
  • Nanotechnology

Background:

  • 19F magnetic resonance imaging (19F MRI) offers advantages for in vivo molecular imaging due to its negligible background signal and deep tissue penetration.
  • Developing 19F probes with adequate water solubility and responsive functionalities for practical bioimaging applications remains a significant challenge.

Purpose of the Study:

  • To introduce fluorinated ion liquids (ILs) as novel fluorine agents for 19F MRI.
  • To develop a fluorinated ionic liquid-based activatable 19F MRI platform (FILAMP) for responsive molecular imaging.

Main Methods:

  • Synthesized fluorinated ion liquids (ILs) as the core fluorine agents.
  • Constructed FILAMP by encapsulating ILs within a dissolvable or degradable polymer coating.
  • Investigated FILAMP's phase transition triggered by environmental stimuli for signal enhancement.
  • Validated FILAMP's 'turn-on' 19F MRI response for detecting biological targets in cellular and animal models.

Main Results:

  • Demonstrated that FILAMP releases fluorinated ILs upon environmental stimulation, leading to a rapid and significant enhancement of the 19F MRI signal.
  • Successfully detected biological targets, including dysregulated pH and matrix metalloproteinase (MMP) overexpression, at the cellular level.
  • Verified the platform's efficacy in vivo in mouse models, showcasing its potential for pathological process monitoring.

Conclusions:

  • Fluorinated ion liquids represent a promising new class of agents for 19F MRI applications.
  • The FILAMP platform provides a robust, activatable 19F probe with a 'turn-on' response for enhanced molecular imaging.
  • FILAMP holds significant potential for the diagnosis and monitoring of various biological and pathological processes.