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A DNA-Programmed Potassium Ion Magnetic Resonance Sensor.

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Summary
This summary is machine-generated.

Researchers developed a novel potassium-activated magnetic resonance sensor (KMRS) for in vivo potassium mapping. This breakthrough enables deep-tissue visualization of pathological potassium levels, aiding in early cancer detection.

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Area of Science:

  • Biomedical Engineering
  • Molecular Imaging
  • Nanotechnology

Background:

  • Disrupted potassium (K+) homeostasis is linked to altered membrane potential, electrolyte imbalance, and cancer.
  • Existing optical sensors lack the necessary depth for in vivo tissue imaging.
  • Current magnetic resonance imaging (MRI) lacks K+-selective contrast agents.

Purpose of the Study:

  • To develop a K+-activated magnetic resonance sensor (KMRS) for in vivo K+ mapping.
  • To enable deep-tissue visualization of pathological K+ elevations.
  • To establish a generalizable framework for ion-responsive MRI probes.

Main Methods:

  • Designed a KMRS linking a Gd-DOTA reporter to an iron oxide (IO) quencher via a K+-selective DNA linker.
  • Utilized G-quadruplex folding to control magnetic relaxation based on K+ concentration.
  • Investigated K+-dependent modulation of longitudinal relaxivity (r1) in vitro and in vivo.

    • Main Results:

    • KMRS demonstrated K+-dependent modulation of relaxivity, with increased r1 in high K+ conditions.
    • The sensor enabled deep-tissue visualization of pathological K+ elevations.
    • Successfully discriminated between tumor and benign tissues based on ion levels.

    Conclusions:

    • The KMRS provides a novel approach for noninvasive, K+-selective MRI.
    • This technology supports early detection of malignant foci and ion-based tissue discrimination.
    • The KMRS design offers a versatile platform for engineering other ion-responsive MRI probes.