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Zn(II)-Responsive MRI Probe Based on an Fe(III) Macrocyclic Complex.

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Researchers developed a novel iron(III) MRI contrast agent, Fe(ADAPT), that is responsive to zinc(II) ions. This new probe shows significant relaxivity increases in the presence of zinc, aiding in potential diagnostic applications.

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Area of Science:

  • Inorganic Chemistry
  • Biomedical Imaging
  • Materials Science

Background:

  • Responsive MRI contrast agents are crucial for detecting biological analyte fluctuations.
  • Zinc(II) plays vital roles in biological processes, making its detection important.
  • Iron(III) complexes offer potential as MRI contrast agents due to their magnetic properties.

Purpose of the Study:

  • To develop and characterize a novel high-spin iron(III) coordination complex, Fe(ADAPT), as an MRI contrast agent responsive to zinc(II).
  • To evaluate the kinetic inertness and relaxivity changes of Fe(ADAPT) in the presence of zinc(II) under physiological conditions.

Main Methods:

  • Synthesis and characterization of the Fe(ADAPT) complex with a phenolate-appended 1,4,7-triazacyclononane (TACN) ligand.
  • Relaxivity measurements of the Fe(III) probe in the presence and absence of varying concentrations of Zn(II).
  • Assessment of kinetic inertness at physiological pH and temperature.

Main Results:

  • Fe(ADAPT) is a kinetically inert six-coordinate Fe(III) complex that relies on outer-sphere water for proton relaxation.
  • An 80% increase in relaxivity was observed with 2 equiv of Zn(II) at 200 μM Fe(III) probe concentration.
  • A ternary complex with human serum albumin and Zn(II) resulted in a nearly 200% increase in relaxivity.

Conclusions:

  • Fe(ADAPT) represents one of the first Fe(III) MRI probes demonstrating responsiveness to Zn(II).
  • The probe exhibits significant relaxivity enhancement upon Zn(II) binding, indicating its potential for diagnostic imaging.
  • The inert nature and sensitivity to Zn(II) make Fe(ADAPT) a promising candidate for developing advanced MRI contrast agents.