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Mn2+ Bispidine Complex Combining Exceptional Stability, Inertness, and MRI Efficiency.

Daouda Ndiaye1, Patrick Cieslik2, Hubert Wadepohl2

  • 1Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, 45071 Orléans, France.

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|November 29, 2022
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Summary
This summary is machine-generated.

A novel manganese (Mn2+) complex, MnL3, demonstrates excellent stability, selectivity, and kinetic inertness, making it a promising alternative to gadolinium (Gd3+) for magnetic resonance imaging (MRI) contrast agents.

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Area of Science:

  • Inorganic Chemistry
  • Radiochemistry
  • Materials Science

Background:

  • Manganese (Mn2+) is a potential MRI contrast agent, but requires stable and inert complexation to replace gadolinium (Gd3+).
  • Developing safe and effective MRI contrast agents is crucial for diagnostic imaging.

Purpose of the Study:

  • To synthesize and characterize a novel manganese complex, MnL3, for MRI applications.
  • To evaluate the stability, selectivity, kinetic inertness, and relaxivity of MnL3.
  • To assess the *in vivo* performance of MnL3 as an MRI contrast agent.

Main Methods:

  • Synthesis of the ligand L3 with pyridine and carboxylate pendants on a bispidine platform.
  • Characterization using X-ray crystallography and 17O NMR spectroscopy.
  • Measurement of thermodynamic stability, kinetic inertness, and water proton relaxivity.
  • *In vivo* MRI experiments in mice.

Main Results:

  • The ligand L3 forms a highly stable (log KMnL = 19.47) and selective complex with Mn2+.
  • MnL3 exhibits remarkable kinetic inertness and a favorable eight-coordinate structure.
  • The complex shows high water proton relaxivity (r1 = 4.44 mM-1 s-1) and efficient renal clearance *in vivo*.
  • MnL3 provides significant signal enhancement in kidney MRI.

Conclusions:

  • MnL3 is the first manganese chelate to combine high stability, selectivity, inertness, and excellent relaxation properties for MRI.
  • This novel complex shows significant promise as a safe and effective alternative to Gd3+-based MRI contrast agents.
  • Further research may lead to clinical applications of MnL3 in diagnostic imaging.