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A Neutral and Stable Macrocyclic Mn(II) Complex for MRI Tumor Visualization.

Loredana Leone1, Annasofia Anemone2, Antonella Carella3

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|October 5, 2022
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Summary

A novel manganese(II) complex shows promise as a magnetic resonance imaging (MRI) contrast agent. It demonstrates effective tumor enhancement in mice, comparable to existing gadolinium agents, with favorable biodistribution.

Keywords:
MRIManganesecontrast agentrelaxometrytumor

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Area of Science:

  • Inorganic Chemistry
  • Radiochemistry
  • Biomedical Imaging

Background:

  • Development of safe and effective MRI contrast agents is crucial for diagnostic imaging.
  • Gadolinium-based contrast agents face concerns regarding long-term toxicity and retention.
  • Manganese(II) complexes offer a potential alternative with different biological interactions and elimination pathways.

Purpose of the Study:

  • To synthesize and characterize a stable, inert amphiphilic manganese(II) complex.
  • To evaluate the relaxometric properties of the Mn(II) complex and its interaction with human serum albumin (HSA).
  • To assess the in vivo performance of the Mn(II) complex as an MRI contrast agent in a murine tumor model.

Main Methods:

  • Synthesis and characterization of a Mn(II) complex based on a bisamide derivative of 1,4-DO2A.
  • 1H NMR relaxometry to study the complex's behavior under varying magnetic field strength, pH, and temperature.
  • In vivo biodistribution studies and MRI in healthy mice and a breast tumor murine model.
  • Comparison of tumor contrast enhancement with a clinically approved Gd(III) agent (GdBOPTA).

Main Results:

  • The synthesized Mn(II) complex exhibited stable and inert properties.
  • Significant relaxivity enhancement was observed upon interaction with HSA, particularly at low magnetic fields.
  • In vivo studies showed rapid renal/liver elimination without spleen accumulation in healthy mice.
  • The Mn(II) agent provided comparable tumor contrast enhancement to GdBOPTA up to 3 hours post-injection in a breast tumor model.

Conclusions:

  • The developed amphiphilic Mn(II) complex is a promising candidate for MRI contrast agents.
  • Its favorable relaxivity, biodistribution, and comparable tumor enhancement suggest potential clinical utility.
  • This Mn(II) complex represents a viable alternative to gadolinium-based agents, potentially mitigating toxicity concerns.