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A Novel pH-Sensitive MRI Contrast Agent.

Zhang1, Wu, Sherry

  • 1Department of Chemistry, University of Texas at Dallas, P.O. Box 830688, Richardson TX 75083-0688 (USA) (and) The Rogers Magnetic Resonance Center, Department of Radiology, University of Texas Southwestern Medical Center, 5801 Forest Park Road, Dallas, TX 75235-9085 (USA).

Angewandte Chemie (International Ed. in English)
|November 11, 1999
PubMed
Summary
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This study details a gadolinium(III) complex with unique phosphonate groups. Its water proton relaxivity is pH-dependent, enhancing MRI contrast below pH 7.

Area of Science:

  • Inorganic Chemistry
  • Radiochemistry
  • Magnetic Resonance Imaging

Background:

  • Gadolinium(III) complexes are crucial as contrast agents in Magnetic Resonance Imaging (MRI).
  • Developing novel ligands is key to improving relaxivity and targeting specific physiological conditions.
  • Understanding water molecule exchange dynamics is vital for optimizing MRI contrast agent performance.

Purpose of the Study:

  • To synthesize and characterize a novel tetrasubstituted 1,4,7,10-tetraazacyclododecane derivative complex with gadolinium(III).
  • To investigate the pH-dependent water proton relaxivity of the gadolinium(III) complex.
  • To elucidate the mechanism behind pH-dependent relaxivity and its implications for MRI contrast enhancement.

Main Methods:

  • Synthesis of a tetrasubstituted 1,4,7,10-tetraazacyclododecane ligand with amide and phosphonate coordinating groups.

Related Experiment Videos

  • Complexation of the ligand with gadolinium(III).
  • Relaxivity measurements at 20 MHz across a range of pH values.
  • Analysis of water molecule exchange dynamics (tau(M)) using nuclear magnetic resonance (NMR) spectroscopy.

    • Main Results:

    • Formation of a stable gadolinium(III) complex featuring amide coordinating groups and extended noncoordinating phosphonate groups.
    • The complex exhibits a slowly exchanging inner-sphere water molecule with a residence time (tau(M)) of 21 µs.
    • Water proton relaxivity demonstrated significant pH dependence.
    • Below pH 7, protonation of phosphonate groups catalyzed prototropic exchange, enhancing water contrast.

    Conclusions:

    • The novel gadolinium(III) complex displays pH-sensitive relaxivity, offering potential for targeted MRI contrast enhancement.
    • Protonation of phosphonate groups is identified as a key mechanism for modulating water exchange and MRI contrast.
    • This finding opens avenues for developing responsive MRI contrast agents for specific biological environments.