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Related Experiment Videos

Calcium binding by gadolinium-based MR contrast agents.

Katsumi Hayakawa1, Tatsuo Nakamura, Yasuhiko Shimizu

  • 1Department of Radiology, Kyoto City Hospital, Nakagyo-ku, Kyoto 604-8845, Japan.

Radiation Medicine
|March 25, 2006
PubMed
Summary
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Gadolinium-based MR contrast agents can alter ionic calcium levels. Ionic gadolinium compounds significantly reduced calcium ions in vitro compared to non-ionic agents.

Area of Science:

  • Medical Imaging
  • Radiochemistry
  • Biochemistry

Background:

  • Gadolinium-based contrast agents (GBCAs) are widely used in Magnetic Resonance Imaging (MRI).
  • Understanding their potential interactions with endogenous ions is crucial for safety assessment.
  • Ionic and non-ionic GBCAs exhibit different chemical properties that may influence biological systems.

Purpose of the Study:

  • To investigate the effects of various gadolinium-based contrast agents on ionic sodium, potassium, and calcium levels.
  • To compare the alterations induced by different types of GBCAs, including ionic and non-ionic compounds.
  • To quantify the calcium-binding capacities of these agents.

Main Methods:

  • An electrolyte solution with defined concentrations of calcium, sodium, and potassium was prepared.

Related Experiment Videos

  • Various gadolinium compounds (Gd-DTPA, Gd-DOTA, gadoteridol, gadodiamide) and meglumine/sodium diatrizoate were diluted with the electrolyte solution.
  • Alterations in ionized electrolytes were measured using an ion-specific electrometer across a range of dilutions (5% to 100%).

    • Main Results:

    • Alterations in ionic sodium and potassium levels were comparable between gadolinium compounds and isotonic saline.
    • A significant reduction in ionized calcium was observed with Gd-DTPA and Gd-DOTA.
    • Gd-DTPA and Gd-DOTA showed a greater reduction in ionized calcium compared to gadoteridol and gadodiamide.

    Conclusions:

    • Ionic gadolinium compounds, specifically Gd-DTPA and Gd-DOTA, significantly reduced ionized calcium levels in vitro.
    • Non-ionic gadolinium compounds (gadoteridol, gadodiamide) exhibited less impact on ionized calcium.
    • These findings highlight differential effects of GBCAs on calcium homeostasis, warranting further investigation.