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Related Experiment Videos

Gd-DOTA: characterization of a new paramagnetic complex.

J C Bousquet1, S Saini, D D Stark

  • 1Department of Radiology, Massachusetts General Hospital, Boston 02114.

Radiology
|March 1, 1988
PubMed
Summary

Gadolinium-tetraazacyclododecanetetraacetic acid (Gd-DOTA) shows superior in vitro stability and in vivo safety compared to Gd-DTPA. Its enhanced stability suggests improved safety for MRI contrast agents.

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Area of Science:

  • Magnetic Resonance Imaging (MRI) contrast agents
  • Radiochemistry
  • Toxicology

Background:

  • Gadolinium-based contrast agents (GBCAs) are essential for MRI.
  • In vitro stability is crucial for GBCA safety.
  • Cyclic GBCAs offer potential safety advantages over linear agents.

Purpose of the Study:

  • To evaluate the relaxivity, biodistribution, and toxicity of Gd-DOTA.
  • To compare Gd-DOTA with Gd-DTPA regarding stability and safety.
  • To investigate the correlation between in vitro stability and in vivo safety.

Main Methods:

  • In vitro stability assays comparing Gd-DOTA, Gd-DTPA, and Gd-EDTA.
  • T1 relaxivity measurements in saline and liver tissue at 20 MHz.
  • Biodistribution studies in rats.

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  • Toxicity assessment using median lethal dose (LD50) in mice.

    • Main Results:

    • Gd-DOTA exhibited significantly higher in vitro stability (10^28) than Gd-DTPA (10^23) and Gd-EDTA (10^17).
    • T1 relaxivity of Gd-DOTA was comparable to Gd-DTPA.
    • Biodistribution profiles were similar, with Gd-DOTA showing a shorter elimination half-life.
    • Gd-DOTA demonstrated a 93% higher LD50 than Gd-DTPA, with a greater safety factor (53 vs. 28).

    Conclusions:

    • Gd-DOTA possesses superior in vitro stability compared to Gd-DTPA.
    • In vivo safety, indicated by LD50 and safety factor, is significantly enhanced for Gd-DOTA.
    • The study supports the hypothesis that greater in vitro stability correlates with improved in vivo safety for gadolinium complexes.