Gadolinium chloride toxicity in the rat

Area of Science:

• Toxicology
• Pharmacology
• Biomedical Research

Background:

• Gadolinium-based contrast agents (GBCAs) are widely used in medical imaging.
• Understanding the toxicological profile of GBCAs is crucial for patient safety.
• Previous studies have indicated potential for gadolinium deposition in tissues.

Purpose of the Study:

• To evaluate the toxicological effects of a single intravenous gadolinium chloride injection in Sprague-Dawley rats.
• To characterize the dose-dependent toxicity and tissue distribution of gadolinium chloride.
• To investigate the histopathological and biochemical changes induced by gadolinium chloride administration.

Main Methods:

• Single intravenous injection of gadolinium chloride at varying doses (0, 0.07, 0.14, 0.35 mmol/kg) in male and female rats.
• Necropsy at 48 hours and 14 days post-dose.
• Macroscopic, hematological, clinical chemistry, and histopathological analyses; electron microscopy and x-ray microanalysis.

Main Results:

• Gadolinium chloride induced dose-dependent mineral deposition in capillary beds (lung, kidney) and phagocytosis by the mononuclear phagocytic system.
• Hepatocellular and splenic necrosis with subsequent mineralization, and fundic glandular mucosa mineralization with hyperplasia were observed.
• Hematological changes included decreased platelet counts and increased prothrombin and activated partial thromboplastin times; gadolinium, calcium, and phosphate deposits were confirmed in spleen and liver.

Conclusions:

• Single intravenous administration of gadolinium chloride causes significant toxicological effects in rats, including organ damage and altered coagulation.
• The findings demonstrate gadolinium deposition in macrophages, Kupffer cells, and hepatocytes, indicating systemic distribution and potential long-term accumulation.
• This study underscores the importance of evaluating GBCA toxicity to ensure safe clinical application.