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Decrease of plasma vitamin A, albumin and zinc in cadmium-treated rats

C Sugawara, N Sugawara, H Miyake

    Toxicology Letters
    |August 1, 1981
    PubMed
    Summary
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    Cadmium (Cd) exposure in rats decreased plasma vitamin A (VA) levels, potentially due to liver damage. Fractionated Cd injections appeared less toxic to VA metabolism than continuous exposure.

    Area of Science:

    • Toxicology
    • Biochemistry
    • Nutritional Science

    Background:

    • Cadmium (Cd) is a toxic heavy metal with known adverse health effects.
    • Vitamin A (VA) is essential for various physiological functions.
    • Understanding the interaction between Cd exposure and VA metabolism is crucial for public health.

    Purpose of the Study:

    • To investigate the effects of different cadmium (Cd) administration routes and schedules on plasma and liver vitamin A (VA) concentrations in Wistar rats.
    • To explore the relationship between Cd-induced changes in VA levels, plasma albumin, and zinc (Zn) concentrations.
    • To assess the potential role of hepatic damage in Cd intoxication and its impact on VA metabolism.

    Main Methods:

    • Male Wistar rats were exposed to cadmium via subcutaneous injections or oral administration in drinking water.

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  • Different dosing regimens were employed for subcutaneous injections (fractionated vs. single high dose).
  • Plasma and liver concentrations of vitamin A (VA), albumin, and zinc (Zn) were measured and statistically analyzed.

    • Main Results:

    • Subcutaneous cadmium injections significantly decreased plasma vitamin A (VA) levels, while liver VA concentrations remained unchanged.
    • Fractionated cadmium injections showed reduced toxicity on VA metabolism compared to a single high dose.
    • Plasma VA levels were highly correlated with plasma albumin concentrations, suggesting a link to hepatic function.
    • Plasma VA also showed a significant correlation with plasma zinc (Zn), though weaker than with albumin.

    Conclusions:

    • Cadmium exposure, particularly via subcutaneous injection, negatively impacts vitamin A (VA) metabolism, primarily affecting plasma levels.
    • The observed decrease in plasma VA is likely associated with cadmium-induced hepatic damage.
    • While zinc (Zn) levels correlate with VA, the findings suggest that Zn deficiency alone does not explain the reduction in plasma VA.
    • Further research into the hepatic secretion mechanisms of VA and Zn is warranted to fully elucidate their metabolic interplay during cadmium intoxication.