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The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
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Related Experiment Video

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Assessing Iron Deposition in the Brains of 5xFAD Mice by Perls'/DAB Staining
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Enhanced plutonium absorption in iron-deficient mice.

H A Ragan

    Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
    |October 1, 1975
    PubMed
    Summary

    Iron deficiency significantly increases plutonium absorption and retention in mice. Iron-deficient mice showed fourfold greater plutonium burden and faster bone translocation compared to iron-replete mice.

    Area of Science:

    • Toxicology
    • Environmental Health
    • Radiobiology

    Background:

    • Iron deficiency is a common nutritional disorder with potential implications for the absorption and distribution of toxic elements.
    • Plutonium is a highly toxic radioactive element with significant health risks upon internal exposure.

    Purpose of the Study:

    • To investigate the impact of iron deficiency on the absorption, distribution, and retention of orally administered plutonium in a mouse model.
    • To compare plutonium's toxicokinetics in iron-deficient versus iron-replete mice.

    Main Methods:

    • Single gastric intubation of plutonium in iron-deficient and iron-replete mice.
    • Measurement of total body burden and tissue distribution of plutonium at 24 and 96 hours post-gavage.

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    Main Results:

    • Total body burden of plutonium was approximately fourfold greater in iron-deficient mice compared to iron-replete mice at 24 and 96 hours.
    • Iron-deficient mice exhibited more rapid translocation of plutonium from soft tissues to bone by 96 hours.
    • In iron-replete mice, plutonium concentrations primarily increased in the liver during the observed time period.

    Conclusions:

    • Iron deficiency enhances the gastrointestinal absorption and subsequent systemic burden of orally ingested plutonium.
    • Iron status significantly influences plutonium's toxicokinetic behavior, leading to increased bone deposition in deficient states.
    • These findings highlight the critical role of nutritional status in modulating the health risks associated with plutonium exposure.