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Related Experiment Videos

DMSA, DMPS, and DMPA--as arsenic antidotes.

H V Aposhian, D E Carter, T D Hoover

    Fundamental and Applied Toxicology : Official Journal of the Society of Toxicology
    |April 1, 1984
    PubMed
    Summary

    Meso-dimercaptosuccinic acid (DMSA) and 2,3-dimercapto-1-propanesulfonic acid (DMPS) are effective chelating agents for arsenic poisoning, outperforming BAL. These compounds show promise in treating heavy metal poisoning.

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    Area of Science:

    • Toxicology
    • Pharmacology
    • Environmental Health

    Background:

    • Water-soluble dimercapto compounds like DMSA, DMPS, and DMPA are analogs of BAL.
    • BAL's effectiveness in treating arsenic poisoning is questioned due to increased brain arsenic levels in rabbits.

    Purpose of the Study:

    • To compare the therapeutic efficacy of DMSA, DMPS, DMPA, and BAL against sodium arsenite and Lewisite poisoning.
    • To evaluate the potential of these dimercapto compounds as antidotes for heavy metal poisoning.

    Main Methods:

    • Comparative study of dimercapto compounds in animal models (mice and rabbits).
    • Assessment of protection against lethal doses of sodium arsenite and Lewisite.
    • Evaluation of inhibition and reversal of pyruvate dehydrogenase complex by these agents.

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    Main Results:

    • DMSA demonstrated superior protection against sodium arsenite compared to DMPS, DMPA, and BAL (42:14:4:1 ratio).
    • DMPS, DMPA, and DMSA mobilized tissue arsenic, while BAL increased brain arsenic levels.
    • DMSA and DMPS protected rabbits against Lewisite poisoning and showed prophylactic potential.
    • DMPS was most potent in preventing/reversing sodium arsenite inhibition of the pyruvate dehydrogenase complex.

    Conclusions:

    • DMSA and DMPS are promising alternatives to BAL for treating arsenic and Lewisite poisoning.
    • Further research into the metabolism of these compounds is needed.
    • Dimercapto compounds show potential as broad-spectrum heavy metal chelators, but clinical studies are limited due to funding challenges.