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Malaria parasites adopt host cell superoxide dismutase.

A S Fairfield, S R Meshnick, J W Eaton

    Science (New York, N.Y.)
    |August 19, 1983
    PubMed
    Summary

    Malaria parasites living in red blood cells scavenge host superoxide dismutase. This enzyme protects against harmful oxygen species, a vital adaptation for intraerythrocytic parasite survival.

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    Area of Science:

    • Parasitology
    • Biochemistry
    • Cell Biology

    Background:

    • Aerobic organisms require superoxide dismutase (SOD) to neutralize reactive oxygen species.
    • Intraerythrocytic malaria parasites inhabit an oxygen-rich environment, generating significant oxidative stress.
    • Understanding parasite adaptation to host defenses is crucial for malaria research.

    Purpose of the Study:

    • To investigate whether malaria parasites acquire host cell enzymes.
    • To determine if Plasmodium berghei utilizes host superoxide dismutase.
    • To establish if enzyme acquisition is host-specific.

    Main Methods:

    • Isolation of Plasmodium berghei parasites from infected mouse and rat red blood cells.
    • Biochemical assays to detect superoxide dismutase activity in isolated parasites.
    • Enzyme characterization to identify the source of SOD.

    Main Results:

    • Plasmodia isolated from mouse erythrocytes exhibited significant superoxide dismutase activity.
    • The detected superoxide dismutase in mouse-derived parasites was identified as the host mouse enzyme.
    • Parasites derived from rat erythrocytes contained rat superoxide dismutase, not mouse enzyme.

    Conclusions:

    • Plasmodium berghei acquires superoxide dismutase activity from its host red blood cell.
    • This represents the first documented instance of an intracellular parasite acquiring a host cell enzyme.
    • This host enzyme acquisition is a host-specific adaptation strategy for malaria parasites.

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