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Related Experiment Videos

Antimalarials increase vesicle pH in Plasmodium falciparum.

D J Krogstad, P H Schlesinger, I Y Gluzman

    The Journal of Cell Biology
    |December 1, 1985
    PubMed
    Summary

    Malaria parasites utilize acidic vesicles for nutrient processing. Disrupting this vesicle acidity with antimalarials or weak bases inhibits parasite growth, highlighting pH regulation

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    Area of Science:

    • Cell Biology
    • Parasitology
    • Biochemistry

    Background:

    • The asexual erythrocytic stage of Plasmodium falciparum digests host hemoglobin within specialized vesicles.
    • Understanding the function and regulation of these parasite vesicles is crucial for developing new antimalarial strategies.

    Purpose of the Study:

    • To investigate the properties and pH dynamics of Plasmodium falciparum's food vacuole.
    • To explore the relationship between vesicle pH and the efficacy of antimalarial drugs.

    Main Methods:

    • Labeling host red blood cell cytoplasm with fluorescein-dextran.
    • Culturing Plasmodium falciparum and isolating parasite-containing vesicles after digitonin lysis.
    • Measuring vesicle pH using spectrofluorimetry and assessing responses to MgATP and weak bases (NH4Cl).

    Main Results:

    • Isolated vesicles exhibited acidic pH (5.2-5.4) and responded to MgATP (acidification) and NH4Cl (alkalinization).
    • These properties resemble endocytic vesicles in mammalian cells.
    • Antimalarials (chloroquine, quinine, mefloquine) and NH4Cl inhibited parasite growth at concentrations that increased vesicle pH.

    Conclusions:

    • Plasmodium falciparum's asexual erythrocytic cycle is highly dependent on maintaining acidic vesicle pH.
    • Antimalarials and weak bases likely exert their effects by interfering with this critical pH regulation.
    • Parasite vesicle pH modulation represents a potential therapeutic target for malaria treatment.

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