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Plasmodium falciparum maturation abolishes physiologic red cell deformability

H A Cranston, C W Boylan, G L Carroll

    Science (New York, N.Y.)
    |January 27, 1984
    PubMed

    Insights

    Plasmodium falciparum infection impairs red blood cell deformability, especially in early stages. This reduced flexibility helps the spleen remove infected cells from circulation.

    Area of Science:

    • Hematology
    • Parasitology
    • Cellular Biophysics

    Background:

    • Red blood cells (RBCs) normally deform to navigate narrow capillaries and the spleen.
    • Plasmodium falciparum infection alters RBC properties, impacting disease severity and clearance.

    Purpose of the Study:

    • To investigate how Plasmodium falciparum infection and parasite maturation affect RBC deformability under shear stress.
    • To elucidate the biophysical mechanisms underlying the removal of infected RBCs by the spleen.

    Main Methods:

    • Utilized a rheoscope to apply controlled fluid shear stress to infected RBCs in vitro.
    • Examined RBC deformability and shape recovery in cells infected with different erythrocytic stages of Plasmodium falciparum.

    Main Results:

    • RBCs with early-stage parasites (ring forms) showed significantly impaired deformability and slower shape recovery.
    • RBCs with mature parasites (trophozoites, schizonts) did not deform under tested shear stresses.
    • Parasite infection alters RBC mechanical properties, affecting their ability to deform.

    Conclusions:

    • Impaired RBC deformability in early Plasmodium falciparum infection provides a mechanism for splenic clearance.
    • Altered RBC mechanics contribute to the removal of parasitized cells, aiding in host defense.
    • Understanding these changes is crucial for comprehending malaria pathogenesis and immune evasion.

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