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Related Experiment Videos

Polyclonal B-cell activation during rodent malarial infections.

R R Freeman, C R Parish

    Clinical and Experimental Immunology
    |April 1, 1978
    PubMed
    Summary

    Malaria infection, caused by Plasmodium parasites, increases specific antibody-secreting cells in mice. These elevated plaque-forming cells (PFC) are linked to factors released from infected red blood cells.

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    Area of Science:

    • Immunology
    • Parasitology
    • Infectious Diseases

    Background:

    • Plasmodium infections, like malaria, significantly impact the host immune system.
    • Understanding immune responses to parasitic infections is crucial for developing effective treatments.
    • Elevated immune cell activity, specifically antibody production, is a common observation during parasitic diseases.

    Purpose of the Study:

    • To investigate the effect of Plasmodium berghei and Plasmodium yoelii infections on 'background' plaque-forming cells (PFC) in BALB/c mice.
    • To identify the nature of the factor(s) responsible for elevated PFC numbers in infected mice.

    Main Methods:

    • BALB/c mice were infected with Plasmodium berghei and Plasmodium yoelii.
    • Spleens were analyzed for 'background' plaque-forming cells (PFC) secreting IgM against sheep and horse erythrocytes.
    • Uninfected mice received high-speed supernatants from parasitized red blood cell lysates.
    • Supernatants were tested for non-dialyzable factors stable at 56°C but destroyed at 100°C.

    Main Results:

    • Infection with Plasmodium parasites led to a significant increase in 'background' PFC numbers in mouse spleens.
    • Injection of supernatants from infected red blood cells also elevated 'background' PFC counts in uninfected mice.
    • The active factor(s) in the supernatants were non-dialyzable and heat-stable at 56°C, but inactivated by boiling.

    Conclusions:

    • Plasmodium infection induces an increase in specific antibody-secreting cells, suggesting a polyclonal B cell activation.
    • Factors released from Plasmodium-infected erythrocytes contribute to this immune stimulation.
    • The heat-stable, non-dialyzable nature of the active factor(s) provides clues for their molecular characterization.

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