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Related Experiment Videos

Comparative immunology: sipunculid bactericidal responses.

E E Evans, J E Cushing, M L Evans

    Infection and Immunity
    |September 1, 1973
    PubMed
    Summary

    The sipunculid worm Dendrostomum zostericolum produces inducible bactericidins in response to bacterial injections. These immune molecules, found in coelomic fluid, show significant activity against bacteria.

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    Area of Science:

    • Invertebrate immunology
    • Comparative immunology
    • Antimicrobial peptides

    Background:

    • Sipunculid worms possess inducible immune responses.
    • Bactericidins are crucial components of invertebrate innate immunity.
    • Understanding these responses provides insights into evolutionary immunology.

    Purpose of the Study:

    • To investigate the inducible bactericidal activity in the sipunculid worm Dendrostomum zostericolum.
    • To characterize the optimal conditions for inducing and assaying bactericidin activity.
    • To explore the specificity and stability of these immune factors.

    Main Methods:

    • Intracoelomic injection of killed bacteria into Dendrostomum zostericolum.
    • Measurement of bactericidal titers in coelomic fluid using an established assay system.
    • Optimization of incubation time, temperature, and bacterial dose.
    • Thermal inactivation and cross-reactivity experiments.

    Main Results:

    • Bactericidal titers were significantly elevated in injected worms compared to controls.
    • Optimal induction and assay conditions involved 90 min incubation at 20-35°C.
    • Peak titers reached 1:1280 within 7 days post-injection with gram-negative bacteria.
    • The response showed relative non-specificity, and activity was heat-labile.

    Conclusions:

    • Dendrostomum zostericolum possesses a robust inducible bactericidal system.
    • The findings contribute to the understanding of innate immunity in marine invertebrates.
    • This study highlights the potential of invertebrate bactericidins in comparative immunology research.

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