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Related Experiment Videos

Immunization with Staphylococcus aureus lysate incorporated into microspheres.

C N O'Brien1, A J Guidry, L W Douglass

  • 1Immunology and Disease Resistance Laboratory, USDA, Beltsville, MD 20705, USA. cobrien@anri.barc.usda.gov

Journal of Dairy Science
|August 24, 2001
PubMed
Summary

Biodegradable microspheres carrying Staphylococcus aureus lysate show promise for enhancing bovine immunity against mastitis. This approach boosts opsonizing antibodies and inhibits bacterial adherence, offering a potential new strategy for controlling S. aureus infections.

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Area of Science:

  • Veterinary Immunology
  • Bacterial Pathogenesis
  • Vaccine Technology

Background:

  • Antibiotic resistance and scar tissue limit treatment efficacy for Staphylococcus aureus (S. aureus) mastitis.
  • Bovine neutrophils are crucial for combating S. aureus, but vaccines enhancing their function have shown limited success due to the bacteria's capsule.
  • S. aureus can adhere to and penetrate mammary epithelial tissue, complicating infection control.

Purpose of the Study:

  • To investigate if S. aureus lysate encapsulated in biodegradable microspheres can enhance opsonizing antibody production against the bacterial capsule.
  • To determine if this microsphere-based approach can inhibit S. aureus adherence to mammary epithelium.

Main Methods:

  • Four groups of cows were immunized with S. aureus lysate formulated in NaCl, Freund's incomplete adjuvant (FICA), microspheres in NaCl, or microspheres in FICA.

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  • Injections were administered in the supramammary lymph node and hip muscle.
  • Antibody response, neutrophil opsonization, and bacterial adherence inhibition were assessed post-immunization.

    • Main Results:

    • Microsphere encapsulation yielded an antibody response comparable in type to FICA but of lesser magnitude.
    • Antibodies generated by microsphere immunization were more opsonic for neutrophils at 20 and 52 weeks post-immunization.
    • The microsphere formulation effectively inhibited S. aureus adherence to mammary epithelium.

    Conclusions:

    • Biodegradable microspheres offer controlled antigen release and presentation, potentially enabling long-term immunity with a single injection.
    • This technology warrants further investigation as a novel strategy to improve bovine mastitis control against S. aureus.