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Related Experiment Videos

Immunoprotection against systemic candidiasis in mice

D Tavares1, P Ferreira, M Vilanova

  • 1Laboratory of Microbiology, Institute for Biomedical Sciences, Abel Salazar, Porto, Portugal.

International Immunology
|May 1, 1995
PubMed
Summary

Candida albicans produces an immunosuppressive protein, p43, crucial for fungal survival. Antibodies against p43 protect against infection, while antibodies against fungal sonicates increase susceptibility.

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Area of Science:

  • Immunology
  • Microbiology
  • Mycology

Background:

  • Candida albicans produces an immunosuppressive B cell mitogenic (p43) protein vital for its host survival.
  • The N-terminal amino acid sequence of p43 is novel and not found in existing protein databases.

Purpose of the Study:

  • To investigate the protective potential of antibodies against p43 and Candida albicans sonicates (Cs) in a murine model.
  • To evaluate the role of p43 in C. albicans pathogenesis and host immune response.

Main Methods:

  • Immunization of BALB/c mice with purified p43 protein and C. albicans sonicates (Cs).
  • Assessment of immune cell populations (B cells, CD4+ lymphocytes) and antibody responses (IgG2a, IgG2b, IgM).
  • Evaluation of protection against C. albicans infection and passive antibody transfer experiments.

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Main Results:

  • Immunization with p43 partially neutralized its immunosuppressive effects and fully protected mice against C. albicans infection.
  • Antibodies against p43 conferred protection, whereas antibodies against Cs facilitated infection.
  • Passive transfer of anti-p43 antibodies protected mice, while anti-Cs antibodies increased susceptibility.

Conclusions:

  • Specific antibodies targeting the p43 protein are crucial for protective immunity against Candida albicans.
  • Immunointervention strategies should focus on p43 to effectively combat C. albicans infections.
  • Conversely, targeting whole fungal sonicates may be detrimental, potentially enhancing fungal pathogenesis.