Low virulent strains of Candida albicans: unravelling the antigens for a future vaccine

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Elena Fernández-Arenas1, Gloria Molero, César Nombela

  • 1Departamento de Microbiología II, Facultad de Farmacia, Universidad Complutense, Madrid, Spain.

Proteomics
|September 21, 2004
PubMed

Insights

A Candida albicans mutant strain, CNC13, demonstrated significant protection against systemic candidiasis in mice. This study identified key immunogenic proteins from CNC13 as potential candidates for a novel fungal vaccine.

Area of Science:

  • Mycology
  • Immunology
  • Vaccine Development

Background:

  • Systemic candidiasis remains a significant threat, necessitating effective preventative strategies.
  • Attenuated microbial strains are explored as vaccine candidates to elicit protective immunity.
  • Understanding the immunogenic components of vaccine strains is crucial for rational vaccine design.

Purpose of the Study:

  • To evaluate the efficacy of low-virulent Candida albicans mutant strains as vaccines against systemic candidiasis in a murine model.
  • To identify specific immunogenic proteins from a protective vaccine strain using a proteomic approach.
  • To define antibody profiles associated with protection induced by the vaccine candidate.

Main Methods:

  • Utilized three low-virulent Candida albicans mutant strains (CM1613, CNC13, 92') in a murine model of systemic candidiasis.
  • Administered mutant strains as vaccines and subsequently challenged with a lethal dose of wild-type C. albicans.
  • Employed a proteomic approach, including 2D gel electrophoresis and mass spectrometry, to identify immunogenic proteins.
  • Analyzed antibody responses (isotype IgG2a) in vaccinated and non-vaccinated animals.

Main Results:

  • The CNC13 mutant strain induced significant protection, resulting in 60-70% survival in vaccinated mice.
  • Proteomic analysis identified 25 immunogenic C. albicans proteins.
  • Distinct antibody profiles were observed between surviving (CNC13-vaccinated) and non-vaccinated animals.
  • Identified specific antigens, including enolase (Eno1p), pyruvate kinase (Cdc19p), and novel antigens Imh3p and Acs2p, that elicited protective IgG2a antibodies.

Conclusions:

  • The CNC13 mutant strain is a promising vaccine candidate for systemic candidiasis, inducing long-lasting protection.
  • Proteomic analysis effectively identified key antigens responsible for protective immunity.
  • The identified antigenic proteins are strong candidates for the development of a future fungal vaccine.

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