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Immunological relatedness among Candida albicans and other pathogenic Candida species
Abstract:
Membrane-mitochondrial (butanol-hot phosphate-buffered saline) and cytosol (soluble cytoplasmic substances) extracts from seven pathogenic species of Candida were used in in vivo and in vitro immunological assays to study antigenic similarities among the strains with respect to C. albicans. Mice were sensitized with C. albicans serotype A for footpad testing or to provide cells for lymphocyte stimulation assays, and guinea pigs were immunized with whole cells or butanol-hot phosphate-buffered saline extracts of C. albicans to obtain antisera for immunodiffusion assays. When extracts from each of the seven species were used in the assays, they consistently segregated, as determined by statistical or subjective analyses, into three groups. Extracts of C. albicans serotype A or B and C. stellatoidea were the most immunologically reactive in all assays, indicating close similarities between those two species, whereas extracts of C. tropicalis and C. parapsilosis elicited only moderate responses. Extracts from C. krusei, C. guilliermondii, and C. pseudotropicalis were hypo- or nonreactive in the assays, indicating a low level of antigenic relatedness to C. albicans.
Insights
This study investigated antigenic similarities among seven Candida species using immunological assays. Candida albicans and Candida stellatoidea showed the highest reactivity, indicating close relationships.
Area of Science:
- Mycology
- Immunology
- Medical Microbiology
Background:
- Pathogenic Candida species cause significant human infections.
- Understanding antigenic relationships is crucial for diagnostics and therapeutics.
- Candida albicans is the most common human fungal pathogen.
Purpose of the Study:
- To determine antigenic similarities among seven pathogenic Candida species.
- To compare the antigenic profiles of various Candida species relative to Candida albicans.
- To assess the immunological reactivity of different Candida extracts.
Main Methods:
- Preparation of membrane-mitochondrial and cytosol extracts from seven Candida species.
- In vivo and in vitro immunological assays, including footpad testing and lymphocyte stimulation.
- Immunization of guinea pigs and use of antisera for immunodiffusion assays.
- Statistical and subjective analyses of antigenic reactivity.
Main Results:
- Candida extracts segregated into three immunological groups.
- Candida albicans (serotypes A and B) and Candida stellatoidea exhibited the highest reactivity, suggesting close antigenic similarity.
- Candida tropicalis and Candida parapsilosis showed moderate responses.
- Candida krusei, Candida guilliermondii, and Candida pseudotropicalis displayed low or no reactivity, indicating distant antigenic relatedness to C. albicans.
Conclusions:
- Significant antigenic heterogeneity exists among pathogenic Candida species.
- Candida albicans and C. stellatoidea are antigenically closely related.
- C. krusei, C. guilliermondii, and C. pseudotropicalis are antigenically distinct from C. albicans.