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Variation in the lethal response in mice to yeast-like and pseudohyphal forms of Candida albicans
Abstract:
The lethal response in mice to yeast-like cells of Candida albicans grown for 3, 6, or 9 h in a defined minimal culture medium was more severe than that observed with corresponding pseudohyphal preparations. This differential effect could be only partially correlated with the greater number of viable units in respective yeast-like cultures. No significant differences between yeast-like and pseudohyphal syspensions were detected when turbidity-mass ratios were examined. The injection of physiological saline suspensions containing increasing quantities of yeast-like cells resulted in proportional decreases in mouse survival times. Conversely, when comparable experiments were conducted with pseudohyphal preparations no significant decreases in survival times occurred. The data indicate that these differences in the lethal response cannot be explained solely on the basis of a variation in the number of viable units or cell mass in corresponding yeast-like and pseudohyphal preparations. Factors contributing to this phenomenon may therefore include altered susceptibilities to host defense mechanisms in the early stages of the infectious process as a result of differences between these yeast-like and pseudohyphal inocula.
Insights
Candida albicans yeast cells are more lethal to mice than pseudohyphal forms, even when cell numbers and mass are similar. This suggests altered host defense interactions contribute to the severity of yeast infections.
Area of Science:
- Mycology
- Infectious Diseases
- Immunology
Background:
- Candida albicans exists in yeast and pseudohyphal forms.
- The differential pathogenicity of these forms is not fully understood.
Purpose of the Study:
- To investigate the differential lethal effects of Candida albicans yeast-like cells versus pseudohyphal forms in a murine model.
- To explore potential reasons for observed differences in pathogenicity.
Main Methods:
- Mice were inoculated with varying concentrations of yeast-like or pseudohyphal Candida albicans.
- Survival times and viable cell counts were assessed.
- Turbidity-mass ratios were used to compare cell biomass.
Main Results:
- Yeast-like cells induced a more severe lethal response in mice compared to pseudohyphal forms.
- This difference was not fully explained by variations in viable cell numbers or total cell mass.
- Increasing yeast cell doses proportionally decreased mouse survival, while pseudohyphal doses did not significantly alter survival.
Conclusions:
- The distinct lethal responses are not solely attributable to differences in cell viability or biomass.
- Altered interactions with host defense mechanisms during early infection stages may explain the differential pathogenicity of yeast-like versus pseudohyphal Candida albicans.
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