Conditioned pathogenicity of Microsporum gypseum biochemical mutants
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Abstract:
Experimental infections of guinea pigs with three biochemical mutants of Microsporum gypseum are described. Under normal conditions the mutants are avirulent. The virulence became manifested in two mutants (1) when substance necessary for growth of individual mutants were brought into the place of inoculation, (2) when the defense mechanism of the organism was altered with the application of immunosuppressive drugs. One of the mutants was permanently avirulent. The importance of experimental results for explanation of conditioned pathogenicity of some dermatophytes is discussed.
Insights
Biochemical mutants of Microsporum gypseum showed conditional pathogenicity in guinea pigs. Virulence was restored by supplying growth factors or using immunosuppressive drugs, highlighting conditioned pathogenicity in dermatophytes.
Area of Science:
- Medical Mycology
- Dermatophytosis Pathogenesis
Background:
- Microsporum gypseum is a common dermatophyte.
- Understanding the factors influencing fungal virulence is crucial for treating infections.
Purpose of the Study:
- To investigate the virulence of biochemical mutants of Microsporum gypseum in a guinea pig model.
- To explore the conditions under which these mutants exhibit pathogenicity.
Main Methods:
- Experimental infections were established in guinea pigs using three biochemical mutants of Microsporum gypseum.
- Virulence was assessed under normal conditions and after manipulation of the host's immune system or local environment.
Main Results:
- Under normal conditions, all three mutants were avirulent.
- Two mutants regained virulence when essential growth factors were supplied at the inoculation site.
- Immunosuppressive drugs also restored virulence in two of the mutants.
- One mutant remained permanently avirulent despite experimental manipulations.
Conclusions:
- The study demonstrates that certain dermatophytes, like Microsporum gypseum mutants, exhibit conditioned pathogenicity.
- Virulence is dependent on specific environmental factors and host immune status.
- These findings contribute to understanding the complex mechanisms underlying dermatophyte infections.