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Updated: Dec 29, 2025
Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
Published on: December 19, 2014
Environmental Factors That Contribute to the Maintenance of Cryptococcus neoformans Pathogenesis
Maphori Maliehe1, Mathope A Ntoi1, Shayanki Lahiri1
1Department of Microbial, Biochemical and Food Biotechnology, University of the Free State, Bloemfontein 9301, Free State, South Africa.
Abstract:
The ability of microorganisms to colonise and display an intracellular lifestyle within a host body increases their fitness to survive and avoid extinction. This host-pathogen association drives microbial evolution, as such organisms are under selective pressure and can become more pathogenic. Some of these microorganisms can quickly spread through the environment via transmission. The non-transmittable fungal pathogens, such as Cryptococcus, probably return into the environment upon decomposition of the infected host. This review analyses whether re-entry of the pathogen into the environment causes restoration of its non-pathogenic state or whether environmental factors and parameters assist them in maintaining pathogenesis. Cryptococcus (C.) neoformans is therefore used as a model organism to evaluate the impact of environmental stress factors that aid the survival and pathogenesis of C. neoformans intracellularly and extracellularly.
Insights
Fungal pathogens like Cryptococcus can survive within hosts, but their return to the environment may restore or maintain their virulence. Environmental factors influence Cryptococcus neoformans pathogenesis both inside and outside the host.
Area of Science:
- Microbiology and Environmental Science
- Pathogen Evolution and Host-Pathogen Interactions
Background:
- Microbial intracellular lifestyles enhance survival and drive evolution towards increased pathogenicity.
- Non-transmittable fungal pathogens, such as Cryptococcus, likely re-enter the environment after host decomposition.
Purpose of the Study:
- To analyze whether environmental re-entry restores the non-pathogenic state of fungal pathogens.
- To investigate if environmental factors aid fungal pathogens in maintaining pathogenesis extracellularly.
- To evaluate the impact of environmental stress on Cryptococcus neoformans survival and pathogenesis.
Main Methods:
- Review of existing literature on microbial host-pathogen associations and environmental survival.
- Utilizing Cryptococcus neoformans as a model organism for studying environmental stress factors.
- Analysis of intracellular and extracellular pathogenesis mechanisms influenced by environmental parameters.
Main Results:
- Host-pathogen interactions exert selective pressure, potentially increasing microbial pathogenicity.
- Environmental factors may play a crucial role in maintaining or restoring virulence in fungal pathogens.
- Cryptococcus neoformans survival and pathogenesis are significantly impacted by diverse environmental stressors.
Conclusions:
- Environmental re-entry does not necessarily lead to the loss of pathogenicity in fungal species.
- Environmental conditions can support the continued virulence of pathogens like Cryptococcus.
- Understanding environmental influences is key to managing Cryptococcus neoformans pathogenesis.
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