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An Introduction to the Influence of Nutritional Factors on the Pathogenesis of Opportunist Fungal Pathogens in Humans
Timothy Jong1, Colin M Stack1, Michelle C Moffitt1
1Western Sydney University, School of Science, Campbelltown, NSW 2560, Australia.
Abstract:
Fungi such as Aspergillus fumigatus, Candida albicans, and Cryptococcus neoformans are opportunistic pathogens in humans. They usually infect individuals whose immune system is compromised due to either a primary infection, e.g., HIV/AIDS, or as part of treatment for another condition, e.g., stem cell or solid organ transplant. In hosts with a weakened immune system, these fungi can cause life-threatening infections. Unlike true pathogens, opportunistic pathogens do not have specific mechanisms to overcome a healthy host, requiring a different approach to understand how they cause infection. The ability of fungi to adapt to various environmental conditions, including the human host, is critical for virulence. In humans, micronutrient metals, such as iron, are sequestered to reduce serum concentrations, which helps to inhibit microbial growth. Other human tissues may increase metal concentrations to toxic levels to prevent infection by pathogens. The ability of fungi to acquire or detoxify nutrients, such as iron or copper, from the host is essential for the establishment of infection. In this review, the role of fungal nutrition will be discussed in relation to opportunistic fungal pathogens. It will focus on the acquisition of micronutrients, e.g., iron, copper, and zinc, and how this enables these fungi to circumvent host nutritional immunity.
Insights
Opportunistic fungi like Aspergillus and Candida infect immunocompromised individuals by acquiring essential micronutrients, such as iron, from the host. Understanding fungal nutrition is key to combating these life-threatening infections.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Nutritional Immunology
Background:
- Opportunistic fungal pathogens (e.g., Aspergillus fumigatus, Candida albicans, Cryptococcus neoformans) cause severe infections in immunocompromised individuals.
- These fungi lack mechanisms to overcome healthy host defenses, necessitating a focus on their nutritional strategies for virulence.
- Host defenses include sequestering essential micronutrients like iron and increasing metal concentrations to toxic levels.
Purpose of the Study:
- To review the critical role of fungal nutrition in the pathogenesis of opportunistic fungal infections.
- To explore how fungi acquire essential micronutrients (iron, copper, zinc) from the host.
- To understand how nutrient acquisition enables fungi to overcome host nutritional immunity.
Main Methods:
- This is a review article, synthesizing existing research on fungal nutrition and host-pathogen interactions.
- The review focuses on the mechanisms of micronutrient acquisition by opportunistic fungi.
- It examines how these mechanisms contribute to fungal virulence and survival within the host.
Main Results:
- Fungal adaptation and nutrient acquisition are critical for virulence in opportunistic pathogens.
- The ability to acquire essential metals like iron, copper, and zinc is vital for fungi to establish infection.
- Fungi actively circumvent host nutritional immunity to ensure their survival and proliferation.
Conclusions:
- Fungal nutrition, particularly the acquisition of micronutrients, is a key determinant of virulence in opportunistic fungal pathogens.
- Targeting fungal nutrient acquisition pathways presents a potential strategy for developing novel antifungal therapies.
- Further research into host-pathogen nutritional interactions is crucial for understanding and treating these infections.
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