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Response to Oxidative Stress in Sporothrix schenckii
Estela Ruiz-Baca1, Pablo Jaciel Adame-Soto1, Carlos Antonio Alba-Fierro1
1Facultad de Ciencias Químicas, Universidad Juárez del Estado de Durango, Av. Veterinaria S/N, Durango C.P. 34120, Mexico.
Abstract:
Oxidative stress is key in immune defense against fungal infections, such as those caused by Sporothrix schenckii, the dimorphic fungus responsible for sporotrichosis. Phagocytic cells utilize oxidative stress as a crucial mechanism to control pathogen spread. During S. schenckii infection, phagocytic cells recognize pathogen-associated molecular patterns (PAMPs) on their surface through conserved transmembrane or soluble receptors, known as pattern recognition receptors (PRRs). This recognition triggers a cascade of immune responses, including the generation reactive oxygen species (ROS) essential for pathogen elimination. However, S. schenckii has developed sophisticated mechanisms to evade and counteract this response, contributing to its persistence in the host. These mechanisms include the production of antioxidant enzymes, alterations to its cell wall (CW), and the production of melanin, which helps neutralize oxidative stress. In addition, S. schenckii modulates the production of other proteins, such as moonlighting proteins, suggested to have roles in immune evasion and stress response, helping its survival in the host. These strategies, along with the modulation of gene expression, allow the fungus to survive and persist inside the immune system's hostile environment, facilitating the progression of the infection. Understanding these interactions between phagocytic cells and S. schenckii is key to developing more effective therapeutic strategies to combat sporotrichosis.
Insights
Sporothrix schenckii uses antioxidant defenses and cell wall modifications to evade immune cells
Area of Science:
- Mycology
- Immunology
- Infectious Diseases
Background:
- Oxidative stress is a critical immune mechanism against fungal infections like sporotrichosis, caused by Sporothrix schenckii.
- Phagocytic cells use pattern recognition receptors (PRRs) to detect pathogen-associated molecular patterns (PAMPs) on S. schenckii, initiating immune responses.
- S. schenckii employs sophisticated evasion strategies to survive host immune defenses.
Purpose of the Study:
- To elucidate the intricate interactions between phagocytic immune cells and Sporothrix schenckii during infection.
- To understand the mechanisms by which S. schenckii evades oxidative stress and persists within the host.
- To identify potential therapeutic targets for combating sporotrichosis.
Main Methods:
- The study reviews existing literature on the immune response to S. schenckii.
- Analysis of S. schenckii's known mechanisms for counteracting host defenses, including antioxidant production, cell wall alterations, and melanin synthesis.
- Investigation into the role of moonlighting proteins in fungal immune evasion and stress response.
Main Results:
- S. schenckii actively counteracts host-generated reactive oxygen species (ROS) through antioxidant enzymes and melanin production.
- Fungal cell wall modifications and the modulation of moonlighting proteins contribute to immune evasion and survival.
- S. schenckii manipulates gene expression to persist in the hostile intracellular environment.
Conclusions:
- S. schenckii possesses multifaceted strategies to evade immune detection and oxidative stress, facilitating persistent infection.
- Understanding these fungal evasion tactics is crucial for developing novel and effective treatments for sporotrichosis.
- Targeting S. schenckii's survival mechanisms offers a promising avenue for future therapeutic interventions.
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