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Immune responses to fungal infections and therapeutic implications
1Department of Internal Medicine, Immunolgy and Infectious Diseases, University of Bari, Italy. m.altamura@midim.uniba.it
Abstract:
Host responses to fungi result from a coordinate interplay between innate and adaptative immune system. Neutrophils and monocytes are involved in the non specific clearance of yeasts (e.g. Candida albicans and Cryptococcus neoformans), while T helper 1 type responses are protective via release of interferon gamma. By contrast, T helper 2 responses (IL-4 and IL 10 release) correlate with disease exacerbation and pathology. IL-12 production which enhances T helper 1 type responses seem to exert a beneficial role in the course of Candida infection. In particular, its production from neutrophilis may support memory T helper 1 cell responses of the fungus. With respect to anti-Candida vaccines several approaches are in progress, such as use of heat-killed Candida albicans in combination with adjuvants, purified peptides and proteins and immunogenic peptide-lipid conjugates. Furthermore, exogenous IL-12 may play an important role in inducing a T helper 1 anticandidal response, also replacing neutrophils in neutropenic patients. At the same time, granulocyte-colony stimulating factor has exhibited therapeutic efficacy in experimental and human models of fungal infection.
Insights
Host immune responses to fungal infections involve both innate and adaptive immunity. Interleukin-12 (IL-12) enhances protective T helper 1 responses, aiding in fungal clearance and vaccine development.
Area of Science:
- Immunology
- Mycology
- Infectious Diseases
Background:
- Host immune responses to fungi involve innate and adaptive immunity.
- Neutrophils and monocytes aid in non-specific yeast clearance (e.g., Candida albicans, Cryptococcus neoformans).
- T helper 1 (Th1) responses, via interferon-gamma, are protective, while T helper 2 (Th2) responses correlate with disease exacerbation.
Purpose of the Study:
- To explore the role of Interleukin-12 (IL-12) in anti-fungal immunity.
- To review current anti-Candida vaccine strategies.
- To assess the therapeutic potential of IL-12 and granulocyte-colony stimulating factor (G-CSF) in fungal infections.
Main Methods:
- Review of existing literature on host-fungal interactions and immune responses.
- Analysis of the role of cytokines, specifically IL-12, in modulating Th1 and Th2 responses.
- Examination of current and potential therapeutic strategies, including vaccines and immunomodulatory agents.
Main Results:
- IL-12 production enhances protective Th1 responses against Candida infection.
- IL-12 may support memory Th1 cell responses and can potentially replace neutrophils in neutropenic patients.
- Various anti-Candida vaccine approaches are under development, including heat-killed yeasts, peptides, and conjugates.
- Granulocyte-colony stimulating factor (G-CSF) shows therapeutic efficacy in experimental and human fungal infection models.
Conclusions:
- IL-12 plays a beneficial role in anti-fungal immunity by promoting Th1 responses.
- Exogenous IL-12 and G-CSF represent promising therapeutic strategies for fungal infections, particularly in immunocompromised individuals.
- Further research into vaccine development and immunomodulation is crucial for combating fungal diseases.