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Th17 Inflammation Model of Oropharyngeal Candidiasis in Immunodeficient Mice
Published on: February 18, 2015
Severe Candida spp. infections: new insights into natural immunity
Jos W M van der Meer1, Frank L van de Veerdonk, Leo A B Joosten
1Department Internal Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. J.vandermeer@aig.umcn.nl
Abstract:
Invasive infections caused by Candida spp. are associated with high mortality. Colonisation by Candida spp. and the capacity of the host to recognise them as potential pathogens are essential steps in the development of these infections. The major pathogen-associated molecular patterns of Candida are mannoproteins, glucans and chitins, which are recognised by C-type lectin pattern recognition receptors such as the mannose receptor, dectin-1 and dectin-2. By the secretion of proteases and toxins, and the formation of hyphae and biofilms, Candida spp. are able to enhance their virulence and pathogenicity. Studies in patients with relatively rare immunodeficiencies, such as dectin-1 deficiency, CARD9 deficiency, chronic mucocutaneous candidiasis, hyper-IgE/Job's syndrome and chronic granulomatous disease, have shown the role of dectin-1 and its signalling pathway, which involves interleukins 17 and 22, defensins and phagocytic cells, in defence against Candida. These studies also provide insights into how acquired risk factors for fungal infection operate, and may lead to new approaches for immunotherapy.
Insights
Candida infections are deadly. Host immune cells, like those recognizing dectin-1, are crucial for fighting Candida, offering potential for new immunotherapies.
Area of Science:
- Immunology
- Mycology
- Infectious Diseases
Background:
- Invasive Candida infections cause high mortality.
- Host recognition of Candida as a pathogen is key.
- Candida virulence factors include proteases, toxins, hyphae, and biofilms.
Purpose of the Study:
- To explore the host immune response to Candida.
- To investigate the role of C-type lectin receptors in Candida recognition.
- To understand the implications of immunodeficiencies for Candida defense.
Main Methods:
- Review of studies on rare immunodeficiencies (e.g., dectin-1 deficiency, CARD9 deficiency).
- Analysis of the dectin-1 signaling pathway involving IL-17, IL-22, defensins, and phagocytes.
- Examination of how acquired risk factors influence fungal infections.
Main Results:
- Studies highlight the critical role of dectin-1 and its signaling pathway in combating Candida.
- Deficiencies in dectin-1, CARD9, and other immune pathways impair Candida defense.
- Understanding these pathways provides insights into fungal pathogenesis.
Conclusions:
- The dectin-1 pathway is essential for host defense against Candida.
- Insights from immunodeficient patients can inform immunotherapy strategies.
- Further research may lead to novel treatments for invasive fungal infections.
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