Cited by 214Fungal Infections and StudiesStudies on Chitinases and ChitosanasesImmune responses and vaccinations

Chitin Recognition via Chitotriosidase Promotes Pathologic Type-2 Helper T Cell Responses to Cryptococcal Infection

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Wiesner, Darin L., Specht, Charles A., Lee, Chrono K., Smith, Kyle D., Mukaremera, Liliane, Lee, S. Thera, Lee, Chun G., Elias, Jack A. +6 more·2015·PLOS Pathogens

Abstract

Pulmonary mycoses are often associated with type-2 helper T (Th2) cell responses. However, mechanisms of Th2 cell accumulation are multifactorial and incompletely known. To investigate Th2 cell responses to pulmonary fungal infection, we developed a peptide-MHCII tetramer to track antigen-specific CD4+ T cells produced in response to infection with the fungal pathogen Cryptococcus neoformans. We noted massive accruement of pathologic cryptococcal antigen-specific Th2 cells in the lungs following infection that was coordinated by lung-resident CD11b+ IRF4-dependent conventional dendritic cells. Other researchers have demonstrated that this dendritic cell subset is also capable of priming protective Th17 cell responses to another pulmonary fungal infection, Aspergillus fumigatus. Thus, higher order detection of specific features of fungal infection by these dendritic cells must direct Th2 cell lineage commitment. Since chitin-containing parasites commonly elicit Th2 responses, we hypothesized that recognition of fungal chitin is an important determinant of Th2 cell-mediated mycosis. Using C. neoformans mutants or purified chitin, we found that chitin abundance impacted Th2 cell accumulation and disease. Importantly, we determined Th2 cell induction depended on cleavage of chitin via the mammalian chitinase, chitotriosidase, an enzyme that was also prevalent in humans experiencing overt cryptococcosis. The data presented herein offers a new perspective on fungal disease susceptibility, whereby chitin recognition via chitotriosidase leads to the initiation of harmful Th2 cell differentiation by CD11b+ conventional dendritic cells in response to pulmonary fungal infection.

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  • On titan cell formation, the polysaccharide capsule becomes condensed and highly crosslinked; the cell wall can increase in thickness from 50-100 nm to 2-3 μm; and cell wall composition is altered through an increase in chitin content and a decrease in glucan.

    “On titan cell formation, the polysaccharide capsule surrounding Cryptococcus cells becomes condensed and highly crosslinked151; the cell wall can increase in thickness from 50–100 nm to 2–3 µm (ref.147), and the cell wall composition is altered through an increase in chitin content and a decrease in glucan152.”
  • The increase in chitin induces a T helper 2-type allergic response and cytokine release, rather than a protective T helper 1-type response, which leads to increased mortality in infected mice.

    “This increase in chitin induces a T helper 2-type allergic response and cytokine release, rather than a protective T helper 1-type response, which leads to increased mortality in infected mice152.”

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Authors
Wiesner, D. L., Specht, C. A., Lee, C. K., Smith, K. D., Mukaremera, L., Lee, S. T., Lee, C. G., Elias, J. A., Nielsen, J. N., Boulware, D. R., Bohjanen, P. R., Jenkins, M. K., Levitz, S. M., & Nielsen, K.
Affiliations
  • University of Minnesota (US)
  • University of Massachusetts Chan Medical School (US)
  • Brown University (US)
  • University of North Carolina at Chapel Hill (US)
Corresponding author
Nielsen, Kirsten
Venue
PLOS Pathogens
Published
2015-03-12
Volume
11
Issue
3
Pages
e1004701
ISSN
  • 1553-7366 (ISSN-L)
  • 1553-7374
OpenAlex
W2005361432
Cited by
214
References
83
Citations by year
2026: 8 · 2025: 17 · 2024: 17 · 2023: 12 · 2022: 18 · 2021: 9 · 2020: 18 · 2019: 26 · 2018: 30 · 2017: 27 · 2016: 20 · 2015: 12
FWCI
23.30
Type
journal article
Language
en
Open access
Locations
  • PLoS Pathogens (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • The Journal of the American Medical Association (JAMA) Network (American Medical Association) (submittedVersion, cc-by)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • UNC Libraries
Funders
  • Pfizer
  • University of Minnesota
  • National Institutes of Health (UL1TR000114, NIH T32)
  • National Heart, Lung, and Blood Institute (R01HL112671, HL112671)
  • National Cancer Institute (P30CA077598)
  • National Institute of Allergy and Infectious Diseases (AI072195, AI025780, R21AI093302, AI 007313, R01AI025780, R01AI080275, R01AI039614, AI093302, AI089067, K24AI096925, AI039614, R01AI072195, AI080275, T32AI007313)
  • National Center for Advancing Translational Sciences
Topics
  • Health Sciences › Medicine › Epidemiology › Fungal Infections and Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Studies on Chitinases and Chitosanases
  • Life Sciences › Immunology and Microbiology › Immunology › Immune responses and vaccinations
Keywords
chitin recognition, chitotriosidase, Th2 differentiation, Cryptococcus neoformans, pulmonary cryptococcosis, fungal lung infection, IRF4, fungal chitin, Th17 cells, Aspergillus fumigatus
MeSH terms
Animals, Antigens, Fungal, Chitin, Cryptococcosis, Cryptococcus neoformans, Dendritic Cells, Disease Models, Animal, Flow Cytometry, Hexosaminidases, Lung Diseases, Fungal, Lymphocyte Activation, Mice, Inbred C57BL, Microscopy, Fluorescence, Th2 Cells, Mice

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