IL-4 receptor-alpha-dependent control of Cryptococcus neoformans in the early phase of pulmonary infection

PLoS One. 2014 Jan 27;9(1):e87341. doi: 10.1371/journal.pone.0087341. eCollection 2014.

Abstract

Cryptococcus neoformans is an opportunistic fungal pathogen that causes lung inflammation and meningoencephalitis in immunocompromised people. Previously we showed that mice succumb to intranasal infection by induction of pulmonary interleukin (IL)-4Rα-dependent type 2 immune responses, whereas IL-12-dependent type 1 responses confer resistance. In the experiments presented here, IL-4Rα⁻/⁻ mice unexpectedly show decreased fungal control early upon infection with C. neoformans, whereas wild-type mice are able to control fungal growth accompanied by enhanced macrophage and dendritic cell recruitment to the site of infection. Lower pulmonary recruitment of macrophages and dendritic cells in IL-4Rα⁻/⁻ mice is associated with reduced pulmonary expression of CCL2 and CCL20 chemokines. Moreover, IFN-γ and nitric oxide production are diminished in IL-4Rα⁻/⁻ mice compared to wild-type mice. To directly study the potential mechanism(s) responsible for reduced production of IFN-γ, conventional dendritic cells were stimulated with C. neoformans in the presence of IL-4 which results in increased IL-12 production and reduced IL-10 production. Together, a beneficial role of early IL-4Rα signaling is demonstrated in pulmonary cryptococcosis, which contrasts with the well-known IL-4Rα-mediated detrimental effects in the late phase.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies, Monoclonal / immunology
  • Cryptococcosis / immunology*
  • Cryptococcus neoformans / immunology*
  • DNA Primers / genetics
  • Dendritic Cells / immunology
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Flow Cytometry
  • Interferon-gamma / immunology
  • Interleukin-10 / immunology
  • Interleukin-12 / immunology
  • Interleukin-4 Receptor alpha Subunit / genetics
  • Interleukin-4 Receptor alpha Subunit / immunology*
  • Macrophages / immunology
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Pneumonia / immunology
  • Pneumonia / microbiology*
  • Signal Transduction / immunology*

Substances

  • Antibodies, Monoclonal
  • DNA Primers
  • Interleukin-4 Receptor alpha Subunit
  • Interleukin-10
  • Interleukin-12
  • Interferon-gamma

Grants and funding

This work was supported by the Deutsche Forschungsgemeinschaft (German Research Foundation, grant AL 371/5-4 and grant SA 1868/2-1; http://dfg.de). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.