Abstract:
:Pulmonary mucosal immune response is critical for preventing opportunistic Aspergillus fumigatus infections. Although fungus-specific CD4+ T cells in blood are described to reflect the actual host-pathogen interaction status, little is known about Aspergillus-specific pulmonary T-cell responses. Here, we exploit the domestic pig as human-relevant large animal model and introduce antigen-specific T-cell enrichment in pigs to address Aspergillus-specific T cells in the lung compared to peripheral blood. In healthy, environmentally Aspergillus-exposed pigs, the fungus-specific T cells are detectable in blood in similar frequencies as observed in healthy humans and exhibit a Th1 phenotype. Exposing pigs to 106 cfu/m3 conidia induces a long-lasting accumulation of Aspergillus-specific Th1 cells locally in the lung and also systemically. Temporary immunosuppression during Aspergillus-exposure showed a drastic reduction in the lung-infiltrating antifungal T-cell responses more than 2 weeks after abrogation of the suppressive treatment. This was reflected in blood, but to a much lesser extent. In conclusion, by using the human-relevant large animal model the pig, this study highlights that the blood clearly reflects the mucosal fungal-specific T-cell reactivity in environmentally exposed as well as experimentally exposed healthy pigs. But, immunosuppression significantly impacts the mucosal site in contrast to the initial systemic immune response.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Schmidt S,Ebner F,Rosen K,Kniemeyer O,Brakhage AA,Löffler J,Seif M,Springer J,Schlosser J,Scharek-Tedin L,Scheffold A,Bacher P,Kühl AA,Rösler U,Hartmann Sdoi
10.1002/eji.201948524subject
Has Abstractpub_date
2020-11-01 00:00:00pages
1712-1728issue
11eissn
0014-2980issn
1521-4141journal_volume
50pub_type
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