Additional oxidative stress reroutes the global response of Aspergillus fumigatus to iron depletion
Abstract Background Aspergillus fumigatus has to cope with a combination of several stress types while colonizing the human body. A functional interplay between these different stress responses can increase the chances of survival for this opportunistic human pathogen during the invasion of its host...
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| Format: | Article |
| Language: | English |
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BMC
2018-05-01
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| Series: | BMC Genomics |
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| Online Access: | http://link.springer.com/article/10.1186/s12864-018-4730-x |
| _version_ | 1818384609211056128 |
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| author | Vivien Kurucz Thomas Krüger Károly Antal Anna-Maria Dietl Hubertus Haas István Pócsi Olaf Kniemeyer Tamás Emri |
| author_facet | Vivien Kurucz Thomas Krüger Károly Antal Anna-Maria Dietl Hubertus Haas István Pócsi Olaf Kniemeyer Tamás Emri |
| author_sort | Vivien Kurucz |
| collection | DOAJ |
| description | Abstract Background Aspergillus fumigatus has to cope with a combination of several stress types while colonizing the human body. A functional interplay between these different stress responses can increase the chances of survival for this opportunistic human pathogen during the invasion of its host. In this study, we shed light on how the H2O2-induced oxidative stress response depends on the iron available to this filamentous fungus, using transcriptomic analysis, proteomic profiles, and growth assays. Results The applied H2O2 treatment, which induced only a negligible stress response in iron-replete cultures, deleteriously affected the fungus under iron deprivation. The majority of stress-induced changes in gene and protein expression was not predictable from data coming from individual stress exposure and was only characteristic for the combination of oxidative stress plus iron deprivation. Our experimental data suggest that the physiological effects of combined stresses and the survival of the fungus highly depend on fragile balances between economization of iron and production of essential iron-containing proteins. One observed strategy was the overproduction of iron-independent antioxidant proteins to combat oxidative stress during iron deprivation, e.g. the upregulation of superoxide dismutase Sod1, the thioredoxin reductase Trr1, and the thioredoxin orthologue Afu5g11320. On the other hand, oxidative stress induction overruled iron deprivation-mediated repression of several genes. In agreement with the gene expression data, growth studies underlined that in A. fumigatus iron deprivation aggravates oxidative stress susceptibility. Conclusions Our data demonstrate that studying stress responses under separate single stress conditions is not sufficient to understand how A. fumigatus adapts in a complex and hostile habitat like the human body. The combinatorial stress of iron depletion and hydrogen peroxide caused clear non-additive effects upon the stress response of A. fumigatus. Our data further supported the view that the ability of A. fumigatus to cause diseases in humans strongly depends on its fitness attributes and less on specific virulence factors. In summary, A. fumigatus is able to mount and coordinate complex and efficient responses to combined stresses like iron deprivation plus H2O2-induced oxidative stress, which are exploited by immune cells to kill fungal pathogens. |
| first_indexed | 2024-12-14T03:24:59Z |
| format | Article |
| id | doaj.art-6e33c209a3114203a8184574aeba1696 |
| institution | Directory Open Access Journal |
| issn | 1471-2164 |
| language | English |
| last_indexed | 2024-12-14T03:24:59Z |
| publishDate | 2018-05-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Genomics |
| spelling | doaj.art-6e33c209a3114203a8184574aeba16962022-12-21T23:18:55ZengBMCBMC Genomics1471-21642018-05-0119111910.1186/s12864-018-4730-xAdditional oxidative stress reroutes the global response of Aspergillus fumigatus to iron depletionVivien Kurucz0Thomas Krüger1Károly Antal2Anna-Maria Dietl3Hubertus Haas4István Pócsi5Olaf Kniemeyer6Tamás Emri7Department of Biotechnology and Microbiology, Faculty of Sciences and Technology, University of DebrecenMolecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology – Hans Knöll Institute (HKI)Department of Zoology, Faculty of Sciences, Eszterházy Károly UniversityDivision of Molecular Biology, Biocenter, Medical University of InnsbruckDivision of Molecular Biology, Biocenter, Medical University of InnsbruckDepartment of Biotechnology and Microbiology, Faculty of Sciences and Technology, University of DebrecenMolecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology – Hans Knöll Institute (HKI)Department of Biotechnology and Microbiology, Faculty of Sciences and Technology, University of DebrecenAbstract Background Aspergillus fumigatus has to cope with a combination of several stress types while colonizing the human body. A functional interplay between these different stress responses can increase the chances of survival for this opportunistic human pathogen during the invasion of its host. In this study, we shed light on how the H2O2-induced oxidative stress response depends on the iron available to this filamentous fungus, using transcriptomic analysis, proteomic profiles, and growth assays. Results The applied H2O2 treatment, which induced only a negligible stress response in iron-replete cultures, deleteriously affected the fungus under iron deprivation. The majority of stress-induced changes in gene and protein expression was not predictable from data coming from individual stress exposure and was only characteristic for the combination of oxidative stress plus iron deprivation. Our experimental data suggest that the physiological effects of combined stresses and the survival of the fungus highly depend on fragile balances between economization of iron and production of essential iron-containing proteins. One observed strategy was the overproduction of iron-independent antioxidant proteins to combat oxidative stress during iron deprivation, e.g. the upregulation of superoxide dismutase Sod1, the thioredoxin reductase Trr1, and the thioredoxin orthologue Afu5g11320. On the other hand, oxidative stress induction overruled iron deprivation-mediated repression of several genes. In agreement with the gene expression data, growth studies underlined that in A. fumigatus iron deprivation aggravates oxidative stress susceptibility. Conclusions Our data demonstrate that studying stress responses under separate single stress conditions is not sufficient to understand how A. fumigatus adapts in a complex and hostile habitat like the human body. The combinatorial stress of iron depletion and hydrogen peroxide caused clear non-additive effects upon the stress response of A. fumigatus. Our data further supported the view that the ability of A. fumigatus to cause diseases in humans strongly depends on its fitness attributes and less on specific virulence factors. In summary, A. fumigatus is able to mount and coordinate complex and efficient responses to combined stresses like iron deprivation plus H2O2-induced oxidative stress, which are exploited by immune cells to kill fungal pathogens.http://link.springer.com/article/10.1186/s12864-018-4730-xAspergillus fumigatusCombinatorial stressIron deprivationOxidative stressProteomicsStress response |
| spellingShingle | Vivien Kurucz Thomas Krüger Károly Antal Anna-Maria Dietl Hubertus Haas István Pócsi Olaf Kniemeyer Tamás Emri Additional oxidative stress reroutes the global response of Aspergillus fumigatus to iron depletion BMC Genomics Aspergillus fumigatus Combinatorial stress Iron deprivation Oxidative stress Proteomics Stress response |
| title | Additional oxidative stress reroutes the global response of Aspergillus fumigatus to iron depletion |
| title_full | Additional oxidative stress reroutes the global response of Aspergillus fumigatus to iron depletion |
| title_fullStr | Additional oxidative stress reroutes the global response of Aspergillus fumigatus to iron depletion |
| title_full_unstemmed | Additional oxidative stress reroutes the global response of Aspergillus fumigatus to iron depletion |
| title_short | Additional oxidative stress reroutes the global response of Aspergillus fumigatus to iron depletion |
| title_sort | additional oxidative stress reroutes the global response of aspergillus fumigatus to iron depletion |
| topic | Aspergillus fumigatus Combinatorial stress Iron deprivation Oxidative stress Proteomics Stress response |
| url | http://link.springer.com/article/10.1186/s12864-018-4730-x |
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