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Investigation of the host transcriptional response to intracellular bacterial infection using Dictyostelium discoideum as a host model
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute. Uppsala University, Sweden.
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Number of Authors: 112019 (English)In: BMC Genomics, ISSN 1471-2164, E-ISSN 1471-2164, Vol. 20, no 1, article id 961Article in journal (Refereed) Published
Abstract [en]

Background: During infection by intracellular pathogens, a highly complex interplay occurs between the infected cell trying to degrade the invader and the pathogen which actively manipulates the host cell to enable survival and proliferation. Many intracellular pathogens pose important threats to human health and major efforts have been undertaken to better understand the host-pathogen interactions that eventually determine the outcome of the infection. Over the last decades, the unicellular eukaryote Dictyostelium discoideum has become an established infection model, serving as a surrogate macrophage that can be infected with a wide range of intracellular pathogens. In this study, we use high-throughput RNA-sequencing to analyze the transcriptional response of D. discoideum when infected with Mycobacterium marinum and Legionella pneumophila. The results were compared to available data from human macrophages.

Results: The majority of the transcriptional regulation triggered by the two pathogens was found to be unique for each bacterial challenge. Hallmark transcriptional signatures were identified for each infection, e.g. induction of endosomal sorting complexes required for transport (ESCRT) and autophagy genes in response to M. marinum and inhibition of genes associated with the translation machinery and energy metabolism in response to L. pneumophila. However, a common response to the pathogenic bacteria was also identified, which was not induced by non-pathogenic food bacteria. Finally, comparison with available data sets of regulation in human monocyte derived macrophages shows that the elicited response in D. discoideum is in many aspects similar to what has been observed in human immune cells in response to Mycobacterium tuberculosis and L. pneumophila.

Conclusions: Our study presents high-throughput characterization of D. discoideum transcriptional response to intracellular pathogens using RNA-seq. We demonstrate that the transcriptional response is in essence distinct to each pathogen and that in many cases, the corresponding regulation is recapitulated in human macrophages after infection by mycobacteria and L. pneumophila. This indicates that host-pathogen interactions are evolutionary conserved, derived from the early interactions between free-living phagocytic cells and bacteria. Taken together, our results strengthen the use of D. discoideum as a general infection model.

Place, publisher, year, edition, pages
2019. Vol. 20, no 1, article id 961
Keywords [en]
Host-pathogen, Infection, High-throughput sequencing, Mycobacteria, Legionella, Dictyostelium discoideum, Macrophage, Infection model, Pathogenic bacteria, Intracellular pathogen
National Category
Biological Sciences Microbiology in the medical area
Identifiers
URN: urn:nbn:se:su:diva-178682DOI: 10.1186/s12864-019-6269-xISI: 000508019700003PubMedID: 31823727OAI: oai:DiVA.org:su-178682DiVA, id: diva2:1393260
Available from: 2020-02-14 Created: 2020-02-14 Last updated: 2020-02-14Bibliographically approved

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