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Hijacking of host cellular functions by an intracellular parasite, the microsporidian Anncaliia algerae

Lookup NU author(s): Dr Johan Panek

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Intracellular pathogens including bacteria, viruses and protozoa hijack host cell functions to access nutrients and to bypass cellular defenses and immune responses. These strategies have been acquired through selective pressure and allowed pathogens to reach an appropriate cellular niche for their survival and growth. To get new insights on how parasites hijack host cellular functions, we developed a SILAC (Stable Isotope Labeling by Amino Acids in Cell culture) quantitative proteomics workflow. Our study focused on deciphering the cross-talk in a host-parasite association, involving human foreskin fibroblasts (HFF) and the microsporidia Anncaliia algerae, a fungus related parasite with an obligate intracellular lifestyle and a strong host dependency. The host-parasite cross-talk was analyzed at five post-infection times 1, 6, 12 and 24 hours post-infection (hpi) and 8 days post-infection (dpi). A significant up-regulation of four interferon-induced proteins with tetratricopeptide repeats IFIT1, IFIT2, IFIT3 and MX1 was observed at 8 dpi suggesting a type 1 interferon (IFN) host response. Quantitative alteration of host proteins involved in biological functions such as signaling (STAT1, Ras) and reduction of the translation activity (EIF3) confirmed a host type 1 IFN response. Interestingly, the SILAC approach also allowed the detection of 148 A. algerae proteins during the kinetics of infection. Among these proteins many are involved in parasite proliferation, and an over-representation of putative secreted effectors proteins was observed. Finally our survey also suggests that A. algerae could use a transposable element as a lure strategy to escape the host innate immune system.


Publication metadata

Author(s): Panek J, El Alaoui H, Mone A, Urbach S, Demettre E, Texier C, Brun C, Zanzoni A, Peyretaillade E, Parisot N, Lerat E, Peyret P, Delbac F, Biron DG

Publication type: Article

Publication status: Published

Journal: PLoS ONE

Year: 2014

Volume: 9

Pages: e100791

Print publication date: 26/06/2014

Online publication date: 26/06/2014

Acceptance date: 29/05/2014

Date deposited: 19/07/2019

ISSN (electronic): 1932-6203

Publisher: Public Library of Science

URL: https://doi.org/10.1371/journal.pone.0100791

DOI: 10.1371/journal.pone.0100791


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