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Rck of Salmonella Typhimurium Delays the Host Cell Cycle to Facilitate Bacterial Invasion

Abstract : Salmonella Typhimurium expresses on its outer membrane the protein Rck which interacts with the epidermal growth factor receptor (EGFR) of the plasma membrane of the targeted host cells. This interaction activates signaling pathways, leading to the internalization of Salmonella. Since EGFR plays a key role in cell proliferation, we sought to determine the influence of Rck mediated infection on the host cell cycle. By analyzing the DNA content of uninfected and infected cells using flow cytometry, we showed that the Rck-mediated infection induced a delay in the S-phase (DNA replication phase) of the host cell cycle, independently of bacterial internalization. We also established that this Rck-dependent delay in cell cycle progression was accompanied by an increased level of host DNA double strand breaks and activation of the DNA damage response. Finally, we demonstrated that the S-phase environment facilitated Rck-mediated bacterial internalization. Consequently, our results suggest that Rck can be considered as a cyclomodulin with a genotoxic activity.
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Contributor : Olivier Grépinet <>
Submitted on : Monday, December 7, 2020 - 6:43:27 PM
Last modification on : Friday, June 4, 2021 - 2:40:20 PM


Distributed under a Creative Commons Attribution 4.0 International License

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Julien Mambu, Emilie Barilleau, Laëtitia Fragnet-Trapp, Yves Le Vern, Michel Olivier, et al.. Rck of Salmonella Typhimurium Delays the Host Cell Cycle to Facilitate Bacterial Invasion. Frontiers in Cellular and Infection Microbiology, Frontiers, 2020, 10, 15 p. ⟨10.3389/fcimb.2020.586934⟩. ⟨hal-03044647⟩



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