%0 Journal Article %T Pseudomonas aeruginosa interacts with epithelial cells rapidly forming aggregates that are internalized by a Lyn-dependent mechanism. %+ Institut Pasteur de Montevideo %+ Department of Anatomy %+ Department of Biochemistry and Biophysics %A Lepanto, Paola %A Bryant, David M %A Rossello, Jéssica %A Datta, Anirban %A Mostov, Keith E %A Kierbel, Arlinet %Z This work was supported by Grant Number R03TW008056 from the Fogarty International Center, by Agencia Nacional de Investigación e Innovación (ANII) Program INNOVA URUGUAY-DCI- ALA/2007/19.040 URU-UE, FCE-2007 (A.K.), Sistema Nacional de Becas (P.L.) and by NIH grant 5P01 AI53194 (K.E.M.). %< avec comité de lecture %@ 1462-5814 %J Cellular Microbiology %I Wiley %V 13 %N 8 %P 1212-22 %8 2011-08 %D 2011 %R 10.1111/j.1462-5822.2011.01611.x %M 21615664 %Z Life Sciences [q-bio]/Cellular Biology %Z Life Sciences [q-bio]/Microbiology and ParasitologyJournal articles %X Growing evidence is pointing to the importance of multicellular bacterial structures in the interaction of pathogenic bacteria with their host. Transition from planktonic to host cell-associated multicellular structures is an essential infection step that has not been described for the opportunistic human pathogen Pseudomonas aeruginosa. In this study we show that P. aeruginosa interacts with the surface of epithelial cells mainly forming aggregates. Dynamics of aggregate formation typically follow a sigmoidal curve. First, a single bacterium attaches at cell-cell junctions. This is followed by rapid recruitment of free-swimming bacteria and association of bacterial cells resulting in the formation of an aggregate on the order of minutes. Aggregates are associated with phosphatidylinositol 3,4,5-trisphosphate (PIP3)-enriched host cell membrane protrusions. We further show that aggregates can be rapidly internalized into epithelial cells. Lyn, a member of the Src family tyrosine kinases previously implicated in P. aeruginosa infection, mediates both PIP3-enriched protrusion formation and aggregate internalization. Our results establish the first framework of principles that define P. aeruginosa transition to multicellular structures during interaction with host cells. %G English %L pasteur-00685066 %U https://riip.hal.science/pasteur-00685066 %~ RIIP %~ RIIP_MONTEVIDEO