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ERK activation waves coordinate mechanical cell competition leading to collective onslaught of bacterially-infected cells

ABSTRACT: In this study, we investigated how biochemical signaling, and in particular extracellular signal-regulated kinase (ERK) activity waves, coordinate the mechanical battle between Listeria monocytogenes infected and surrounder uninfected epithelial cells. We explored the collective infected cell extrusion using live-cell imaging, proteomics, atomic force microscopy (AFM), traction force microscopy (TFM) and additional approaches.

INSTRUMENT(S):

ORGANISM(S): Listeria Monocytogenes Canis Familiaris (dog) (canis Lupus Familiaris)

SUBMITTER: Ana Velic

LAB HEAD: Effie Bastounis

PROVIDER: PXD055809 | Pride | 2024-12-18

REPOSITORIES: Pride

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			Action	DRS
	20230915_CO_1117EfBa_mix_01_R02R03_Phospho_Cycle_01.raw	Raw
	20230915_CO_1117EfBa_mix_01_R02R03_Phospho_Cycle_02.raw	Raw
	20230915_CO_1117EfBa_mix_01_R02R03_Proteome.raw	Raw
	20230915_CO_1117EfBa_mix_02_R04R05_Phospho_Cycle_01.raw	Raw
	20230915_CO_1117EfBa_mix_02_R04R05_Phospho_Cycle_02.raw	Raw

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Project description:Objective: Reg3g has been proposed to have a protective role against infection due to its bactericidal effect on Gram-positive bacteria, but evidence from in vivo studies is lacking. Therefore we generated a Reg3g-/- mouse, to determine its role in intestinal homeostasis and protection against experimental infection. Methods: Reg3g-/- mice were phenotyped using histological methods and a range of innate and immune markers. To investigate the antimicrobial role of Reg3g we experimentally infected mice with Gram-positive Listeria monocytogenes and Gram-negative Salmonella entertitidis and measured translocated bacteria, mucosal and systemic markers of infection. Results: Reg3g-/- mice display altered ileal mucus distribution and increased bacterial contact with the epithelium. , concomitant with This increased the inflammatory status in of the ileal mucosa and increased expression of Il-22, myeloperoxidase (MPO) and serum chemokines in serum. In response to infection, Reg3g-/- mice showed transcriptome changes and elevated levels of mucosal MPO in the ileum, but no increased bacterial translocation to the organs. Conclusions: Reg3g is equally distributed throughout the mucus of wild type (wt) mice and its absence results in an altered distribution of the ileal mucus. Reg3g deficiency also results resulted in increased bacterial contact with the epithelium and heightened inflammatory responses in the ileal mucosa. We propose that Reg3g binds pathogens suggesting it and contributes to mucus barrier function by ensnaring bacteria. Compared to wt mice, Reg3g-/- mice infected with S. enteritidis and L. monocytogenes show an increase of mucosal inflammatory markers indicating the protective, anti-microbial roles of Reg3g in defence against both Gram-positive and -negative bacteria. This study was set up according to a one-treatment, one-control design; treatments were inoculation with either Listeria monocytogenes or Salmonella enteritidis bacterial pathogens. The study results contain transcriptional profiles from infected and sham-infected control C57Bl/6 mice. In total, this study includes data from 2 treatments and 1 control of (pooled) wild-type C57Bl/6 mice and Reg3g-/- KO mutant C57Bl/6 mice = 6 arrays.

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ERK activation waves coordinate mechanical cell competition leading to collective onslaught of bacterially-infected cells

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