Mucosal surfaces must allow the exchange of metabolites required for life into the host and excretion/exclusion of wastes and toxins out of the host, while also maintaining a first line of defense against invasive microbes. However, mucosal inflammation, elicited to combat microbial infection, can also damage the integrity of the mucosal barrier, if not controlled. Many mucosal surfaces are in constant or transient contact with microbes, yet the molecular mechanisms governing the extent of the inflammatory response at the mucosal surface and the molecular basis of a protective adaptive mucosal response are poorly understood. This proposal will investigate these mechanisms by assembling an experienced team of investigators with diverse and complimentary expertise to investigate the mucosal immune defense mechanisms of the urinary bladder against bacterial infection. We will test the hypothesis that the integration of immune signaling pathways within the first few hours of bacterial infection, including those from the bladder epithelium, constitute a mucosal immune checkpoint that has a profound impact upon the outcome of disease and bladder mucosal remodeling. The proposed research will utilize a simple and highly tractable murine model of lower urinary tract bacterial infection to probe these immune defense pathways of the bladder mucosa during acute, chronic and recurrent infection. The experimental approaches proposed will provide critical insights in the field of mucosal immunology. These studies will investigate the role of specific innate signaling pathways (Aim 1) and cellular responses (Aim 2) early in acute infection of naive mice, and the role of adaptive changes such as chronic inflammatory cell infiltrates and IgA production in establishing sensitivity to or protection from recurrent infection (Aim 3). These investigations will reveal new details of the mechanisms of mucosal defense against bacteria, broadening the understanding of the regulation of mucosal inflammation and the signaling between mucosal epithelia and immune cells, and thus advance our understanding of chronic and recurrent infection susceptibility and protection. These insights will contribute to the development of novel vaccines and therapeutics targeting the mucosa.

Public Health Relevance

These experiments are designed to reveal new mechanisms of mucosal defense against bacteria. Such findings would advance our understanding of both protective and damaging inflammatory responses at the mucosa, potentially contributing to the design of vaccines and raising new avenues for therapeutic intervention in chronic inflammatory conditions of the mucosa.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project--Cooperative Agreements (U01)
Project #
5U01AI095542-03
Application #
8496697
Study Section
Special Emphasis Panel (ZAI1-WFD-I (M2))
Program Officer
Rothermel, Annette L
Project Start
2011-07-01
Project End
2016-06-30
Budget Start
2013-07-01
Budget End
2014-06-30
Support Year
3
Fiscal Year
2013
Total Cost
$425,218
Indirect Cost
$145,469
Name
Washington University
Department
Pathology
Type
Schools of Medicine
DUNS #
068552207
City
Saint Louis
State
MO
Country
United States
Zip Code
63130
Colonna, Marco (2018) Innate Lymphoid Cells: Diversity, Plasticity, and Unique Functions in Immunity. Immunity 48:1104-1117
Cervantes-Barragan, Luisa; Colonna, Marco (2018) Chemical sensing in development and function of intestinal lymphocytes. Curr Opin Immunol 50:112-116
Bando, Jennifer K; Gilfillan, Susan; Song, Christina et al. (2018) The Tumor Necrosis Factor Superfamily Member RANKL Suppresses Effector Cytokine Production in Group 3 Innate Lymphoid Cells. Immunity 48:1208-1219.e4
Robinette, M L; Cella, M; Telliez, J B et al. (2018) Jak3 deficiency blocks innate lymphoid cell development. Mucosal Immunol 11:50-60
Kalas, Vasilios; Pinkner, Jerome S; Hannan, Thomas J et al. (2017) Evolutionary fine-tuning of conformational ensembles in FimH during host-pathogen interactions. Sci Adv 3:e1601944
Cortez, Victor S; Ulland, Tyler K; Cervantes-Barragan, Luisa et al. (2017) SMAD4 impedes the conversion of NK cells into ILC1-like cells by curtailing non-canonical TGF-? signaling. Nat Immunol 18:995-1003
Cervantes-Barragan, Luisa; Chai, Jiani N; Tianero, Ma Diarey et al. (2017) Lactobacillus reuteri induces gut intraepithelial CD4+CD8??+ T cells. Science 357:806-810
Schreiber 4th, Henry L; Conover, Matt S; Chou, Wen-Chi et al. (2017) Bacterial virulence phenotypes of Escherichia coli and host susceptibility determine risk for urinary tract infections. Sci Transl Med 9:
Bando, Jennifer K; Colonna, Marco (2016) Innate lymphoid cell function in the context of adaptive immunity. Nat Immunol 17:783-9
Cortez, Victor S; Colonna, Marco (2016) Diversity and function of group 1 innate lymphoid cells. Immunol Lett 179:19-24

Showing the most recent 10 out of 39 publications