Urinary tract infections (UTIs) are common, drive extensive antibiotic use, and are becoming increasingly resistant to treatment. There is general agreement that urinary chemical composition influences UTI pathogenesis, but this has been difficult to translate to clinical practice. Clinical urinary pathogens possess numerous genetic adaptations to the urinary environment, suggesting multiple selective pressures related to urinary composition. Recently, we identified individual differences in urine's ability to support antibacterial iron chelation by the innate immune protein siderocalin (SCN; also known as Lipocalin-2 or NGAL). Using mass spectrometry-based metabolomics and biochemical hypothesis-testing, we have mechanistically linked these differences to a specific chemical class of human urinary metabolites. Here we will identify human urinary metabolomic influences on SCN activity and other aspects of UTI pathogenesis. Because human urine is chemically complex, we will combine recent bioanalytical advances with contemporary data science approaches to identify metabolomic networks that influence bacterial growth and behavior. Our objective is to identify networks associated with SCN activity and bacterial growth, explore their mechanism(s) of action, and learn their physiologic origins as a basis for new prophylactic and therapeutic strategies. The proposed analyses and experiments are a rigorous initial evaluation of the hypothesis that urinary composition influences infection susceptibility and can be modified as a non-antibiotic therapy.

Public Health Relevance

In many individuals, preventing urinary tract infections (UTIs) is difficult. Rising antibiotic resistance among bacteria that cause UTI is also making treatment more difficult. We will explore new approaches to UTI therapy by learning how human urinary metabolites help some individuals resist UTI.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK111930-02
Application #
9618198
Study Section
Host Interactions with Bacterial Pathogens Study Section (HIBP)
Program Officer
Bavendam, Tamara G
Project Start
2017-12-26
Project End
2021-11-30
Budget Start
2018-12-01
Budget End
2019-11-30
Support Year
2
Fiscal Year
2019
Total Cost
Indirect Cost
Name
Washington University
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
068552207
City
Saint Louis
State
MO
Country
United States
Zip Code
63130
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Robinson, Anne E; Heffernan, James R; Henderson, Jeffrey P (2018) The iron hand of uropathogenic Escherichia coli: the role of transition metal control in virulence. Future Microbiol 13:745-756