Clostridium difficile infection (CDI) is a significant cause of morbidity and mortality. Disease related to CDI ranges from asymptomatic colonization to mild diarrheal disease to severe pseudomembranous colifis. Despite the extensive characterizafion of the histologic lesions associated with C. difficile infection, virtually nothing is known mechanistically about the contribution of host factors in disease. It is likely that some of the clinical differences encountered in infected individuals are due to variafion in host response to colonization with C. difficile. We hypothesize that variation in the host innate and adaptive responses for C. difficile are in part responsible for the different clinical phenotypes that are seen in the setting of CDI. Furthermore, we speculate that these variable responses reflect underiying genetic and possibly epigenetic differences in the host. To address these hypotheses we propose the following specific aims: In the first aim we will characterize the innate and adaptive immune response to C. difficile colonization and determine the role of this response in determining the disease manifestations. In the second aim we will identify serum fecal biomarkers and epigenetic changes that correlate distinct clinical outcomes.
This aim will examine samples obtained from the Project area #1 for this purpose.
The third aim will examine the interaction between host genetics/immune response and C. difficile genotype in the pathogenesis of disease. Mice with defined differences in host response will be challenged with C. difficile strains generated and characterized from the human studies in Project area #1. This will provide an examinafion ofthe relative contribution of host and pathogen factors in disease. These experiments will increase our understanding ofthe host and microbial mechanisms of C. d/Wc/Ve-induced colonic inflammation vs. asymptomatic colonization and identify biomarkers that can be used to improve clinical treatments and outcomes.

Public Health Relevance

Clostridium difficile infection is associated with the development of severe inflammation ofthe large intestine, resulting in signiflcant morbidity and mortality. Our objective is to understand the mechanisms of this inflammation and identify biomarkers that can be used to improve clinical treatments and outcomes.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program--Cooperative Agreements (U19)
Project #
5U19AI090871-03
Application #
8380600
Study Section
Special Emphasis Panel (ZAI1-BLG-M)
Project Start
Project End
Budget Start
2012-08-01
Budget End
2013-07-31
Support Year
3
Fiscal Year
2012
Total Cost
$442,418
Indirect Cost
$157,802
Name
University of Michigan Ann Arbor
Department
Type
DUNS #
073133571
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109
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