A Pilot Study to Characterize Bile Acid Metabolism and Dysbiosis in Primary Sclerosing Cholangitis
|Primary Sclerosing Cholangitis Inflammatory Bowel Disease||Drug: Vancomycin||Phase 4|
|Study Design:||Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: No masking
Primary Purpose: Basic Science
|Official Title:||A Pilot Study to Characterize Bile Acid Metabolism and Dysbiosis in Primary Sclerosing Cholangitis|
- Fecal bile acid composition [ Time Frame: 5 days ]Fecal samples will be collected over 1 week. Bile acids will be measured on each sample and the average composition of primary to secondary bile acids over the 5 day period will be assessed. Comparison will be made pre and post vancomycin
- Microbiome diversity analysis [ Time Frame: 5 days ]Fecal samples collected over the course of a week will be assessed by 16S r-Ribosomal Ribonucleic Acid gene profiling. Intestinal microbial communities will be assessed pre and post vancomycin administration.
|Study Start Date:||July 2015|
|Estimated Study Completion Date:||December 2017|
|Primary Completion Date:||May 2017 (Final data collection date for primary outcome measure)|
Experimental: primary sclerosing cholangitis
Two week course of oral vancomycin 500mg twice a day.
Oral vancomycin: 500mg suspended in prefilled syringes for oral use
No Intervention: Control group
A control group of participants without Primary Sclerosing Cholangitis. Control group will consist of both healthy subjects and subjects with Inflammatory Bowel Disease.
Primary Sclerosing Cholangitis (PSC) is a chronic inflammatory and fibrotic disease of the intra and extrahepatic ducts of unknown etiology that predominately occurs in people with Inflammatory Bowel Disease (IBD). One hypothesis is that altered microbiome (bacteria in the gut) in people with IBD are responsible for the inflammation in the liver seen in PSC. Bile acids (BAs) represent a unique mechanism of communication between the host and intestinal microbiome and the liver. Synthesized in the liver, bile acids are metabolized by intestinal bacteria hydroxylases to secondary BAs which then re-enter the portal circulation. Altered metabolism of BAs has been associated with gallstones and colorectal cancer and is hypothesized to play a role in the inflammatory response of certain disease such as IBD and PSC.
IBD has been associated with impairment of bile acid (BA) metabolism. In addition BAs play a role in regulating bacterial growth of the intestine and thus have an effect on the integrity of the intestinal mucosa, which is an essential component of IBD. Perturbations in this system could increase bacterial translocation into the portal system due to loss of protective mucosal factors or bacterial overgrowth.
The overall goal of this study is to assess the changes in BAs metabolism following administration of oral vancomycin. The investigators will also describe the relationship of the intestinal microbiome and BA metabolism in PSC/IBD.
Please refer to this study by its ClinicalTrials.gov identifier: NCT02464020
|United States, Minnesota|
|University of Minnesota Medical Center|
|Minneapolis, Minnesota, United States, 55455|
|Principal Investigator:||Byron P Vaughn, MD||University of Minnesota - Clinical and Translational Science Institute|