Clinical Trial: A Pilot Study to Characterize Bile Acid Metabolism and Dysbiosis in Primary Sclerosing Cholangitis

Study Status: Active, not recruiting
Recruit Status: Active, not recruiting
Study Type: Interventional

Official Title: A Pilot Study to Characterize Bile Acid Metabolism and Dysbiosis in Primary Sclerosing Cholangitis

Brief Summary: The goal of this study is to assess if oral vancomycin can restore the normal bile acid metabolism of people with Primary Sclerosing Cholangitis and Inflammatory Bowel Disease. Study participants will provide blood and stool samples in order to evaluate the bile acid metabolism before a short course of vancomycin and then again after to assess for change. The investigators will also assess the blood and stool of healthy people, and people with IBD (without PSC) as a control group.

Detailed Summary:

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.


Sponsor: University of Minnesota - Clinical and Translational Science Institute

Current Primary Outcome: 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


Original Primary Outcome: Same as current

Current Secondary Outcome: 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.


Original Secondary Outcome: Same as current

Information By: University of Minnesota - Clinical and Translational Science Institute

Dates:
Date Received: May 29, 2015
Date Started: July 2015
Date Completion: December 2017
Last Updated: May 17, 2017
Last Verified: May 2017