Measuring Nerve Activity in Small Human Intestinal Biopsies in IBS (Irritable Bowel Syndrome)
Rectal biopsies from IBS patients or healthy subjects will be taken.
Biopsies will be used for:
- the isolation of submucosal plexus to perform: 1.1 live nerve recordings and Calcium imaging; 1.2 immunohistochemistry; 1.3 mRNA (Messenger ribonucleic acids) isolation and real time PCR (Polymerase chain reaction);
- culturing biopsies
On the basis of these observations, the general aim of the study is to move a significant step forward in the current knowledge on human ENS (enteric nervous system) in IBS by establishing a live imaging method to record enteric nerves activity in small intestinal biopsies from humans. This development is unique in its kind as not other research groups have reported successful live recordings with calcium imaging in this preparation.
In particular, the investigators aim:
- to develop and validate the technique to measure activity in human enteric nerves in the submucous plexus isolated from rectal biopsies from healthy subjects and IBS patients;
- to characterize this nerve activity in healthy subjects and IBS patients using both calcium imaging to evaluate the effect of different neuromodulators, immunohistochemistry and rtPCR to determine receptor expression levels and identify neurons and glial cells in the submucous ganglia;
- to investigate whether the biopsies of IBS patients secrete more modulators/cytokines compared to healthy subjects and their potential to activate neurons.
- to evaluate the influence of different food constituents (cow‟s milk, wheat, yeast, gluten and soy) on the local reaction of the rectal mucosa and evaluate mast cell activation/degranulation in biopsies of IBS patients compared to healthy subjects.
- To evaluate the amount of inflammatory mediators/metabolites in urine samples of IBS patients and healthy volunteers by the use of metabolic profiling
Procedure: Rectal biopsies from IBS patients or healthy subjects will be taken during proctoscopy
|Study Design:||Intervention Model: Single Group Assignment
Masking: No masking
Primary Purpose: Basic Science
|Official Title:||Measuring Nerve Activity in Small Human Intestinal Biopsies in IBS (Irritable Bowel Syndrome)|
- nerve activity in healthy subjects and IBS patients [ Time Frame: Starting from the moment biopsies are collected untill nerve activity in samples is lost (approximately 5 hours) ]Measuring nerve activity in healthy subjects and IBS patients using both calcium imaging to evaluate the effect of different neuromodulators, immunohistochemistry and rtPCR to determine receptor expression levels and identify neurons and glial cells in the submucous ganglia.
|Study Start Date:||August 2013|
|Estimated Study Completion Date:||August 2019|
|Estimated Primary Completion Date:||August 2019 (Final data collection date for primary outcome measure)|
|Experimental: Rectal biopsy||Procedure: Rectal biopsies from IBS patients or healthy subjects will be taken during proctoscopy|
Please refer to this study by its ClinicalTrials.gov identifier: NCT01912313
|Contact: Lien Beullens, MScfirstname.lastname@example.org|
|Contact: Dafne Balemans, MScemail@example.com|
|University Hospitals Leuven||Recruiting|
|Leuven, Vlaams-Brabant, Belgium, 3000|
|Contact: Lien Beullens, MSc 0032-16-341943 firstname.lastname@example.org|
|Contact: Dafne Balemans, MSc 0032-16-330158 email@example.com|
|Principal Investigator:||Guy Boeckxstaens, MD||Catholic University Leuven and Universitary Hospitals Leuven|