Healthy, Irritable Bowel Syndrome
Conditions
Brief summary
Selective serotonin reuptake inhibitors increase the level of serotonin. This study will use functional magnetic resonance imaging to examine how subjects with, and without, irritable bowel syndrome patients respond to serotonergic stimulation. Brain activation during emotional and arithmetic tasks and during visceral pain will be measured after serotonergic stimulation using the oral administration of Escitalopram (10 mg). The investigators will further integrate background parameters of the irritable bowel syndrome subjects and healthy controls (such as microbiota composition, genetic markers of serotonergic and inflammatory pathways, intestinal permeability, state of mood and visceral sensitivity) with the responses to the various challenges on the level of functional brain imaging. These responses may reveal a 'footprint' of the individual gut-brain axis function. Analyses of these individual footprints in multiple subjects with and without irritable bowel syndrome may reveal biosignatures characterising certain groups of patients according to specific gut-brain signalling response patterns. These biosignatures may be used to develop an individualised treatment algorithm for irritable bowel syndrome therapy.
Detailed description
In this double-blinded, randomized, cross-over study, irritable bowel syndrome subjects (n = 40) and healthy controls (n = 20) will perform an emotional and the arithmetic task and receive visceral stimuli (by using a barostat) while placed in a functional magnetic resonance imaging scanner respectively during two different states, a) after oral administration of 10 mg Escitalopram, a well-known drug classified as Selective Serotonin Reuptake Inhibitor, packed in a coloured hydroxypropylmethylcellulose capsule, and b) during oral administration of a placebo, in a double-blinded randomized cross-over fashion. Background characteristics will be collected.
Interventions
OTHERserotonergic stimulation
Increase of serotonergic activity by a single oral administration of 10 mg Escitalopram, a Selective Serotonin Reuptake Inhibitor (SSRI), packed in a coloured hydroxypropylmethylcellulose capsule.
OTHERno serotonergic stimulation
Oral administration of a placebo. The placebo will consist of a coloured hydroxypropylmethylcellulose capsule filled with microcrystalline cellulose.
Sponsors
Region Örebro County
Örebro University, Sweden
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
BASIC_SCIENCE
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes
Inclusion criteria
for the irritable bowel syndrome group: 1. Subjects fulfill Rome IV diagnostic criteria for irritable bowel syndrome and pain frequency for at least 1 day per week in the last 12 weeks 2. Males or females aged 18-65 years 3. Signed informed consent
Exclusion criteria
for the irritable bowel syndrome group: 1. Concurrent or recent treatment with drugs affecting intestinal microbiota, function or mood, e.g., antidepressants (\< 12 weeks), antibiotics (\< 12 weeks) 2. Concurrent or recent (\< 4 weeks) use of nutritional supplements or herb products affecting intestinal function or mood (e.g. aloe vera, St. John´s Wort and probiotics) 3. Diagnosis of major psychiatric or somatic disease other than part of irritable bowel syndrome 4. Suicidal tendencies according to Montgomery Åsberg Depression Ratings Scale and/or clinical judgment 5. Abuse of alcohol or drugs according to Alcohol Use Disorders Identification Test, and/or clinical judgment 6. Recent (\< 4 weeks) intake of proton pump inhibitors (e.g., omeprazole) 7. Epilepsy 8. Cerebral bleeding or history of cerebral bleeding 9. Pregnancy or breastfeeding (will be asked) 10. Claustrophobia 11. Smoking or using tobacco including snuff 12. Dominant left-hand 13. Medical implant (e.g., pacemaker) 14. Aneurysm clips in the head 15. Shunts in the head 16. Grenade-splinter or metal-splinter in the body (e.g., eyes) 17. Metal or electrodes in the body (e.g., temp-catheter, aorta stent, cochlear implant) 18. Comprehensive tooth-implants or prothesis 19. Operated in the head 20. Operated in the heart 21. Swallowed a video-capsule 22. Non-corrected astigmatism 23. Regular intake of antiinflammatory medication (including non-steroidal antiinflammatory drugs) 24. Visual defect without possibility to use lenses during functional magnetic resonance imaging scanning 25. Any other reason the investigator feels the subject is not suitable for participation in the study Inclusion criteria for healthy group: 1. Males and females aged 18-65 years of age 2. Signed informed consent
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Differences in functional brain response pattern to the barostat in stimulated compared to unstimulated serotonergic activity | 1 week | functional magnetic resonance imaging |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Differences in functional brain response pattern to the Montreal Imaging Stress Task between stimulated and unstimulated serotonergic activity | 1 week | functional magnetic resonance imaging |
| Differences in functional brain response pattern to the Emotional Attention Task between stimulated and unstimulated serotonergic activity | 1 week | functional magnetic resonance imaging |
| Differences in functional brain response pattern to the barostat stimulus paradigm between irritable bowel syndrome patients and healthy controls for stimulated and unstimulated serotonergic activity | 1 week | functional magnetic resonance imaging |
| Differences in functional brain response pattern to the Montreal imaging stress task (MIST) between irritable bowel syndrome patients and healthy controls for stimulated and unstimulated serotonergic activity | 1 week | functional magnetic resonance imaging |
| Differences in functional brain response pattern to the emotional attention task (EAT) between irritable bowel syndrome patients and healthy controls for stimulated and unstimulated serotonergic activity | 1 week | functional magnetic resonance imaging |
Countries
Sweden
Outcome results
None listed