Fiber Fermentation, and Short Chain Fatty Acid Kinetics and Utilization Inside the Gut and Systemic Circulation

NCT04499183 | Unknown

• 1 other identifier: NL74418.081.20
• Study Type: interventional
• Target: 10
• Locations: 1 country
• Sites: 1

Brief Summary

Nowadays there is a strong interest in optimising human health through manipulation of non-digestible carbohydrates (NDC). NDC can be used as substrates by gut microbiota, which results in NDC degradation, production of fermentation products, such as short-chain fatty acids (SCFA), and a shift in microbiome composition and activity. It is hypothesized that SCFAs mediate parts of the beneficial effects of NDC. In mice, the influx of SCFA into the host correlated strongly with improvements of markers of the metabolic syndrome, in contrast to the concentrations of SCFA in the proximal colon. Therefore, the influx of short chain fatty acids (SCFA) into the body may be of high importance in improving metabolism. There is a need for more studies in humans to trace the life course of SCFA and their regulatory role in human metabolism. To study this inner world of bacterial products in humans, we will use a nasal-intestine catheter that can be used for delivery of components and sampling chyme in the proximal colon. Before the proposed methodology can be applied in a large intervention study, a small scale feasibility study needs to be performed that addresses colonic placement of the nasal-intestine cathether and colonic sampling of regular and NDC-enriched chyme samples. We will investigate the acute fermentation of fructo- and galacto-oligosaccharides in the proximal colon. Moreover, we will deliver 13C-labelled SCFA via a naso-intestinal catheter to quantify the fluxes of SCFA production, interconversion and uptake by the host. A small-scale, 7-day parallel feasibility trial, N=5 subjects will receive GOS/FOS supplements (mix 1:1 ratio, 15 gram/day), and N=5 other subjects will receive placebo supplements (isocaloric maltodextrin, 12 gram/day). At the last day of the supplementation period, the catheter will be placed, and afterwards participants stay maximum 5 hours in the hospital, to ensure progression of the nose-intestine catheter. After an overnight fast, subjects will visit the hospital again for measurements. Subjects will consume a NDC bolus (200 mL tap water, 5 gram fructo-oligosaccharides, 5 gram galacto-oligosaccharides, non-absorbable marker (PEG-4000). Afterwards, they are not allowed to eat for 6.5 hours. Isotopically 13C-labelled SCFAs will be delivered in the proximal colon. Blood and colonic luminal samples, breath samples, faeces and urine will be collected.

Conditions

Dietary Fiber

Outcome Measures

Primary Outcomes (6)

• Concentrations of carbohydrates

  mono-, di-, tri-, oligo- and polysaccharides in the intestinal lumen

  Between 0 and 400 minutes

• Relative microbiota composition and metabolites

  Microbiota and metabolites inside the intestine

  Between 0 and 400 minutes

• Concentrations of plasma metabolites

  organic acids, amino acids, glucose, cholesterol, fatty acids and bile acids in blood

  Between 0 and 400 minutes

• Catheter placement in the colon

  To show placement of a naso-intestinal catheter in the proximal colon.

  After 1 week

• Volume of colon sample (mL)

  To check whether enough material for analysis is obtained if the catheter system takes samples in the proximal colon of participants.

  Between 0 and 400 minutes

• Concentrations of SCFAs

  (13C isotopic) enrichments of SCFAs inside intestinal lumen

  Between 0 and 400 minutes

Secondary Outcomes (3)

• Concentrations of urine metabolites

  After 0 and 120 minutes

• Questionnaires about (dis)comfort of study procedures

  After 1 week

• Relative microbiota composition and metabolite concentrations

  After 1 week

Other Outcomes (1)

• Concentrations of non-digestible markers

  Between 0 and 400 minutes

Study Arms (2)

non-digestible carbohydrates

EXPERIMENTAL

fructo- and galacto-oligosaccharides

Dietary Supplement: fructo- and galacto-oligosaccharides

placebo

PLACEBO COMPARATOR

maltodextrin

Dietary Supplement: fructo- and galacto-oligosaccharides

Interventions

fructo- and galacto-oligosaccharides DIETARY_SUPPLEMENT

15 gram/day fructo- and galacto-oligosaccharides

Also known as: FOS and GOS

non-digestible carbohydrates; placebo

Eligibility Criteria

• Age: 18 Years - 60 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Males
• Age 18-60yrs
• BMI between 18.5 and 30 kg/m2
• Regular bowel movement (defaecation on average once a day)
• Signed informed consent

You may not qualify if:

• Having a history of medical or surgical events that, in the opinion of the Investigator, may either put the subject at risk because of participation in the study, or influence the results of the study (e.g. diabetes, cardiovascular disease, gastrointestinal disease, renal failure, cancer, infectious disease, nose/throat).
• Having a history of surgical events of the gastro-intestinal tract (e.g. bariatric surgery/gastric bypass surgery)
• Presence of swallowing disorder
• Use of any prescribed or non-prescribed medication (other than paracetamol) including antacids, analgesics, and herbal remedies during the three (3) weeks prior to study start.
• Being lactose intolerant
• Follows a vegan diet
• Use of antibiotics within 3 months of starting the study or planned during the study
• Use of pro- or prebiotics (e.g. galacto-oligosaccharides, fructo-oligosaccharides)
• Constipation/infrequent bowel movement (less than 3 times defaecation per week)
• Abuse of drugs/alcohol (alcohol: \>4 consumptions/day or \>21 consumptions/week)
• Smoker
• Having diarrhoea within 1 month prior to the study start
• Personnel of Wageningen University, Division of Human Nutrition, their partner and their first and second degree relatives
• Participation in another biomedical study or other research from the Division of Human Nutrition
• Not willing to be exposed to fluoroscopy

Sponsors & Collaborators

• Wageningen University: lead

Study Sites (1)

Wageningen University and Research

Wageningen, 6708 WE, Netherlands

RECRUITING

Central Study Contacts

MARA VAN TRIJP

CONTACT

0317 484 067; mara.vantrijp@wur.nl

Guido Hooiveld

CONTACT

guido.hooiveld@wur.nl

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, INVESTIGATOR
• Purpose: OTHER
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: February 26, 2020
• First Posted: August 5, 2020
• Study Start: October 8, 2020
• Primary Completion: February 1, 2021
• Study Completion: February 1, 2021
• Last Updated: October 19, 2020

Record last verified: 2020-10

Locations

NL (1)