- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03153046
The Effects of Prebiotics on Cognitive Functioning and Weight Gain in Psychosis (Prepsy)
Effects of Modulating the Immune System With Prebiotics on Cognition and Weight in Patients With Psychosis
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
An 24-week maltodextrin-control cross-over experimental medicine study enrolling 40 patients with psychosis. Participants will receive a 12-week treatment with Bimuno™ GOS, as well as a 12-week maltodextrin supplement. The order of supplements that participants will receive is randomized. A washout period was considered unnecessary as maltodextrin is an inactive placebo wherein negligible effects have been shown on bifidobacteria growth, and therefore, would present with no carryover/lasting effects to mask the prebiotic effect.
Eligible patients will be invited to be screened for the study and assessed to ensure they meet inclusion/exclusion criteria. If the participant passes this initial screening stage and conditional to informed consent, he/she will then be randomized into one of the two groups. Once decided, the participant will be assessed by a research assistant using standard clinical assessments used to diagnose/evaluate cognitive deficits. A 12-week supply of sachets containing prebiotic or maltodextrin will be provided for the participant to allow participants to complete the first quarter of the study. Additional 12-week supplies of prebiotics or maltodextrin will be provided at the study follow-up. Since clozapine/olanzapine are well known antipsychotics that induce weight gain and interfere with the immune system an additional sub-analysis of those participants stable on clozapine/olanzapine will be performed, contingent on the demographics.
The study will include five sessions in total all taking place at either University Department of Psychiatry, Warneford Hospital, or a location convenient to the participant (e.g., patient home): (1) screening session, (2) baseline cognitive and blood measurements, (3) study follow up, and (4) final testing session.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
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Oxfordshire
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Oxford, Oxfordshire, United Kingdom, OX3 7JX
- Warneford Hospital
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Male or Female, aged 18-60 years of age.
- Participant is willing and able to give informed consent for participation in the study
- Diagnosed with psychotic disorder ICD-10 (e.g., schizophrenia, schizoaffective disorder, psychosis NOS)
- Stable on psychotropic medication for >1 month with cognitive deficits (Cognitive deficits will be evaluated using the BACS test cut off score of 1.0 standard deviation below the healthy mean; those that score within the normal range i.e., within 1.0 standard deviations of the mean are not considered cognitively impaired and thus will not be included in the study)
Exclusion Criteria:
- Not considered suitable for the study by the clinical team, for whatever reason
- Current inpatient in psychiatric hospital
- Additional major medical disorders (including diseases affecting the human gastrointestinal tract and blood-borne disorders)
- Antibiotic, probiotic and/or prebiotic treatment in at least the 3 previous months
- Participants who are taking any other food supplements which, in the opinion of the Investigators, may affect the results
- Participants who have a known intolerance to lactose (self-identified)
- Any significant recent change in diet which, to the discretion of the Investigators, may affect the results
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Other
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Double
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Prebiotics
12 week ingestion of prebiotics, Bimuno galacto-oligosaccharide (B-GOS).
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Bimuno (BGOS): The active supplement of the food supplement (Bimuno) used in this study is called galacto-oliogosaccharides (Bimuno®, BGOS).
BGOS is a compound metabolised by specific bifidobacteria, which are beneficial bacteria, in our colon.
Bimuno (2.3 calories) is composed by the following ingredients per gram of Bimuno: 0.96g dry matter; <01g Fat; <0.06g Protein; 0.821g GOS; 0.119g Lactose; 0.0331g Glucose and 0.0029g Galactose.
Bimuno is tasteless.
Bimuno will be supplied in coded sachets (3.5g) for dispensing by parents.
Each participant will be required to consume 1 sachet daily during breakfast, by mixing it with food or in a drink.
Other Names:
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Placebo Comparator: Maltodextrin
12 week ingestion of maltodextrin
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Maltodextrin is a polysaccharide in powder form, which grows most bacteria in the gut, and not specifically the beneficial bifidobacteria.
The placebo will also be provided in daily coded sachets (3.5g) for dispensing by parents.
Each participant will be required to consume 1 sachet daily during breakfast, by mixing it with food or in a drink.
This placebo has been used in previous studies, in which Bimuno was used as the active intervention.
The placebo will be similar in taste and colour to the active intervention.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Cognitive Assessments using the BAC's Test
Time Frame: 1 year
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The Brief Assessment of Cognition (BAC), developed by NeuroCog.
Trials, assesses five different domains of cognitive function with six tests (i.e., Verbal Memory & Learning (Verbal Memory), Working Memory (Digit Sequencing), Motor Function (Token Motor Task), Verbal Fluency (Semantic and Letter Fluency), Speed of Processing (Symbol Coding), and Executive Function (Tower of London)).
Outcome measures from each test will be combined into one composite Z-Score, and transformed into a T-Score to evaluate global cognition on a standardise curve.
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1 year
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Body Mass Index (BMI)
Time Frame: 1 year
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Weight in kilograms and height in meters will be measured to calculate the BMI kg/m^2 of a participant.
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1 year
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Waist-Hip Ratio
Time Frame: 1 year
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Waist and hip circumference will be measured in centimeters where the Waist-to-Hip ratio will calculated.
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1 year
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Circulating Inflammatory Markers
Time Frame: 1 year
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Collected venous blood will be spun down to isolate plasma wherein biochemical tests examining inflammatory markers including interleukin-1b, tumour necrosis factor alpha, interleukin-8 and acetate will be evaluated.
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1 year
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Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Belinda Lennox, MD, University of Oxford
Publications and helpful links
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 12302
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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