Healthy Humans
Conditions
Keywords
gamma delta T cell, proliferation, cytokine secretion, immune function, antioxidant status
Brief summary
The purpose of this study is to determine whether consuming a beverage made with cranberry polyphenols and proanthocyanidins is effective in modifying immune function by enhancing immune cell proliferation, cytokine production, and antioxidant capacity. If immune cell proliferation is improved, the subjects are expected to have fewer cold and flu symptoms.
Detailed description
The study will be conducted as a randomized, double blind, placebo-controlled parallel trial. Subjects will be randomly assigned to either the Treatment (cranberry beverage) group or the Placebo group and each will be instructed to consume the test beverages twice a day for 70 days. The beverage is not commercially prepared juice, but is a beverage prepared with an extract of cranberry that contains polyphenols and proanthocyanidins. Blood is taken at baseline, and day 70. Subjects are given a diary to keep a record of their cold and flu symptoms. Serum is used to determine the antioxidant activity by the ORAC method. Peripheral blood mononuclear cells are isolated from the blood draw and used fresh, cultured for 24 hours or cultured for 10 days. Freshly isolated cells will be used to determine αβ-T, γδ-T, B and NK cell numbers and then cultured in autologous serum for 10 days to determine how well they proliferate. The supernatant of 24 hour cultures will be used for cytokine determination. If cells have been primed by the beverage made with cranberry compounds, the investigators expect the cells to proliferate to a greater extent and have modified cytokine production compared to placebo. If the beverage made with cranberry compounds enhances the proliferation of one or more of these cell types (αβ-T, γδ T, B or NK cell), then it is possible that there will be fewer cold and flu symptoms in the group consuming the cranberry beverage. Incidence of illness is not expected to change, only the severity of the illness.
Interventions
DIETARY_SUPPLEMENTBeverage made to look like the cranberry beverage
one 15 ounce bottle of beverage consumed daily
DIETARY_SUPPLEMENTBeverage made from cranberry compounds
one 15 ounce bottle consumed daily for 70 days
Sponsors
Ocean Spray, Inc.
University of Florida
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 50 Years
Healthy volunteers
Yes
Inclusion criteria
* Health male or non-pregnant female * Between the ages of 21 and 50 * BMI between 18 and 35
Exclusion criteria
* High blood pressure define as 140/90 * Ongoing or chronic illness or infection * On hypertensive medication, immunosuppressive drugs, antibiotics, or chronic use of NSAIDS * Taking plant-based dietary supplements, antioxidant supplements, or probiotics * Vegetarian or strict vegan * Consume more than 1 cup of tea (iced or hot) per day * Consumes more than 2 glasses of alcoholic beverages per day * Consume more than 7 fruits and vegetables per day
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Physiological modifications to immune cell function | 70 days | Proliferation of γδ-T cells when cultured ex vivo in autologous serum |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Cold and flu symptoms | 70 days | Incidence and severity of cold and flu symptoms, total and individual. Other signs of severity, for example, visits to doctor or health clinic, reduction in daily activities, medications prescribed or purchased OTC. |
| Anti-inflammatory outcome | 70 days | Serum antioxidant status, cytokine production and proliferation of αβ-T, B and NK cells |
Countries
United States
Outcome results
None listed