Influenza Clinical Trial
— TaxErOfficial title:
A Pilot Study of Dietary Taxifolin/Dihydroquercetin and Ergothioneine and Immune Biomarkers in Healthy Volunteers
Verified date | May 2024 |
Source | University of Southampton |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Interventional |
The complexities of the immune system make measuring the impact of dietary interventions upon its function challenging. The immune system is highly responsive to environmental influences, including the diet. An individual's diet provides the energy required to mount a strong and protective immune response, the building blocks required for synthesis of immune mediators such as antibodies and cytokines, and can also indirectly affect immune function via changes in the gut microbiome. Immune function varies across the lifecourse, with a well understood decline in immune function with age, resulting in impaired vaccination responses and an increased risk of infections and of severe complications and mortality arising from common communicable diseases such as influenza. This impaired immunity with ageing is known as immunosenescence and this affects both innate and acquired arms of the immune system.
Status | Active, not recruiting |
Enrollment | 90 |
Est. completion date | August 2024 |
Est. primary completion date | September 29, 2022 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 50 Years to 65 Years |
Eligibility | Inclusion Criteria: - age 50-65yr - BMI 18.5-30kg/m2 - Willing to avoid consumption of foods rich in Taxifolin/DHQ and Ergothioneine during the study period - Willing to avoid taking any other food supplements or high doses of vitamins during the study period - Able to provide written informed consent. Exclusion Criteria: - Use of prescription medication which may influence immune function, such as anti-inflammatory or immunosuppressant medication - Diabetes requiring any medication - Liver cirrhosis - A history of drug or alcohol misuse - Asplenia or other acquired or congenital immunodeficiencies - Any autoimmune disease including connective tissue diseases - Malignancy - Laboratory confirmed SARS-CoV-2 infection within last 3 months - self-reported symptoms of acute or recent infection (including use of antibiotics within the last 3 months) |
Country | Name | City | State |
---|---|---|---|
United Kingdom | NIHR Southampton Biomedical Research Centre | Southampton | Hampshire |
Lead Sponsor | Collaborator |
---|---|
University of Southampton | Blue California |
United Kingdom,
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Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Phagocytosis activity by granulocytes ex vivo | Mean fluorescence intensity per cell will be assessed by flow cytometry. | 8 weeks post intervention | |
Secondary | Percentage phagocytosis by monocytes ex vivo | Percentage of cells undergoing phagocytosis will be assessed by flow cytometry. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Phagocytosis activity by monocytes ex vivo | Mean fluorescence intensity per cell will be assessed by flow cytometry. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Percentage phagocytosis by granulocytes ex vivo | Percentage of cells undergoing phagocytosis will be assessed by flow cytometry. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Phagocytosis activity by granulocytes ex vivo | Mean fluorescence intensity per cell will be assessed by flow cytometry. | 4 weeks, 3 months post intervention | |
Secondary | Percentage oxidative burst by monocytes ex vivo | Percentage of cells undergoing oxidative burst will be assessed by flow cytometry. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Oxidative burst activity by monocytes ex vivo | Mean fluorescence intensity per cell will be assessed by flow cytometry. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Percentage oxidative burst by granulocytes ex vivo | Percentage of cells undergoing oxidative burst will be assessed by flow cytometry. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Oxidative burst activity by granulocytes ex vivo | Mean fluorescence intensity per cell will be assessed by flow cytometry. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Frequencies of naive T cells | The proportion of naive T cells will be assessed by flow cytometry. | 8 weeks | |
Secondary | Frequencies of memory T cells | The proportion of memory T cells will be assessed by flow cytometry. | 8 weeks | |
Secondary | CD57 expression upon T cells. | The proportion of T cells expressing CD57 (a marker associated with chronic immune activation) and the mean fluorescence intensity per cell will be assessed by flow cytometry. | 8 weeks | |
Secondary | CD28 expression upon T cells. | The proportion of T cells expressing CD28 (a cell surface marker required for T cell activation and survival) and the mean fluorescence intensity per cell will be assessed by flow cytometry. | 8 weeks | |
Secondary | Plasma lipid peroxides | Participant plasma lipid peroxides will be measured by colorimetric analysis. | 8 weeks | |
Secondary | Urinary isoprostanes | Participant urinary isoprostanes will be measured by commercially available ELISA. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Plasma isoprostanes | Participant plasma isoprostanes will be measured by commercially available ELISA. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Cytokine production by cryopreserved peripheral blood mononuclear cells in response to lipopolyssaccharide | A panel of pro- and anti-inflammatory cytokines secreted by immune cells ex vivo will be assessed by Luminex array. | 4 weeks, 8 weeks | |
Secondary | Cytokine production by cryopreserved peripheral blood mononuclear cells in response to influenza or coronavirus vaccine products | A panel of pro- and anti-inflammatory cytokines secreted by immune cells ex vivo will be assessed by Luminex array. | 4 weeks, 8 weeks | |
Secondary | Metabolomic analysis of urine samples | Full metabolic profiling of first-morning urine samples will be used to assess changes to metabolic activity of participants and their microbiome. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Metabolomic analysis of serum samples | Full metabolic profiling of serum samples will be used to assess changes to metabolic activity of participants. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Faecal microbiome analysis | Sequences of ribosomal RNA (rRNA) in participant faecal samples will be measured to assess changes in the numbers or proportions of bacterial genera and species/strains. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Incidence of self-reported seasonal cold, coronavirus and influenza-like illness. | A daily online form will be completed by participants to log any seasonal cold, coronavirus and influenza-like illness. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Duration of self-reported illness. | A daily online form will be completed by participants to log any self-reported illness. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Severity of self-reported illness. | A daily online form will be completed by participants to log any self-reported illness. | 4 weeks, 8 weeks, 3 months post intervention | |
Secondary | Self-reported medication use. | A daily online form will be completed by participants to log any medication use. | 4 weeks, 8 weeks, 3 months post intervention |
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