Selenium and Immune Function

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00279812
Recruitment Status : Completed
First Posted : January 20, 2006
Last Update Posted : March 21, 2011
Food Standards Agency, United Kingdom
Information provided by:
Quadram Institute

January 19, 2006
January 20, 2006
March 21, 2011
April 2005
Not Provided
Cellular and humoral immune response
Same as current
Complete list of historical versions of study NCT00279812 on Archive Site
  • Selenium status
  • Selenoproteins and Se-biomarkers
Same as current
Not Provided
Not Provided
Selenium and Immune Function
Selenium and Immune Function
The aim of the study is to investigate the relationship between dose and form of selenium on immune function, and to identify functional markers of selenium status.

One of the proposed consequences of marginal selenium status is impaired immune function. Establishing the potential role of selenium as an enhancer of immune response in vivo may provide evidence-base for public health policy, with important consequences for preventing influenza and similar diseases in the elderly.

The project consists of a placebo controlled selenium supplementation study and a dietary intervention with un-enriched and selenium enriched onions. In a parallel group design, subjects will be given either one of three doses of Selenomethionine (50, 100 or 200µg selenium/day) or a placebo per day or selenium enriched or un-enriched onions (in the form of test meals) for 12 weeks. Changes in the expression of Se-responsive genes and proteins in blood will be measured and compared with changes in plasma Se concentration and selected selenoproteins. The relationship between dietary Se intake and systemic and mucosal immune responses to influenza vaccine will be examined. Changes in immune cell populations and the influence of Se on NK and CD8 cytotoxicity will be determined by flow cytometry.

Not Applicable
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double
Behavioral: Selenomethionine (supplement) and selenium enriched onions
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Same as current
August 2008
Not Provided

Inclusion Criteria:

  • Men and women, age 50-64
  • Plasma selenium level <1.2µmol/l (±10%)

Exclusion Criteria:

  • Elevated blood pressure measurements (<90/50 or <95/50 if symptomatic or >160/100)
  • Body mass index (BMI) <18.5 or >35
  • Results of the clinical screening which are judged by the Human Nutrition Unit (HNU) Medical advisor to be indicative of a health problem and could compromise the well-being of the volunteer if they participated, or which would affect the data.
  • Smokers
  • Diagnosed with gastrointestinal disease (excluding hiatus hernia unless symptomatic or study intervention/procedure is contraindicated) for which they have been taking prescription drugs on a chronic basis.
  • Diagnosed with a long-term illness requiring active treatment, e.g. diabetes, cancer, cardiovascular disease.
  • On regularly prescribed medication known to have a profound effect on the immune function
  • Regularly using antacids and laxatives (at least once a week)
  • Sufferers of hay-fever taking regular steroid medication
  • Unwillingness to discontinue dietary (other than vitamins and minerals) or herbal supplements less than one month prior to the start of the study and for the duration of the study
  • Blood donation within 16 weeks of the first study sample and who intend to donate blood less than 16 weeks after the last study sample
  • Antibiotic use within four weeks prior to starting the study
  • Those who receive or plan to receive any other type of immunisation during the study period
  • Those who have received an immunisation within 6 months of the start of the study
  • Intention to go on holiday/trips for more than 2 weeks during the twelve week intervention
  • Those planning a holiday/trip that requires immunisation during the twelve week intervention period
  • Parallel participation in another research project which involves dietary intervention or sampling of biological fluids/materials
  • Allergic to eggs or egg products
  • Allergic to chicken protein
  • Allergic to the antibiotic Gentamicin
  • A history of Guillain-Barre syndrome
Sexes Eligible for Study: All
50 Years to 64 Years   (Adult)
Contact information is only displayed when the study is recruiting subjects
United Kingdom
FSA 51949F
Not Provided
Not Provided
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Not Provided
Quadram Institute
Food Standards Agency, United Kingdom
Principal Investigator: Susan J Fairweather-Tait, BSc., MSc., PhD., DSc University of East Anglia
Quadram Institute
March 2011

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP