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Optimization of Selenoprotein P in Chinese Subjects

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ClinicalTrials.gov Identifier: NCT00428649
Recruitment Status : Completed
First Posted : January 30, 2007
Last Update Posted : March 7, 2012
Sponsor:
Collaborator:
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Information provided by (Responsible Party):
RBurk, Vanderbilt University

Brief Summary:
The purpose of this study is to determine the amount of selenium as selenomethionine that is required to optimize selenoprotein P in selenium-deficient Chinese subjects

Condition or disease Intervention/treatment Phase
Selenium Deficiency Dietary Supplement: 20 µg selenium Dietary Supplement: 40 µg selenium Dietary Supplement: 60 µg selenium Dietary Supplement: 80 µg selenium Dietary Supplement: 100 µg selenium Dietary Supplement: 120 µg selenium Dietary Supplement: placebo Not Applicable

Detailed Description:

Selenium is an essential nutrient. The Recommended Dietary Allowance (RDA) for selenium is considered to be the amount required to optimize plasma selenoproteins. There are two selenoproteins present in the plasma: selenoprotein P (Se-P) and glutathione peroxidase 3 (GPX-3). Although the amount of selenium required to optimize GPX-3 has been determined, the amount required to optimize Se-P in the plasma remains unknown. We aim to determine this amount by supplementing selenium deficient subjects with varying amounts of selenium as selenomethionine.

The study will take place in Mianning County, China, where selenium status is low. Approximately 150 people will be screened for eligibility to participate in this study. 98 subjects will be enrolled. Background information obtained from each participant will be: age, height, weight and smoking status.

Subjects will be randomized to a selenium supplement group. The selenium supplement will contain either 0, 20, 40, 60, 80, 100, or 120 µg of selenium as selenomethionine. A CDC worker will visit each participant daily to give them their selenium supplement. The CDC worker will watch them take their supplement and will ask if they have any unanticipated problems. Blood samples of 20 ml will be obtained at weeks 0, 4, 8, 12, 16, 20, 24, 32, and 40. Hair samples and 24-hr urine collections will be obtained at 0, 20 and 40 weeks. The total study duration is 40 weeks.


Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 98 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Optimization of Selenoprotein P in Chinese Subjects
Study Start Date : March 2007
Actual Primary Completion Date : December 2007
Actual Study Completion Date : October 2008

Arm Intervention/treatment
Experimental: 1
20 µg selenium as selenomethionine
Dietary Supplement: 20 µg selenium
20 µg selenium as selenomethionine

Experimental: 2
40 µg selenium as selenomethionine
Dietary Supplement: 40 µg selenium
40 µg selenium as selenomethionine

Experimental: 3
60 µg selenium as selenomethionine
Dietary Supplement: 60 µg selenium
60 µg selenium as selenomethionine

Experimental: 4
80 µg selenium as selenomethionine
Dietary Supplement: 80 µg selenium
80 µg selenium as selenomethionine

Experimental: 5
100 µg selenium as selenomethionine
Dietary Supplement: 100 µg selenium
100 µg selenium as selenomethionine

Experimental: 6
120 µg selenium as selenomethionine
Dietary Supplement: 120 µg selenium
120 µg selenium as selenomethionine

Placebo Comparator: 7
placebo
Dietary Supplement: placebo
placebo




Primary Outcome Measures :
  1. Plasma selenoprotein P levels at 0, 4, 8, 12, 16, 20, 24, 32, and 40 weeks [ Time Frame: 40 weeks ]

Secondary Outcome Measures :
  1. Total plasma selenium concentrations at 0, 4, 8, 12, 16, 20, 24, 32, and 40 weeks [ Time Frame: 40 weeks ]
  2. Plasma glutathione peroxidase activity at 0, 4, 8, 12, 16, 20, 24, 32, and 40 weeks [ Time Frame: 40 weeks ]
  3. 24hr urinary selenium excretion at 0, 20 and 40 weeks [ Time Frame: 40 weeks ]
  4. Hair selenium levels at 0, 20 and 40 weeks [ Time Frame: 40 weeks ]


Information from the National Library of Medicine

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Ages Eligible for Study:   17 Years and older   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • aged 17 years or older
  • healthy
  • resident of Mianning County for at least 1 year
  • hematocrit (PCV) of 30 or greater

Exclusion Criteria:

  • subject has taken selenium supplements within the year prior to study
  • subject plans to relocate during study

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00428649


Locations
China, Sichuan
Sichuan Center for Disease Control and Prevention (Sichuan CDC)
Chengdu, Sichuan, China
Sponsors and Collaborators
Vanderbilt University
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Investigators
Principal Investigator: Raymond F Burk, M.D. Vanderbilt University
Study Director: Yiming Xia, Ph.D. Sichuan CDC, Chengdu

Publications:
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: RBurk, M.D., Vanderbilt University
ClinicalTrials.gov Identifier: NCT00428649     History of Changes
Other Study ID Numbers: DK58763-opt
R01DK058763 ( U.S. NIH Grant/Contract )
First Posted: January 30, 2007    Key Record Dates
Last Update Posted: March 7, 2012
Last Verified: March 2012

Keywords provided by RBurk, Vanderbilt University:
Selenium supplements
Selenoprotein P
Optimization

Additional relevant MeSH terms:
Selenium
Antioxidants
Molecular Mechanisms of Pharmacological Action
Protective Agents
Physiological Effects of Drugs
Trace Elements
Micronutrients
Growth Substances