- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00718653
Effects of Antioxidants on Human Macular Pigments
Age-related macular degeneration (AMD) is the leading cause of blindness in the United States. Low dietary intake or low blood levels of lutein and zeaxanthin, which are the only pigments found in the macular region of the human retina, has been associated with an increased risk for AMD. We have reported that the dietary supplementation of lutein and zeaxanthin can increase the macular pigments (MP) of the eye. MP effectively absorbs blue light as well as quenches reactive oxygen species (ROS). Green tea polyphenols are also effective scavenger of ROS in vitro.
Our goal is to elucidate how to effectively increase MP by physiologic levels of antioxidant supplementation. We hypothesize that lutein and tea polyphenols protect the macula of the eye by increasing MP carotenoids effectively through an antioxidant mechanism.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Massachusetts
-
Boston, Massachusetts, United States, 02111
- Jean Mayer USDA-Human Nutrition Research Center on Aging at Tufts University
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Normal hematologic parameters, normal serum albumin, normal liver function, normal kidney function, absence of fat malabsorption and no drug intake which would interfere with fat absorption, metabolism or blood clotting
- non-smokers
Exclusion Criteria:
- A history of kidney stones, active small bowel disease or resection, atrophic gastritis, hyperlipidemia, insulin-requiring diabetes, alcoholism, pancreatic disease, or bleeding disorders
- Exogenous hormone users
- weighing greater than 20% above or below the NHANES median standard
- subjects with serum lutein/zeaxanthin concentrations that are more than 150 % of median of normal population (as previously reported in NHANES III at same age group)
- early age related macular degeneration, cataract, or glaucoma except for those with age appropriate progression of the eye status.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Double
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: 1
lutein
|
Lutein (12 mg/d)
|
Experimental: 2
Lutein plus green tea extract
|
lutein (12 mg/d) plus green tea extract (200 mg/d)
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
macular pigments, Plasma lutein concentrations
Time Frame: Every month - baseline, 1, 2, 3, & 4 months
|
Every month - baseline, 1, 2, 3, & 4 months
|
Collaborators and Investigators
Sponsor
Publications and helpful links
Helpful Links
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- R03EY015674 (U.S. NIH Grant/Contract)
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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