The Macula Pigment Miracle
Friday, August 27, 2010
A new study out of the Department of Ophthalmology and Visual Sciences, Moran Eye Center, University of Utah, which was published in the August 2010 Archives of Biochemistry and Biophysics suggests that macular pigment direct quenching of singlet oxygen and scavenging free radicals is a major mechanism that helps prevent light-induced oxidative stress. The authors conclude that zeaxanthin, lutein and mezo-zeaxanthin act as intrinsic filters of short wavelength light to prevent or reduce the generation of singlet oxygen in the human retinal pigment epithelium (RPE) and choroid. They also suggested that a mixture of these carotenoids quench more singlet oxygen than any one of these individual carotenoids at the same total concentration.
Again, the whole is more than the sum of its parts - particularly where micronutrients are concerned.
An equally important study published last year in the Journal of Lipid Research found that the xanthophyll carotenoids, zeaxanthin and lutein are preferentially taken up by the retinal cells compared to beta carotene.
Because past studies have shown that a protein called SR-B1 is involved in intestinal absorption of lutein and zeaxanthin, the authors investigated whether the same protein is also involved in transporting these nutrients to the eye. The SR-B1 protein is scavenger receptor class B, type 1.
And don't forget to visit the Ocular Nutrition Society (ONS) web site www.ocularnutritionsociety.org to register for the November 16, 2010 pre-Academy of Optometry all day course in San Francisco called "From Testing to Tasting: An Integrative Approach to Eye Health." This course promises to be entertaining education.
Barraquer Pediatric Speculum 9-570-2
Clinical references available in the Biosyntrx office.