Serum, retinal, choroidal vitreal vitamin E concentrations in human infants

Area of Science:

• Ophthalmology
• Neonatology
• Nutritional Science

Background:

• Vitamin E (alpha-tocopherol) is used as an antioxidant to reduce retinopathy of prematurity in preterm neonates.
• Efficacy of vitamin E is potentially linked to its concentration within ocular tissues, particularly the retina.
• Limited data exists on alpha-tocopherol distribution in human eye tissues.

Purpose of the Study:

• To quantify total alpha-tocopherol levels in the retina, choroid, and vitreous of human eyes.
• To compare ocular alpha-tocopherol concentrations with serum levels at the time of death.
• To investigate the relationship between vitamin E supplementation and ocular/serum alpha-tocopherol levels in neonates.

Main Methods:

• Analysis of alpha-tocopherol levels in retinal, choroidal, and vitreal tissues from thirteen whole eye donations.
• Comparison of ocular alpha-tocopherol concentrations with concurrently measured serum alpha-tocopherol levels.
• Categorization of infants into supplemented and unsupplemented groups (Group A).

Main Results:

• Retinal alpha-tocopherol levels were significantly higher than those in the choroid and vitreous.
• Higher serum alpha-tocopherol levels were positively associated with higher retinal alpha-tocopherol concentrations.
• Both serum and retinal alpha-tocopherol levels were lower in unsupplemented preterm infants.

Conclusions:

• The retina accumulates higher concentrations of alpha-tocopherol compared to other ocular tissues.
• Serum alpha-tocopherol levels serve as an indicator for retinal alpha-tocopherol concentration.
• Vitamin E supplementation appears to increase both serum and retinal alpha-tocopherol levels in preterm neonates, suggesting a need for further pharmacokinetic studies.