Docosahexaenoic and arachidonic acid influence on preterm baboon retinal composition and function

Area of Science:

• Ophthalmology and Visual Science
• Nutritional Neuroscience
• Neonatal Research

Background:

• Dietary n-3 polyunsaturated fatty acid deficiency and prematurity are linked to poor visual function in human and nonhuman primates.
• Understanding the impact of diet on visual development in preterm infants is crucial for optimizing long-term outcomes.

Purpose of the Study:

• To measure retinal long-chain polyunsaturate (LCP) concentrations and electroretinogram (ERG) parameters in term and preterm baboons.
• To evaluate the effects of different dietary interventions, including breast milk and supplemented/unsupplemented formula, on visual function.

Main Methods:

• Baboon neonates were divided into four groups: term/breast-fed, term/formula-fed, preterm/unsupplemented formula, and preterm/supplemented formula.
• Electroretinograms (ERGs) and retinal fatty acid compositions were analyzed.
• Key ERG parameters (a-wave slope, amplitude, implicit time; b-wave amplitude, implicit time) were correlated with LCP concentrations.

Main Results:

• Preterm infants receiving formula supplemented with long-chain polyunsaturates (P+) showed significant improvements in ERG parameters (a-wave slope, b-wave amplitude) over four weeks.
• Term breast-fed infants (B) exhibited superior retinal response amplitudes (a-wave and b-wave) compared to all formula-fed groups at four weeks.
• Retinal concentrations of 22:6n-3 (docosahexaenoic acid) and related n-3 fatty acids positively correlated with improved ERG parameters.

Conclusions:

• Breast-feeding is optimal for retinal function development in 4-week-old baboons.
• Formula supplemented with 22:6n-3 (DHA) effectively preserves retinal DHA levels and enhances ERG parameters in preterm infants.
• Retinal DHA status is strongly associated with a-wave parameters, highlighting its critical role in visual pathway development.