Abstract
Previous randomized clinical trials suggest that supplementation of the human infant diet with up to 0.35% DHA may benefit visual development. The aim of the current study was to assess the impact of including arachidonic acid (AA) and a higher level of DHA in the postnatal monkey diet on visual development. Infant rhesus monkeys were fed either a control diet (2.0% α-linolenic acid as the sole n−3 FA) or a supplemented diet (1.0% DHA and 1.0% AA) from birth. Visual evoked potential acuity was measured at 3 mon of age. Rod and cone function were assessed in terms of parameters describing phototransduction. Electroretinogram (ERG) amplitudes and implicit times were recorded over a wide intensity range (−2.2 to 4.0 log scot td-sec) and assessed in terms of intensity response functions. Plasma DHA and AA were significantly increased (P <0.001) in the diet-supplemented monkeys compared with the control monkeys. There was an approximately equal effect of diet for the rod phototransduction parameters, sensitivity, and capacitance but in the opposite directions. Diet-supplemented monkeys had significantly shorter b-wave implicit times at low retinal illuminances (<−0.6 log scot td-sec). There were no significant effects of diet for visual acuity or the other 23 ERG parameters measured. The results suggest that supplementation of the infant monkey diet with 1.0% DHA and 1.0% AA neither harms nor provides substantial benefit to the development of visual acuity or retinal function in the first four postnatal months.
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Abbreviations
- AA, 20∶4n−6:
-
arachidonic acid
- ALA, 18∶3n−3:
-
α-linolenic acid
- ERG:
-
electroretinogram
- LCPUFA:
-
long-chain PUFA
- OP:
-
oscillatory potentials
- P2:
-
postreceptoral response
- P3:
-
phototransduction response
- PCA:
-
postconceptual age
- VEP:
-
visual evoked potential
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This study was conducted at the Laboratory of Membrane Biochemistry and Biophysics, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Rockville, MD 20852.
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Jeffrey, B.G., Mitchell, D.C., Hibbeln, J.R. et al. Visual acuity and retinal function in infant monkeys fed long-chain PUFA. Lipids 37, 839–848 (2002). https://doi.org/10.1007/s11745-002-0969-0
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DOI: https://doi.org/10.1007/s11745-002-0969-0