Lipids

, Volume 22, Issue 4, pp 253–260 | Cite as

Effects of aging on the composition and metabolism of docosahexaenoate-containing lipids of retina

  • N. P. Rotstein
  • M. G. Ilincheta de Boschero
  • N. M. Giusto
  • M. I. Aveldaño
Article

Abstract

The amount of docosahexaenoate (22∶6n−3)-containing phospholipid species decreases with aging in the rat retina. Most lipids, but especially choline and serine glycerophospholipids, show a significant fall in 22∶6n−3, which is not compensated by increases in other polyenoic fatty acids. The decrease not only affects 22∶6 but also various very long chain n−3 hexaenoic fatty acids which, in phosphatidylcholine, have up to 36 carbon atoms, and which are probably synthesized by successive elongations of 22∶6n−3. The in vitro incorporation of [2-3H] glycerol into retinal lipids indicates that the de novo biosynthetic pathways are not impaired by aging. The incorporation of [1-14C]docosahexaenoate is significantly stimulated into all lipids of aged retinas, but to the largest extent in those showing the largest decreases in 22∶6, especially in choline glycerophospholipids. The results indicate that the decreased levels of 22∶6 with aging are due not to an impaired activity of the enzymes involved in the synthesis and turnover of phospholipids but to a decreased availability of this polyene in the retina. It is suggested that this may stem from a defect in some of the enzymatic steps that lead to the synthesis of 22∶6n−3, probably that catalyzed by Δ4 desaturase, the effect on longer hexaenes being secondary to the decreased synthesis of 22∶6.

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Copyright information

© American Oil Chemists’ Society 1987

Authors and Affiliations

  • N. P. Rotstein
    • 1
  • M. G. Ilincheta de Boschero
    • 1
  • N. M. Giusto
    • 1
  • M. I. Aveldaño
    • 1
  1. 1.Instituto de Investigaciones BioquímicasUniversidad Nacional del Sur and Consejo Nacional de Investigaciones Científicas y TécnicasArgentina

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