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Neurochemical Research

, Volume 19, Issue 8, pp 967–974 | Cite as

Metabolic turnover of myelin glycerophospholipids

  • Pierre Morell
  • Andrea H. Ousley
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Abstract

The apparent half life for metabolic turnover of glycerophospholipids in the myelin sheath, as determined by measuring the rate of loss of label in a myelin glycerophospholipid following radioactive precursor injection, varies with the radioactive precursor used, age of animal, and time after injection during which metabolic turnover is studied. Experimental strategies for resolving apparent inconsistencies consequent to these variables are discussed. Illustrative data concerning turnover of phosphatidylcholine (PC) in myelin of rat brain are presented. PC of the myelin membrane exhibits heterogeneity with respect to metabolic turnover rates. There are at least two metabolic pools of PC in myelin, one with a half life of the order of days, and another with a half life of the order of weeks. To a significant extent biphasic turnover is due to differential turnover of individual molecular species (which differ in acyl chain composition). The two predominant molecular species of myelin PC turnover at very different rates (16:0, 18:1 PC turning over several times more rapidly than 18:0, 18:1 PC). Therefore, within the same membrane, individual molecular species of a phospholipid class are metabolized at different rates. Possible mechanisms for differential turnover of molecular species are discussed, as are other factors that may contribute to a multiphasic turnover of glycerophospholipids.

Key Words

Myelin metabolism phospholipid metabolism phosphatidylcholine phosphatidylethanolamine 

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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • Pierre Morell
    • 1
  • Andrea H. Ousley
    • 2
  1. 1.Dept. of Biochemistry and Biophysics and Brain and Development Research CenterUniversity of North CarolinaChapel Hill
  2. 2.Dept. of PhysiologyUniversity of North CarolinaChapel Hill

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