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Enzymic synthesis of ethanolamine plasmalogens through ethanolaminephosphotransferase activity in neurons and glial cells of rabbit in vitro

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Lipids

Abstract

The de novo synthesis of ethanolamine plasmalogen in isolated neuronal and glial cells from adult rabbit brain cortex was investigated in vitro, using labeled cytidine-5′-diphosphate ethanolamine as lipid precursor. The neuronal cell enriched fraction was found to possess a twofold ethanolaminephosphotransferase activity (EC 2.7.8.1), as compared to the glial fraction. The neuronal/glial ratio was similar both in the absence and in the presence of saturating alkenylacyl glycerol. Under the most favorable conditions, rates of 31 nmoles and 16 nmoles ethanolamine plasmalogen/mg protein/30 min were obtained for neurons and glia, respectively. Several kinetic properties of the phosphotransferase were found to be similar both in neurons and glia, e.g., Km of cytidine-5′-diphosphate ethanolamine, pH optimum, need for divalent cations; the Km value for alkenylacyl glycerol was twofold higher in glia (4 mM) than in neurons (2 mM). The neuronal/glial ratio for the phosphatidylethanolamine synthesizing activity was 2, 4.5, and 6 on using diacyl glycerols prepared from ox heart, ox brain, and soybean, respectively. It is concluded that the cytidine-dependent system for ethanolamine plasmalogen and phosphatidylethanolamine synthesis is concentrated prevalently in the neuronal cells, as compared to glia.

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Authors and Affiliations

  1. Department of Biochemistry, The Medical School, University of Perugia, 06100, Perugia, Italy

    L. Binaglia, R. Roberti, G. Goracci, E. Francescangeli & G. Porcellati

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  1. L. Binaglia
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  2. R. Roberti
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  3. G. Goracci
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  4. E. Francescangeli
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  5. G. Porcellati
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Binaglia, L., Roberti, R., Goracci, G. et al. Enzymic synthesis of ethanolamine plasmalogens through ethanolaminephosphotransferase activity in neurons and glial cells of rabbit in vitro. Lipids 9, 738–747 (1974). https://doi.org/10.1007/BF02532139

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  • DOI: https://doi.org/10.1007/BF02532139

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