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Myelination of regenerating sciatic nerve of the rat: Lipid components and synthesis of myelin lipids

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Abstract

Changes of lipid, free fatty acid, protein, DNA, and RNA content in proximal and distal segments of regenerating sciatic nerve, from 14 to 120 days after crush, were determined. During the early stage of Wallerian degeneration, a marked decrease of phospholipid, cerebroside and sulfatide content and, in contrast, a marked increase of protein, DNA, RNA, and free fatty acid content, in the distal segment of crushed nerve compared to control, was observed. A gradual increase of phospholipid, cerebroside, and sulfatide levels, approaching normal values, and a gradual slope in the increase of protein, DNA, RNA, and free fatty acid levels over the ensuing time periods of regeneration was seen. Total cholesterol content was relatively constant during regeneration, slightly increasing at day 120. The activity of 2′,3′-cyclic nucleotide 3′-phosphodiesterase (CNPase) of myelin fraction purified from distal segment of regenerating sciatic nerve showed a significant increase in the 30–120 day regenerating period. A marked increase of the incorporation of [2-3H]glycerol and of [Me-14C]choline into myelin lipids of distal segment of regenerating nerve, was found. Labeling of myelin lipids with [3H]oleic acid (injected intravenously seven days before crush) support the evidence that a similar pattern of degeneration exists between two different types of trauma, i.e. nerve crush or cut. The findings suggest that, in the distal segment of crushed nerve, the lipid content as well as the myelin lipid synthesis increase as the regeneration period proceeds.

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Authors and Affiliations

  1. Division of Plastic Surgery, The Vitt. Emanuele Hospital, Catania, Italy

    F. Moschella

  2. Institute of Biochemistry, University of Catania, Viale Andrea Doria, 6, 95125, Catania, Italy

    M. Alberghina, M. Viola & A. M. Giuffrida

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  1. M. Alberghina
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  2. M. Viola
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  3. F. Moschella
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  4. A. M. Giuffrida
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Alberghina, M., Viola, M., Moschella, F. et al. Myelination of regenerating sciatic nerve of the rat: Lipid components and synthesis of myelin lipids. Neurochem Res 8, 133–150 (1983). https://doi.org/10.1007/BF00963914

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