Oligodendrocyte-substratum adhesion activates the synthesis of specific lipid species involved in cell signaling
Version of Record online: 11 OCT 2004
Copyright © 1992 Wiley-Liss, Inc.
Journal of Neuroscience Research
Volume 32, Issue 1, pages 69–78, May 1992
How to Cite
Vartanian, T., Szuchet, S. and Dawson, G. (1992), Oligodendrocyte-substratum adhesion activates the synthesis of specific lipid species involved in cell signaling. J. Neurosci. Res., 32: 69–78. doi: 10.1002/jnr.490320109
- Issue online: 11 OCT 2004
- Version of Record online: 11 OCT 2004
- Manuscript Accepted: 18 DEC 1991
- Manuscript Revised: 18 NOV 1991
- Manuscript Received: 12 SEP 1991
- second messengers;
- myelin-oligodendrocyte proteins
Ovine oligodendrocytes (OLGs) undergo biochemical and morphological changes following attachment to polylysine. Autoradiographs of two-dimensional thin-layer chromatograms of [14H]Gal-labeled OLG cultures revealed that attachment of OLGs to a polylysine substratum and their subsequent morphological differentiation is accompanied by an increased synthesis of multiple forms of galactosylceramide, sulfogalactosylceramide, and both sulfogalactosyl- and galactosyl-diglycerides, together with an array of complex sialoglycosphingolipids, predominantly GM2 ganglioside. As previously reported, overall lipid synthesis measured by [14C]acetate incorporation into glycerophosphatides, sphingomyelin, and neutral lipids also increased dramatically for up to 60 days (last time point examined) following OLG-substratum adhesion, reflecting membrane growth. Attachment was associated with a rapid augmentation in the synthesis of ethanolamine plasmalogen from 12 to 27% within 24 hr to reach a 35% plateau at 30 days and remain constant thereafter. In contrast, the plasmalogen content of phosphatidylcholine remained constant at 3–5%. This rapid increase in lipid synthesis (especially in the ethanolamine plasmalogen content following attachment) closely paralleled increased diacylglycerol (DAG) production and protein kinase C-dependent phosphorylation of both myelin basic protein and 2′,3′-cyclic nucleotide phosphohydrolase. Labeling studies indicated that the major source of [3H]arachidonate-labeled DAG following attachment was from phosphatidylinositol turnover (and to a lesser extent phosphatidylcholine) rather than polyphosphoinositides or plasmalogens. Enhanced lipid synthesis is not only required for the production of membranes in these myelin-producing cells but is also a source of second messengers required in the posttranslational modification of key myelin and cellular proteins. © 1992 Wiley-Liss, Inc.