Expression of Glycolipids and Myelin Associated Glycoprotein during the Differentiation of Oligodendrocytes: Comparison of the CG-4 Glial Cell Line to Primary Cultures

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Abstract
The expression of cerebrosides, sulfatides, gangliosides and the myelin-associated glycoprotein (MAG) during differentiation of the CG-4 line of oligodendrocyte progenitors [Louis et al.: J. Neurosci Res 31: 193, 1992] was compared with their expression in primary cultures of oligodendrocyte precursors [McCarthy and de Vellis: J Cell Biol 85: 890, 1980]. When the CG-4 cells differentiated from bipolar progenitors to oligodendrocytes, there was a decrease of glucosylcerebroside synthesis and an increase in galactosylcerebroside and sulfatide synthesis. However, even after differentiation, the incorporation of [3H]galactose into these glycolipids, the amounts of galactosylcerebroside and sulfatide, and the galactocerebroside/sulfatide ratio were all much less than in primary cultures of differentiating oligodendrocytes. The major gangliosides in differentiated primary oligodendrocyte cultures were GM3 and GD3, and GD3 was also a major ganglioside in the CG-4 line. However, unlike primary cultures of O-2A lineage cells in which GM3 synthesis increased dramatically during differentiation to oligodendrocytes, the CG-4 cells expressed very little GM3. Also, the CG-4 cells expressed larger amounts of more complex gangliosides, e.g. GD1b and GT1b, which were almost entirely restricted to the b-series. The amount of MAG expressed by the CG-4 cells increased substantially when they differentiated to oligodendrocytes, and it was almost all the large immature isoform. However, even after differentiation, the amount expressed was less than in differentiated primary oligodendrocyte cultures. Overall, the lower expression of myelin-related glycolipids and MAG by the CG-4 line suggests a lesser degree of differentiation in comparison to primary oligodendrocytes under the culture conditions of these experiments, but the larger amounts of cells available from the CG-4 line should be useful for investigating glycolipid and MAG function related to the early stages of myelinogenesis.

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