Gangliosides of the CNS Myelin Membrane
Myelin gangliosides have a number of unusual properties that set them apart from gangliosides of most other nervous system membranes. One is their low concentration, which in the case of rat amounts to about one-tenth that in synaptic plasma membranes. This may account for the fact that when first detected in isolated myelin1,2 they were believed to represent neuronal contamination. Subsequent studies of Suzuki and coworkers3,4,5 provided strong if not conclusive evidence that they are intrinsic to myelin itself. A key finding in those studies was the distinctive pattern of molecular distribution, the main feature of which was a high proportion of GM1. The same phenomenon was later observed in myelin from man6 and mouse7. We have undertaken a survey of several other vertebrates to assess possible variations in pattern and concentration.
KeywordsSialic Acid Optic Tract Species Comparison Synaptic Plasma Membrane Brain Ganglioside
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