Myelin-associated glycoprotein inhibits neurite/axon growth and causes growth cone collapse

Journal of Neuroscience Research
M LiS David

Abstract

We have previously shown that myelin-associated glycoprotein (MAG) inhibits neurite growth from a neuronal cell line. In this study we show that 60% of axonal growth cones of postnatal day 1 hippocampal neurons collapsed when they encountered polystyrene beads coated with recombinant MAG (rMAG). Such collapse was not observed with denatured rMAG. Neurite growth from rat embryonic hippocampal and neonatal cerebellar neurons was also inhibited about 80% on tissue culture substrates coated with rMAG. To investigate further the inhibitory activity of MAG in myelin, we purified myelin from MAG-deficient mice and separated octylglucoside extracts of myelin by diethylaminoethyl (DEAE) ion-exchange chromatography. Although there was no significant difference in neurite growth on myelin purified from MAG-/- and MAG+/+ mice, differences were observed in the fractionated material. The major inhibitory peak that is associated with MAG in normal mice was significantly reduced in MAG-deficient mice. These results suggest that although MAG contributes significantly to axon growth inhibition associated with myelin, its lack in MAG-deficient mice is masked by other non-MAG inhibitors. Axon regeneration in these mice was also examined after thor...Continue Reading

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