Gangliosides are functional nerve cell ligands for myelin-associated glycoprotein (MAG), an inhibitor of nerve regeneration

Alka A. Vyas, Himatkumar V. Patel, Susan E. Fromholt, Marija Heffer-Lauc, Kavita A. Vyas, Jiyoung Dang, Melitta Schachner, Ronald L. Schnaar

Research output: Contribution to journalArticlepeer-review

Abstract

Myelin-associated glycoprotein (MAG) binds to the nerve cell surface and inhibits nerve regeneration. The nerve cell surface ligand(s) for MAG are not established, although sialic acid-bearing glycans have been implicated. We identify the nerve cell surface gangliosides GD1a and GT1b as specific functional ligands for MAG-mediated inhibition of neurite outgrowth from primary rat cerebellar granule neurons. MAG-mediated neurite outgrowth inhibition is attenuated by (i) neuraminiclase treatment of the neurons; (ii) blocking neuronal ganglioside biosynthesis; (iii) genetically modifying the terminal structures of nerve cell surface gangliosides; and (iv) adding highly specific IgG-class antiganglioside mAbs. Furthermore, neurite outgrowth inhibition is mimicked by highly multivalent clustering of GD1a or GT1b by using precomplexed antiganglioside Abs. These data implicate the nerve cell surface gangliosides GD1a and GT1b as functional MAG ligands and suggest that the first step in MAG inhibition is multivalent ganglioside clustering.

Original languageEnglish (US)
Pages (from-to)8412-8417
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume99
Issue number12
DOIs
StatePublished - Jun 11 2002
Externally publishedYes

ASJC Scopus subject areas

  • General

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