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Glycobiology, 2002, Vol. 12, No. 1 1R-7R
© 2002 Oxford University Press

MINI REVIEW

Glycobiology of the synapse

Paul T. Martin

Department of Neurosciences, Glycobiology Research and Training Center, University of California, San Diego, School of Medicine, 9500 Gilman Drive, La Jolla, CA 92093-0691

Abstract

Synapses are the fundamental units of connectivity that link together the nervous system. Lectin studies from 30 years ago suggested that specific glycans are concentrated at neuromuscular synapses in the peripheral nervous system and at excitatory synapses in the brain. Subsequent studies have confirmed that particular glycan structures are localized at these synapses, including polysialic acid, high mannose, the cytotoxic T cell antigen, and forms of heparan sulfate. Though the role of these molecules in synapse formation and function is still poorly understood, there is increasing evidence that the function of agrin, a synaptogenic factor in neuromuscular formation, is modulated by several glycans. In addition, the recent generation of ST8SiaIV null mice strongly suggests a role for polysialic acid in synaptic plasticity in the some regions of the central nervous system.


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