Adhesion molecule that mediates interactions between myelinating cells and neurons by binding to neuronal sialic acid-containing gangliosides and to the glycoproteins RTN4R and RTN4RL2. Not required for initial myelination, but seems to play a role in the maintenance of normal axon myelination. Protects motoneurons against apoptosis, also after injury; protection against apoptosis is probably mediated via interaction with neuronal RTN4R and RTN4RL2. Required to prevent degeneration of myelinated axons in adults; this probably depends on binding to gangliosides on the axon cell membrane. Negative regulator of neurite outgrowth that inhibits axon longitudinal growth. Negative regulator of neurite outgrowth; in dorsal root ganglion neurons the inhibition is mediated primarily via binding to neuronal RTN4R or RTN4RL2 and to a lesser degree via binding to neuronal gangliosides. In cerebellar granule cells the inhibition is mediated via binding to neuronal gangliosides. In sensory neurons, inhibition of neurite extension depends only partially on RTN4R, RTN4RL2 and gangliosides. Inhibits axon outgrowth by binding to RTN4R. Preferentially binds to alpha-2,3-linked sialic acid. Binds ganglioside Gt1b.
Gene References into Functions
The combination of trans ganglioside binding and cis homodimerization explains how MAG maintains the myelin-axon spacing and provides a mechanism for MAG-mediated bi-directional signalling.PMID:27922006
We show that myelin-associated glycoprotein or CNS myelin, in general, inhibit rodent Schwann cell migration and induce their death via cleavage of the neurotrophin receptor p75.PMID:28522736
Results show that MAG is important for axon-glia contact in a model for Charcot-Marie-Tooth disease type 1A, and suggest that its increased expression in patients has a compensatory role in the disease pathologyPMID:22940629
the apparent dependency on sulfatide for maintaining Nfasc155 and MAG associations is intriguing since the fatty acid composition of sulfatide is altered and paranodal ultrastructure is compromised in multiple sclerosisPMID:24081651
Heteronuclear ribonucleoprotein A1 interacts with an element that overlaps the 5' splice site of Mag exon 12.PMID:23704325
Ablation of neuronal ceramide synthase 1 in mice decreases ganglioside levels and expression of myelin-associated glycoprotein in oligodendrocytes.PMID:23074226
MAG-mediated axon protection against VNC is suppressed in CRMP4-/- DRG neurons.PMID:22583768
myelin-associated glycoprotein (MAG) performs distinct actions on the formation, maturation, degeneration and regeneration of sciatic nerve myelin sheath.PMID:21824506
This study suggested that MAG engages membrane-domain resident neuronal receptors to protect neurons from excitotoxicity, and that soluble MAG mitigates excitotoxic damage in vivo.PMID:21214567
Quaking I controls a unique cytoplasmic pathway that regulates alternative splicing of myelin-associated glycoprotein.PMID:20956316
While myelin-derived axon growth inhibitor MAG may modulate axon sprouting, it does not play a major role in central nervous system axon regeneration failure.PMID:20547125
The present study provides strong evidence that LPA-induced calpain activation plays a crucial role in the manifestation of neuropathic pain through MAG down-regulation in the DR.PMID:20420580
binds directly, with high affinity, to the receptor for NOGO (NgR);MAG and Nogo-66 activate NgR independently and serve as redundant NgR ligands that may limit axonal regeneration after CNS injuryPMID:12089450
MAG-positive shi/shi oligodendrocytes extend processes around axons and finally covered the axon.PMID:12125072
The absence of internodal tomacula in mice with a null mutation of the MAG gene supports a role for MAG in the maintenance of myelin at the paranodal regions.PMID:12365566
These results demonstrate that MAG expression is regulated in response to cortical axotomy, and indicate that it may limit axonal regeneration after CNS injury.PMID:15896979
MAG and complex gangliosides contribute to axon stability in both the CNS and PNS.PMID:15953602
Results describe the differential expression pattern and spatial distribution of L- and S-myelin-associated glycoprotein during development as well as in the adult central and peripheral nervous system.PMID:16442810
In conclusion, as MAG significantly improves the quality of axonal regeneration, it can be used as a new therapeutic approach for peripheral nerve repair with possible focal and temporary application.PMID:17705198
gangliosides inhibit neurite outgrowth by interacting with FRG motifs in the NgR1 and this interaction can also facilitate the binding of MAG to the NgR1PMID:18411262
MAG-deficient mutants present abnormalities in the structure of myelin sheaths and Ranvier nodes; combined deletion of MAG and Nogo-A causes severe transient hypomyelination.PMID:18632947
This report establishes for the first time that MAG also promotes resistance to axonal injury and prevents axonal degeneration both in cell culture and in vivo.PMID:19158290
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Subcellular Location
Cell membrane; Single-pass type I membrane protein. Membrane raft.
Protein Families
Immunoglobulin superfamily, SIGLEC (sialic acid binding Ig-like lectin) family
Tissue Specificity
Detected in the myelin tract in brain, especially in the corpus callosum and in peripheral nerve. Expressed by myelinating glial cells in the central and peripheral nervous system. Detected in oligodendrocyte processes before formation of compact myelin.