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Publication : Biglycan is an extracellular MuSK binding protein important for synapse stability.

First Author  Amenta AR Year  2012
Journal  J Neurosci Volume  32
Issue  7 Pages  2324-34
PubMed ID  22396407 Mgi Jnum  J:181611
Mgi Id  MGI:5312147 Doi  10.1523/JNEUROSCI.4610-11.2012
Citation  Amenta AR, et al. (2012) Biglycan Is an Extracellular MuSK Binding Protein Important for Synapse Stability. J Neurosci 32(7):2324-2334
abstractText  The receptor tyrosine kinase MuSK is indispensable for nerve-muscle synapse formation and maintenance. MuSK is necessary for prepatterning of the endplate zone anlage and as a signaling receptor for agrin-mediated postsynaptic differentiation. MuSK-associated proteins such as Dok7, LRP4, and Wnt11r are involved in these early events in neuromuscular junction formation. However, the mechanisms regulating synapse stability are poorly understood. Here we examine a novel role for the extracellular matrix protein biglycan in synapse stability. Synaptic development in fetal and early postnatal biglycan null (bgn(-/o)) muscle is indistinguishable from wild-type controls. However, by 5 weeks after birth, nerve-muscle synapses in bgn(-/o) mice are abnormal as judged by the presence of perijunctional folds, increased segmentation, and focal misalignment of acetylcholinesterase and AChRs. These observations indicate that previously occupied presynaptic and postsynaptic territory has been vacated. Biglycan binds MuSK and the levels of this receptor tyrosine kinase are selectively reduced at bgn(-/o) synapses. In bgn(-/o) myotubes, the initial stages of agrin-induced MuSK phosphorylation and AChR clustering are normal, but the AChR clusters are unstable. This stability defect can be substantially rescued by the addition of purified biglycan. Together, these results indicate that biglycan is an extracellular ligand for MuSK that is important for synapse stability.
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