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Acetylcholine receptors are required for agrin-induced clustering of postsynaptic proteins

Marangi, P. Angelo, Forsayeth, John R., Mittaud, Peggy, Erb-Vögtli, Susanne, Blake, Derek J., Moransard, Martijn, Sander, Andreas and Fuhrer, Christian 2001. Acetylcholine receptors are required for agrin-induced clustering of postsynaptic proteins. The EMBO Journal 20 (24) , pp. 7060-7073. 10.1093/emboj/20.24.7060

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We have investigated the role of acetylcholine receptors (AChRs) in an early step of postsynaptic assembly at the neuromuscular synapse, the clustering of postsynaptic proteins induced by nerve-released agrin. To achieve this, we used two variants of C2 myotubes virtually lacking AChRs and C2 cells in which surface AChRs were down-regulated by AChR antibodies. In all cases, agrin caused normal clustering of the agrin receptor component MuSK, alpha-dystrobrevin and utrophin, but failed to aggregate AChRs, alpha- and beta-dystroglycan, syntrophin isoforms and rapsyn, an AChR–anchoring protein necessary for postsynaptic assembly and AChR clustering. In C2 variants, the stability of rapsyn was decreased, whereas in antibody-treated cells, rapsyn efficiently co-localized with remaining AChRs in microaggregates. Upon ectopic injection into myofibers in vivo, rapsyn did not form clusters in the absence of AChRs. These results show that AChRs and rapsyn are interdependent components of a pre-assembled protein complex that is required for agrin-induced clustering of a full set of postsynaptic proteins, thus providing evidence for an active role of AChRs in postsynaptic assembly.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Subjects: R Medicine > R Medicine (General)
Uncontrolled Keywords: acetylcholine receptor, agrin, neuromuscular junction, postsynaptic apparatus, rapsyn
Publisher: Nature Publishing Group
ISSN: 1460-2075
Last Modified: 04 Jun 2017 05:10

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