PMID- 29125188 OWN - NLM STAT- MEDLINE DCOM- 20190729 LR - 20190729 IS - 1749-6632 (Electronic) IS - 0077-8923 (Linking) VI - 1412 IP - 1 DP - 2018 Jan TI - The mouse passive-transfer model of MuSK myasthenia gravis: disrupted MuSK signaling causes synapse failure. PG - 54-61 LID - 10.1111/nyas.13513 [doi] AB - While the majority of myasthenia gravis patients express antibodies targeting the acetylcholine receptor, the second most common cohort instead displays autoantibodies against muscle-specific kinase (MuSK). MuSK is a transmembrane tyrosine kinase found in the postsynaptic membrane of the neuromuscular junction. During development, MuSK serves as a signaling hub, coordinating the alignment of the pre- and postsynaptic components of the synapse. Adult mice that received repeated daily injections of IgG from anti-MuSK(+) myasthenia gravis patients developed muscle weakness, associated with neuromuscular transmission failure. MuSK autoantibodies are predominantly of the IgG4 type. They suppress the kinase activity of MuSK and the phosphorylation of target proteins in the postsynaptic membrane. Loss of postsynaptic acetylcholine receptors is the primary cause of neuromuscular transmission failure. MuSK autoantibodies also disrupt the capacity of the motor nerve terminal to adaptively increase acetylcholine release in response to the reduced postsynaptic responsiveness to acetylcholine. The passive IgG transfer model of MuSK myasthenia gravis has been used to test candidate treatments. Pyridostigmine, a first-line cholinesterase inhibitor drug, exacerbated the disease process, while 3,4-diaminopyridine and albuterol were found to be beneficial in this mouse model. CI - (c) 2017 New York Academy of Sciences. FAU - Ghazanfari, Nazanin AU - Ghazanfari N AD - Physiology and Bosch Institute, University of Sydney, Sydney, New South Wales, Australia. FAU - Trajanovska, Sofie AU - Trajanovska S AD - Physiology and Bosch Institute, University of Sydney, Sydney, New South Wales, Australia. FAU - Morsch, Marco AU - Morsch M AD - Physiology and Bosch Institute, University of Sydney, Sydney, New South Wales, Australia. AD - Department of Biomedical Sciences, Macquarie University, Sydney, New South Wales, Australia. FAU - Liang, Simon X AU - Liang SX AD - Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Liaoning Medical University, Jinzhou, China. FAU - Reddel, Stephen W AU - Reddel SW AD - Department of Molecular Medicine, Concord Hospital, Sydney, New South Wales, Australia. FAU - Phillips, William D AU - Phillips WD AD - Physiology and Bosch Institute, University of Sydney, Sydney, New South Wales, Australia. LA - eng PT - Journal Article PT - Review DEP - 20171110 PL - United States TA - Ann N Y Acad Sci JT - Annals of the New York Academy of Sciences JID - 7506858 RN - 0 (Cholinesterase Inhibitors) RN - 0 (Muscle Proteins) RN - 0 (Receptors, Cholinergic) RN - 0 (peripheral membrane protein 43K) RN - EC 2.7.10.1 (MuSK protein, mouse) RN - EC 2.7.10.1 (Receptor Protein-Tyrosine Kinases) MH - Animals MH - Cholinesterase Inhibitors/pharmacology MH - Female MH - Humans MH - Immunization, Passive MH - Mice MH - Muscle Proteins/metabolism MH - Myasthenia Gravis, Autoimmune, Experimental/*etiology/immunology/physiopathology MH - Receptor Protein-Tyrosine Kinases/*antagonists & inhibitors/*immunology/physiology MH - Receptors, Cholinergic/immunology/metabolism MH - Synapses/immunology/physiology OTO - NOTNLM OT - mouse models OT - muscle-specific kinase OT - myasthenia gravis OT - neuromuscular disease OT - neuromuscular junction EDAT- 2017/11/11 06:00 MHDA- 2019/07/30 06:00 CRDT- 2017/11/11 06:00 PHST- 2017/07/25 00:00 [received] PHST- 2017/09/05 00:00 [revised] PHST- 2017/09/09 00:00 [accepted] PHST- 2017/11/11 06:00 [pubmed] PHST- 2019/07/30 06:00 [medline] PHST- 2017/11/11 06:00 [entrez] AID - 10.1111/nyas.13513 [doi] PST - ppublish SO - Ann N Y Acad Sci. 2018 Jan;1412(1):54-61. doi: 10.1111/nyas.13513. Epub 2017 Nov 10.