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He T, Chen K, Li Y, Luo Z, Luo M, Yang H. Clinical Features and Prognostic Analysis of MuSK-Antibody-Positive Myasthenia Gravis versus Double-Seropositive Myasthenia Gravis: A Single-Center Study from Central South China. Neuropsychiatr Dis Treat 2024; 20:725-735. [PMID: 38566882 PMCID: PMC10986406 DOI: 10.2147/ndt.s450651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Accepted: 03/13/2024] [Indexed: 04/04/2024] Open
Abstract
Purpose To decipher the discrepancies between muscle-specific kinase antibody-positive myasthenia gravis (MuSK-MG) and double-seropositive myasthenia gravis (DSP-MG), and to determine prognostic factors for minimal manifestation status (MMS) achievement in MG patients with MuSK autoantibodies (MuSK-Ab). Patients and Methods A total of 34 MG patients seropositive for MuSK-Ab were enrolled in this study. The demographic and clinical features were compared between MuSK-MG (n = 28) and DSP-MG (n = 6) patients, and factors affecting MMS induction in all patients with MuSK-Ab were identified using Cox regression analysis. Results Compared to MuSK-MG patients, those with DSP-MG had similar clinical characteristics, except that they had a lower frequency of bulbar muscle involvement at nadir (50% vs 92.9%; P = 0.029) and higher proportions of comorbidities with diabetes mellitus (33.3% vs 0%; P = 0.027) and thymic abnormalities (33.3% vs 0%; P = 0.027). Higher MG Activities of Daily Living (MG-ADL) scores (HR = 0.16, 95% CI: 0.037-0.7, P = 0.015) and axial muscle involvement at nadir (HR = 0.39, 95% CI: 0.16-0.94, P = 0.035) were negative prognostic factors for MMS achievement in patients with MuSK-Ab regardless of acetylcholine receptor antibody (AChR-Ab) positivity. Multivariable Cox regression analysis further established higher MG-ADL scores at the nadir (HR = 0.19, 95% CI: 0.04-0.94; P = 0.042) as an independent risk factor for MMS achievement. Conclusion DSP-MG was comparable to MuSK-MG and could be considered a single entity in our cohort. In all MG patients with MuSK-Ab, a higher MG-ADL score at nadir may herald a lower chance of MMS achievement, with no observed potential effect of AChR-Ab presence.
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Affiliation(s)
- Ting He
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, 410008, People’s Republic of China
| | - Kangzhi Chen
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, 410008, People’s Republic of China
| | - Yi Li
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, 410008, People’s Republic of China
| | - Zhaohui Luo
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, 410008, People’s Republic of China
| | - Mengchuan Luo
- Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, 410008, People’s Republic of China
| | - Huan Yang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, 410008, People’s Republic of China
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Vakrakou AG, Karachaliou E, Chroni E, Zouvelou V, Tzanetakos D, Salakou S, Papadopoulou M, Tzartos S, Voumvourakis K, Kilidireas C, Giannopoulos S, Tsivgoulis G, Tzartos J. Immunotherapies in MuSK-positive Myasthenia Gravis; an IgG4 antibody-mediated disease. Front Immunol 2023; 14:1212757. [PMID: 37564637 PMCID: PMC10410455 DOI: 10.3389/fimmu.2023.1212757] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 07/05/2023] [Indexed: 08/12/2023] Open
Abstract
Muscle-specific kinase (MuSK) Myasthenia Gravis (MG) represents a prototypical antibody-mediated disease characterized by predominantly focal muscle weakness (neck, facial, and bulbar muscles) and fatigability. The pathogenic antibodies mostly belong to the immunoglobulin subclass (Ig)G4, a feature which attributes them their specific properties and pathogenic profile. On the other hand, acetylcholine receptor (AChR) MG, the most prevalent form of MG, is characterized by immunoglobulin (Ig)G1 and IgG3 antibodies to the AChR. IgG4 class autoantibodies are impotent to fix complement and only weakly bind Fc-receptors expressed on immune cells and exert their pathogenicity via interfering with the interaction between their targets and binding partners (e.g. between MuSK and LRP4). Cardinal differences between AChR and MuSK-MG are the thymus involvement (not prominent in MuSK-MG), the distinct HLA alleles, and core immunopathological patterns of pathology in neuromuscular junction, structure, and function. In MuSK-MG, classical treatment options are usually less effective (e.g. IVIG) with the need for prolonged and high doses of steroids difficult to be tapered to control symptoms. Exceptional clinical response to plasmapheresis and rituximab has been particularly observed in these patients. Reduction of antibody titers follows the clinical efficacy of anti-CD20 therapies, a feature implying the role of short-lived plasma cells (SLPB) in autoantibody production. Novel therapeutic monoclonal against B cells at different stages of their maturation (like plasmablasts), or against molecules involved in B cell activation, represent promising therapeutic targets. A revolution in autoantibody-mediated diseases is pharmacological interference with the neonatal Fc receptor, leading to a rapid reduction of circulating IgGs (including autoantibodies), an approach already suitable for AChR-MG and promising for MuSK-MG. New precision medicine approaches involve Chimeric autoantibody receptor T (CAAR-T) cells that are engineered to target antigen-specific B cells in MuSK-MG and represent a milestone in the development of targeted immunotherapies. This review aims to provide a detailed update on the pathomechanisms involved in MuSK-MG (cellular and humoral aberrations), fostering the understanding of the latest indications regarding the efficacy of different treatment strategies.
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Affiliation(s)
- Aigli G. Vakrakou
- First Department of Neurology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Eleni Karachaliou
- Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Elisabeth Chroni
- Department of Neurology, School of Medicine, University of Patras, Patras, Greece
| | - Vasiliki Zouvelou
- First Department of Neurology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Dimitrios Tzanetakos
- Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Stavroula Salakou
- Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Marianna Papadopoulou
- Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
- Department of Physiotherapy, University of West Attica, Athens, Greece
| | - Socrates Tzartos
- Tzartos NeuroDiagnostics, Athens, Greece
- Department of Neurobiology, Hellenic Pasteur Institute, Athens, Greece
- Department of Pharmacy, University of Patras, Patras, Greece
| | - Konstantinos Voumvourakis
- Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Constantinos Kilidireas
- First Department of Neurology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
- Department of Neurology, Henry Dunant Hospital Center, Athens, Greece
| | - Sotirios Giannopoulos
- Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Georgios Tsivgoulis
- Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
- Department of Neurology, The University of Tennessee Health Science Center, Memphis, TN, United States
| | - John Tzartos
- Second Department of Neurology, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
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Seth V, Kushwaha S, Bapat P, Rajashekar K, Grover D. Is double-seropositive myasthenia gravis a distinct subtype? Acta Neurol Belg 2023; 123:251-252. [PMID: 34309787 DOI: 10.1007/s13760-021-01759-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 07/15/2021] [Indexed: 11/28/2022]
Affiliation(s)
- Vaibhav Seth
- DM Neurology Resident, Institute of Human Behaviour and Allied Sciences, Delhi, India.
| | - Suman Kushwaha
- Head of the Department, Institute of Human Behaviour and Allied Sciences, Delhi, India
| | - Prateek Bapat
- DM Neurology Resident, Institute of Human Behaviour and Allied Sciences, Delhi, India
| | - KiranGowda Rajashekar
- DM Neurology Resident, Institute of Human Behaviour and Allied Sciences, Delhi, India
| | - Deepti Grover
- DM Neurology Resident, Institute of Human Behaviour and Allied Sciences, Delhi, India
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Pugliese A, Nicocia G, Messina S, Toscano A, Rodolico C. A very late onset AChR and MuSK double positive myasthenia gravis: a case description and literature review. Neuromuscul Disord 2023; 33:145-147. [PMID: 36628839 DOI: 10.1016/j.nmd.2022.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 11/06/2022] [Accepted: 12/12/2022] [Indexed: 12/14/2022]
Abstract
AChR and MuSK double positive myasthenia gravis has been rarely reported. Generally, it occurs in children and adults after thymectomy or immunotherapy. Furthermore, in a few patients with bulbar or respiratory involvement, MuSK antibodies might be detected after clinical deterioration. We report a man with a very late onset myasthenia gravis (86-year-old) and the coexistence of both antibodies at the time of the diagnosis. Despite the presence of MuSK antibodies, he manifested no bulbar symptoms and had a favorable clinical outcome. However, side effects related to low dose pyridostigmine were evident. Hence, double positivity can also occur in elderly and in more benign forms of myasthenia gravis. Other cases of AChR and MuSK double positive myasthenia gravis could allow a better definition of this condition.
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Affiliation(s)
- A Pugliese
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - G Nicocia
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - S Messina
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - A Toscano
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - C Rodolico
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy.
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AChRAb and MuSKAb double-seropositive myasthenia gravis: a distinct subtype? Neurol Sci 2021; 42:863-869. [PMID: 33438140 PMCID: PMC7870615 DOI: 10.1007/s10072-021-05042-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 01/04/2021] [Indexed: 11/07/2022]
Abstract
Introduction This study investigated the characteristics of double-seropositive myasthenia gravis (DSP-MG) in southern China for disease subtype classification. Methods A case-control study was carried out in which the characteristics of DSP-MG patients (n = 17) were compared to those of muscle-specific tyrosine kinase antibody-positive (MuSK)-MG and acetylcholine receptor antibody-positive (AChR)-MG patients (n = 8 and 27, respectively). We also performed a literature review of DSP-MG patients. Results Compared to AChR-MG, DSP-MG had greater bulbar dysfunction (47.1% vs 18.6%, P = 0.04), higher incidence of myasthenia crisis (41.2% vs 14.8%, P = 0.04), more severe Myasthenia Gravis Foundation of America classification at maximum worsening, greater autoantibody abnormalities (70.6% vs 33.3%, P = 0.015), greater need for immunosuppressant treatment (58.8% vs 3.7%, P < 0.001), and worse prognosis with less remission (11.8% vs 55.6%, P = 0.001). There were no differences between DSP-MG and MuSK-MG patients. DSP-MG described in published reports was comparable to MuSK-MG. Discussion DSP-MG in southern China may be a subtype of MuSK-MG.
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Zouvelou V, Psimenou E. AChR-and MuSK-positive myasthenia gravis: Double trouble. J Neuroimmunol 2020; 348:577364. [DOI: 10.1016/j.jneuroim.2020.577364] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 08/14/2020] [Accepted: 08/17/2020] [Indexed: 11/30/2022]
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Zhu M, Lennon VA. Double seropositivity for AChR and MuSK autoantibodies in myasthenia gravis. Neuromuscul Disord 2020; 30:533. [DOI: 10.1016/j.nmd.2020.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rivner MH, Pasnoor M, Dimachkie MM, Barohn RJ, Mei L. Muscle-Specific Tyrosine Kinase and Myasthenia Gravis Owing to Other Antibodies. Neurol Clin 2019; 36:293-310. [PMID: 29655451 DOI: 10.1016/j.ncl.2018.01.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Around 20% of patients with myasthenia gravis are acetylcholine receptor antibody negative; muscle-specific tyrosine kinase antibodies (MuSK) were identified as the cause of myasthenia gravis in 30% to 40% of these cases. Anti MuSK myasthenia gravis is associated with specific clinical phenotypes. One is a bulbar form with fewer ocular symptoms. Others show an isolated head drop or symptoms indistinguishable from acetylcholine receptor-positive myasthenia gravis. These patients usually respond well to immunosuppressive therapy, but not as well to cholinesterase inhibitors. Other antibodies associated with myasthenia gravis, including low-density lipoprotein receptor-related protein 4, are discussed.
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Affiliation(s)
- Michael H Rivner
- EMG Lab, Augusta University, 1120 15th Street, BP-4390, Augusta, GA 30912, USA.
| | - Mamatha Pasnoor
- Department of Neurology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA
| | - Mazen M Dimachkie
- Department of Neurology, University of Kansas Medical Center, 3599 Rainbow Boulevard, Mail Stop 2012, Kansas City, KS 66103, USA
| | - Richard J Barohn
- Department of Neurology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Mail Stop 4017, Kansas City, KS 66160, USA
| | - Lin Mei
- Department of Neuroscience and Regenerative Medicine, Augusta University, 1120 15th Street, CA-2014, Augusta, GA 30912, USA
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Kushlaf H, Li Y. The evidence is stacked against thymectomy in MuSK myasthenia gravis. Muscle Nerve 2019; 59:393-394. [PMID: 30701589 DOI: 10.1002/mus.26439] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Revised: 01/26/2019] [Accepted: 01/28/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Hani Kushlaf
- Department of Neurology and Rehabilitation Medicine, University of Cincinnati, Cincinnati, Ohio, USA
| | - Yuebing Li
- Neuromuscular Center, Neurological Institute, Cleveland Clinic, 9500 Euclid Avenue, Desk S90, Cleveland, Ohio 44195, USA
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Bokoliya SC, Kumar VP, Nashi S, Polavarapu K, Nalini A, Patil SA. Anti-AChR, MuSK, and LRP4 antibodies coexistence: A rare and distinct subtype of myasthenia gravis from Indian subcontinent. Clin Chim Acta 2018; 486:34-35. [DOI: 10.1016/j.cca.2018.07.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 05/14/2018] [Accepted: 07/09/2018] [Indexed: 11/16/2022]
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Li M, Ren L, Zhang Y, Lv J, Fang H, Zhang J, Zhao X, Han J, Huang P, Du Y, Zhang Q, Yang J, Zhang Y, Gao F. Clinical characteristics of AChRAb and MuSKAb double seropositive myasthenia gravis patients. Clin Neurol Neurosurg 2018; 172:69-73. [DOI: 10.1016/j.clineuro.2018.06.041] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 05/22/2018] [Accepted: 06/30/2018] [Indexed: 01/02/2023]
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Morren J, Li Y. Myasthenia gravis with muscle-specific tyrosine kinase antibodies: A narrative review. Muscle Nerve 2018; 58:344-358. [DOI: 10.1002/mus.26107] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 02/09/2018] [Accepted: 02/18/2018] [Indexed: 12/14/2022]
Affiliation(s)
- John Morren
- Neuromuscular Center, Neurological Institute, Cleveland Clinic, 9500 Euclid Avenue, Desk S90; Cleveland Ohio 44195 USA
| | - Yuebing Li
- Neuromuscular Center, Neurological Institute, Cleveland Clinic, 9500 Euclid Avenue, Desk S90; Cleveland Ohio 44195 USA
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Double-seropositive myasthenia gravis with acetylcholine receptor and low-density lipoprotein receptor-related protein 4 antibodies associated with invasive thymoma. Neuromuscul Disord 2017; 27:914-917. [PMID: 28694075 DOI: 10.1016/j.nmd.2017.06.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 05/13/2017] [Accepted: 06/01/2017] [Indexed: 01/06/2023]
Abstract
We describe two cases of myasthenia gravis (MG) with double seropositivity for acetylcholine receptor (AChR) and low-density lipoprotein receptor-related protein 4 (LRP4) antibodies (AChR/LRP4-MG) with invasive thymoma. Both cases showed myasthenic weakness, which was restricted to the ocular muscles for >5 months from onset, and then unprovoked severe clinical deterioration supervened with predominant bulbar symptoms. The patients responded adequately to therapeutic intervention. Serum AChR antibody levels at post-intervention were markedly decreased, whereas LRP4 antibodies were almost unchanged in case 1 and slightly decreased in case 2. Although our results suggest that patients with AChR/LRP4-MG are likely to present with more severe symptoms than those with LRP4-MG, none of the previously reported cases had thymomas. Coexistence of autoantibodies may reflect breakdown of self-tolerance caused by invasive thymomas. The main cause affecting symptoms of MG in our cases was probably AChR antibodies, and anti-LRP4 antibodies might have been an exacerbating factor.
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Hong Y, Li HF, Skeie GO, Romi F, Hao HJ, Zhang X, Gao X, Owe JF, Gilhus NE. Autoantibody profile and clinical characteristics in a cohort of Chinese adult myasthenia gravis patients. J Neuroimmunol 2016; 298:51-7. [DOI: 10.1016/j.jneuroim.2016.07.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 06/27/2016] [Accepted: 07/01/2016] [Indexed: 11/24/2022]
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Wang J, Wu X, Deng H, Liu Y, Liu H, Fan X, Liu K, Wu J, Zhang HL. Response to rituximab in an anti-muscle-specific receptor tyrosine kinase- and anti-acetylcholine recepto-double-positive myasthenia gravis patient concomitant with follicular dendritic cell sarcoma. ACTA ACUST UNITED AC 2016; 21:77-8. [PMID: 26818174 PMCID: PMC5224420 DOI: 10.17712/nsj.2016.1.20150483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Jianmeng Wang
- Department of Neurology, the First Hospital of Jilin University, Jilin University, Changchun, China
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Switch to double positive late onset MuSK myasthenia gravis following thymomectomy in paraneoplastic AChR antibody positive myasthenia gravis. J Neurol 2015; 263:174-6. [DOI: 10.1007/s00415-015-7982-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 11/10/2015] [Accepted: 11/16/2015] [Indexed: 10/22/2022]
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Clinical application of clustered-AChR for the detection of SNMG. Sci Rep 2015; 5:10193. [PMID: 26068604 PMCID: PMC4464178 DOI: 10.1038/srep10193] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 04/02/2015] [Indexed: 11/08/2022] Open
Abstract
Myasthenia gravis (MG) is an autoantibody-mediated disease of the neuromuscular junction (NMJ). However, accumulating evidence has indicated that MG patients whose serum anti-acetylcholine receptor (AChR) antibodies are not detectable (serumnegative MG; SNMG) in routine assays share similar clinical features with anti-AChR antibody-positive MG patients. We hypothesized that SNMG patients would have low-affinity antibodies to AChRs that would not be detectable using traditional methods but that might be detected by binding to AChR on the cell membrane, particularly if they were clustered at the high density observed at the NMJ. We expressed AChR subunits with the clustering protein rapsyn (an AChR-associated protein at the synapse) in human embryonic kidney (HEK) cells, and we tested the binding of the antibodies using immunofluorescence. With this approach, AChR antibodies to rapsyn-clustered AChR could be detected in the sera from 45.83% (11/24) of SNMG patients, as confirmed with fluorescence-activated cell sorting (FACS). This was the first application in China of cell-based AChR antibody detection. More importantly, this sensitive (and specific) approach could significantly increase the diagnosis rate of SNMG.
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Predictors of outcome of myasthenic crisis. Neurol Sci 2014; 36:801-2. [PMID: 25060650 DOI: 10.1007/s10072-014-1906-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 07/22/2014] [Indexed: 02/02/2023]
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