Abstract:
OBJECTIVE:Charcot-Marie-Tooth type 4J (CMT4J) is a rare autosomal recessive neuropathy caused by mutations in FIG4 that result in loss of FIG4 protein. This study investigates the natural history and mechanisms of segmental demyelination in CMT4J. METHODS:Over the past 9 years, we have enrolled and studied a cohort of 12 CMT4J patients, including 6 novel FIG4 mutations. We evaluated these patients and related mouse models using morphological, electrophysiological, and biochemical approaches. RESULTS:We found sensory motor demyelinating polyneuropathy consistently in all patients. This underlying myelin pathology was associated with nonuniform slowing of conduction velocities, conduction block, and temporal dispersion on nerve conduction studies, which resemble those features in acquired demyelinating peripheral nerve diseases. Segmental demyelination was also confirmed in mice without Fig4 (Fig4-/- ). The demyelination was associated with an increase of Schwann cell dedifferentiation and macrophages in spinal roots where nerve-blood barriers are weak. Schwann cell dedifferentiation was induced by the increasing intracellular Ca2+ . Suppression of Ca2+ level by a chelator reduced dedifferentiation and demyelination of Schwann cells in vitro and in vivo. Interestingly, cell-specific knockout of Fig4 in mouse Schwann cells or neurons failed to cause segmental demyelination. INTERPRETATION:Myelin change in CMT4J recapitulates the features of acquired demyelinating neuropathies. This pathology is not Schwann cell autonomous. Instead, it relates to systemic processes involving interactions of multiple cell types and abnormally elevated intracellular Ca2+ . Injection of a Ca2+ chelator into Fig4-/- mice improved segmental demyelination, thereby providing a therapeutic strategy against demyelination. Ann Neurol 2018;83:756-770.
journal_name
Ann Neuroljournal_title
Annals of neurologyauthors
Hu B,McCollum M,Ravi V,Arpag S,Moiseev D,Castoro R,Mobley B,Burnette B,Siskind C,Day J,Yawn R,Feely S,Li Y,Yan Q,Shy M,Li Jdoi
10.1002/ana.25198subject
Has Abstractpub_date
2018-04-01 00:00:00pages
756-770issue
4eissn
0364-5134issn
1531-8249journal_volume
83pub_type
杂志文章abstract::alpha 1-Antichymotrypsin (ACT) is a serine protease inhibitor that is markedly elevated in the serum and cerebrospinal fluid of patients with Alzheimer's disease (AD). Patients with Down's syndrome are known to develop neuropathological changes of AD by age 40 years and many become demented. Therefore, in the present ...
journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410320211
更新日期:1992-08-01 00:00:00
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journal_title:Annals of neurology
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journal_title:Annals of neurology
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doi:10.1002/ana.21767
更新日期:2009-11-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410290603
更新日期:1991-06-01 00:00:00
abstract::Reductions in cerebral metabolism sufficient to impair cognition in normal individuals also occur in Alzheimer's disease (AD). The degree of clinical disability in AD correlates closely to the magnitude of the reduction in brain metabolism. Therefore, we tested whether impairments in tricarboxylic acid (TCA) cycle enz...
journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.20474
更新日期:2005-05-01 00:00:00
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journal_title:Annals of neurology
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.21909
更新日期:2010-04-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.25044
更新日期:2017-10-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章,多中心研究,随机对照试验
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更新日期:2012-01-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.21058
更新日期:2007-02-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410130620
更新日期:1983-06-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410260212
更新日期:1989-08-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410370610
更新日期:1995-06-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410250606
更新日期:1989-06-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章,随机对照试验
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更新日期:2019-10-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:
更新日期:2000-12-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410010509
更新日期:1977-05-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410130118
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.20123
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journal_title:Annals of neurology
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410400607
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journal_title:Annals of neurology
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journal_title:Annals of neurology
pub_type: 杂志文章,多中心研究
doi:10.1002/ana.25545
更新日期:2019-09-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.23897
更新日期:2013-07-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.22222
更新日期:2011-05-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410420211
更新日期:1997-08-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:
更新日期:2000-02-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410200209
更新日期:1986-08-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.410430113
更新日期:1998-01-01 00:00:00
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journal_title:Annals of neurology
pub_type: 杂志文章
doi:10.1002/ana.24151
更新日期:2014-05-01 00:00:00