title: Severity and patterns of blood-nerve barrier breakdown in patients with chronic inflammatory demyelinating polyradiculoneuropathy: correlations with clinical subtypes.
abstract: OBJECTIVE
  Chronic inflammatory demyelinating polyradiculoneuropathy (CIDP) is currently classified into clinical subtypes, including typical and atypical forms (multifocal acquired demyelinating sensory and motor neuropathy (MADSAM) and distal acquired demyelinating symmetric neuropathy (DADS)). The aim of this study was to elucidate the patterns and severity of breakdown of the blood-nerve barrier (BNB) in each CIDP subtype.
  
  
  METHODS
  We evaluated the effects of sera obtained from patients with typical CIDP, MADSAM and DADS and control subjects on the expression levels of tight junction proteins and transendothelial electrical resistance (TEER) value in human peripheral nerve microvascular endothelial cells (PnMECs).
  
  
  RESULTS
  The sera obtained from the patients with the three clinical phenotypes of CIDP decreased the amount of claudin-5 protein levels and TEER values in the PnMECs. In addition, the sera obtained from typical CIDP patients more prominently reduced claudin-5 protein levels and TEER values in the PnMECs than did that obtained from the MADSAM and DADS patients. Furthermore, the severity of BNB disruption after exposure to the sera was associated with higher Hughes grade, lower MRC score, more pronounced slowing of motor nerve conduction in the median nerve and higher frequency of abnormal temporal dispersion.
  
  
  CONCLUSIONS
  Sera derived from typical CIDP patients destroy the BNB more severely than those from MADSAM or DADS patients. The extent of BNB disruption in the setting of CIDP is associated with clinical disability and demyelination in the nerve trunk. These observations may explain the phenotypical differences between CIDP subtypes.
authors.affiliation: Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Ube, Japan.
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Shimizu
authors.affiliation: Department of Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan.
authors.forename: Setsu
authors.initials: S
authors.lastname: Sawai
authors.affiliation: Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Ube, Japan.
authors.forename: Yasuteru
authors.initials: Y
authors.lastname: Sano
authors.affiliation: Department of Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan.
authors.forename: Minako
authors.initials: M
authors.lastname: Beppu
authors.affiliation: Department of Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan.
authors.forename: Sonoko
authors.initials: S
authors.lastname: Misawa
authors.affiliation: Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Ube, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Nishihara
authors.affiliation: Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Ube, Japan.
authors.forename: Michiaki
authors.initials: M
authors.lastname: Koga
authors.affiliation: Department of Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kuwabara
authors.affiliation: Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Ube, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kanda
mesh_terms: D049428:Blood-Nerve Barrier / Q000503:physiopathology*; D015153:Blotting, Western; D062507:Claudin-5 / Q000097:blood; D017097:Electric Impedance; D042783:Endothelial Cells / Q000502:physiology; D006801:Humans; D020277:Polyradiculoneuropathy, Chronic Inflammatory Demyelinating / Q000097:blood / Q000145:classification / Q000503:physiopathology*; D018709:Statistics, Nonparametric; D062725:Tight Junction Proteins / Q000378:metabolism*
chemical_list: C107466:CLDN5 protein, human; D062507:Claudin-5; D062725:Tight Junction Proteins
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