title: Influence of the blood-CSF-barrier function on S100B in neurodegenerative diseases.
abstract: OBJECTIVE
  S100B was proposed to be a CSF and blood biomarker in a number of neurological diseases. The route of S100B to the CSF and the blood in neurodegenerative diseases is unclear. To assess the impact of the physiological or impaired blood-CSF-barrier (BCSFB) function on S100B concentrations in CSF and serum, we analysed S100B in correlation of the albumin quotient.
  
  
  METHODS
  S100Bserum and S100BCSF were quantified in samples from patients with a variety of neurological diseases using an immunoluminometric assay (Sangtec LIA-mat). Measures were analysed for a potential relation to the CSF/serum-albumin quotient (Qalb ), which indicates the BCSFB functionality.
  
  
  RESULTS
  We reasserted increased S100B concentrations in CSF and serum of CJD patients. Elevated S100Bserum correlated with elevated S100BCSF in all diagnoses but with exceptions. Neither S100BCSF nor S100Bserum did correlate with Qalb , even when the BCSFB function was progressively impaired as demonstrated by increased Qalb .
  
  
  CONCLUSIONS
  The lack of correlation between Qalb and S100BCSF is typically seen for proteins which are brain derived. Therefore, we propose that S100B enters the blood with the bulk flow via Pacchioni's granules and along the spinal nerve sheaths.
authors.affiliation: Department of Neurology, University of Ulm, Ulm, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Steinacker
authors.forename: K
authors.initials: K
authors.lastname: Weidehaas
authors.forename: L
authors.initials: L
authors.lastname: Cepek
authors.forename: E
authors.initials: E
authors.lastname: Feneberg
authors.forename: H A
authors.initials: HA
authors.lastname: Kretzschmar
authors.forename: M
authors.initials: M
authors.lastname: Otto
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001812:Blood-Brain Barrier / Q000503:physiopathology*; D007562:Creutzfeldt-Jakob Syndrome / Q000097:blood / Q000134:cerebrospinal fluid / Q000473:pathology; D005260:Female; D006801:Humans; D007118:Immunoassay; D008297:Male; D008875:Middle Aged; D019636:Neurodegenerative Diseases / Q000097:blood / Q000134:cerebrospinal fluid / Q000473:pathology; D064568:S100 Calcium Binding Protein beta Subunit / Q000097:blood* / Q000134:cerebrospinal fluid*; D012709:Serum Albumin / Q000032:analysis; D018709:Statistics, Nonparametric
chemical_list: D064568:S100 Calcium Binding Protein beta Subunit; D012709:Serum Albumin
keywords: Creutzfeldt-Jakob disease; S100B; albumin quotient; blood-cerebrospinal fluid barrier; cerebrospinal fluid flow