title: Establishing the proteome of normal human cerebrospinal fluid.
abstract: BACKGROUND
  Knowledge of the entire protein content, the proteome, of normal human cerebrospinal fluid (CSF) would enable insights into neurologic and psychiatric disorders. Until now technologic hurdles and access to true normal samples hindered attaining this goal.
  
  
  RESULTS
  We applied immunoaffinity separation and high sensitivity and resolution liquid chromatography-mass spectrometry to examine CSF from healthy normal individuals. 2630 proteins in CSF from normal subjects were identified, of which 56% were CSF-specific, not found in the much larger set of 3654 proteins we have identified in plasma. We also examined CSF from groups of subjects previously examined by others as surrogates for normals where neurologic symptoms warranted a lumbar puncture but where clinical laboratory were reported as normal. We found statistically significant differences between their CSF proteins and our non-neurological normals. We also examined CSF from 10 volunteer subjects who had lumbar punctures at least 4 weeks apart and found that there was little variability in CSF proteins in an individual as compared to subject to subject.
  
  
  CONCLUSIONS
  Our results represent the most comprehensive characterization of true normal CSF to date. This normal CSF proteome establishes a comparative standard and basis for investigations into a variety of diseases with neurological and psychiatric features.
authors.affiliation: Department of Medicine, University of Medicine and Dentistry of New Jersey-New Jersey Medical School, Newark, New Jersey, USA. schutzer@umdnj.edu
authors.forename: Steven E
authors.initials: SE
authors.lastname: Schutzer
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.forename: Benjamin H
authors.initials: BH
authors.lastname: Natelson
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Angel
authors.forename: Athena A
authors.initials: AA
authors.lastname: Schepmoes
authors.forename: Samuel O
authors.initials: SO
authors.lastname: Purvine
authors.forename: Kim K
authors.initials: KK
authors.lastname: Hixson
authors.forename: Mary S
authors.initials: MS
authors.lastname: Lipton
authors.forename: David G
authors.initials: DG
authors.lastname: Camp
authors.forename: Patricia K
authors.initials: PK
authors.lastname: Coyle
authors.forename: Richard D
authors.initials: RD
authors.lastname: Smith
authors.forename: Jonas
authors.initials: J
authors.lastname: Bergquist
mesh_terms: D000328:Adult; D002555:Cerebrospinal Fluid / Q000378:metabolism*; D002846:Chromatography, Affinity; D005260:Female; D006801:Humans; D008297:Male; D013058:Mass Spectrometry; D020543:Proteome; D012016:Reference Values
chemical_list: D020543:Proteome