title: Preliminary study of an increase of a plasma apolipoprotein E variant associated with peripheral nerve damage. A finding in patients with chronic spinal pain.
abstract: METHODS
  This two-dimensional gel electrophoretic study analyzed the plasma of six groups of patients to determine the association of an elevated apolipoprotein E variant with peripheral nerve damage (PND).
  
  
  OBJECTIVE
  To find a statistically significant plasma protein alteration in patients with PND including chronic spinal pain.
  
  
  BACKGROUND
  A twofold to fivefold increase in human plasma apolipoprotein E may be a physiologic response to PND as a 250-fold local increase in apolipoprotein E was reported in experimental PND studies in mammals.
  
  
  METHODS
  A total of 36 patients with chronic lumbar pain, 28 normal control subjects, and 33 patients with other conditions were studied. Venipuncture was performed and plasma was studied using the technique of two-dimensional gel electrophoresis. Chi-square analysis was used to evaluate results.
  
  
  RESULTS
  A statistically significant (P < 0.005) elevation of the plasma apolipoprotein E variant was found in patients with chronic lumbar pain. It also was elevated in patients with chronic cervical pain, extraspinal pain with PND, and chronic inflammatory diseases; but not in extraspinal pain without PND, or asymptomatic biomechanically deficient lumbar spines.
  
  
  CONCLUSIONS
  This quantitative protein alteration, although not specific for PND, may prove useful in the treatment of conditions with this disorder, including chronic spinal pain.
authors.affiliation: Orthopaedic Research Center, St. Luke's Episcopal Hospital, Houston, Texas, USA.
authors.forename: B M
authors.initials: BM
authors.lastname: Cameron
authors.forename: D M
authors.initials: DM
authors.lastname: VanderPutten
authors.forename: C R
authors.initials: CR
authors.lastname: Merril
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001057:Apolipoproteins E / Q000097:blood*; D015180:Electrophoresis, Gel, Two-Dimensional; D005260:Female; D006801:Humans; D007249:Inflammation / Q000097:blood; D017116:Low Back Pain / Q000097:blood* / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D010523:Peripheral Nervous System Diseases / Q000097:blood*; D013128:Spinal Osteophytosis / Q000097:blood
chemical_list: D001057:Apolipoproteins E