title: Comparison of immunoblotting and ELISA for detection of anti-ganglioside antibodies in children with Guillain-Barre syndrome.
abstract: BACKGROUND
  Anti-ganglioside antibody assays are widely used for diagnosis of autoimmune peripheral neuropathies.
  
  
  OBJECTIVE
  This study aimed to determine serum levels of anti-ganglioside antibodies in children with Guillain-Barre syndrome by immunoblotting technique and compare the results with those obtained by ELISA method.
  
  
  METHODS
  In this investigation, 50 children with Guillain-Barre syndrome (GBS) who were admitted from July 2006 to July 2008, to Tabriz Children's Hospital in the northwest of Iran were studied. 30 children admitted for various other reasons than GBS were randomly selected as a control group. The levels of anti-ganglioside antibodies in serum were measured by ELISA and immunoblotting methods using commercial kits.
  
  
  RESULTS
  Anti-ganglioside antibodies (IgG) were detected in 16 (32%) GBS patients and in 1 (3.3%) control using ELISA assay. However, by employing immunoblotting technique, antibodies against seven gangliosides were found positive in 28 (56%) of GBS patients and none in the control group. The sensitivities of immunoblotting and ELISA methods were 56% and 32% and their specificities were 100% and 97%, respectively (p<0.001).
  
  
  CONCLUSIONS
  According to the clinical criteria of GBS, the specificity and sensitivity of immunoblotting was better than those of ELISA. It is important to notice that the immunoblotting method is able to measure the seven types of antibodies (GM1, GM2, GM3, GD1a, GD1b, GT1b, and GQ1b) simultaneously and it is an easy, routine method with a lower cost.
authors.affiliation: Department of Immunology, Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. bonyadir@tbzmed.ac.ir
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Bonyadi
authors.forename: Mohammad
authors.initials: M
authors.lastname: Barzegar
authors.forename: Reza
authors.initials: R
authors.lastname: Badalzadeh
authors.forename: Mazyar
authors.initials: M
authors.lastname: Hashemilar
mesh_terms: D001323:Autoantibodies / Q000097:blood / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D003362:Cost-Benefit Analysis; D004797:Enzyme-Linked Immunosorbent Assay / Q000191:economics / Q000379:methods*; D005260:Female; D005732:Gangliosides / Q000276:immunology*; D020275:Guillain-Barre Syndrome / Q000097:blood / Q000175:diagnosis* / Q000276:immunology*; D006801:Humans; D015151:Immunoblotting / Q000191:economics / Q000379:methods*; D007132:Immunoglobulin Isotypes; D007223:Infant; D008297:Male; D012680:Sensitivity and Specificity
chemical_list: D001323:Autoantibodies; D005732:Gangliosides; D007132:Immunoglobulin Isotypes