title: Generation of allergen-enriched protein fractions of Hevea brasiliensis latex for in vitro and in vivo diagnosis.
abstract: BACKGROUND
  The latex of Hevea brasiliensis trees contains a complex proteome that includes a range of allergenic proteins. Current latex extracts that are used for the diagnosis of latex allergy still lack important allergens. We aimed to devise a production process for an improved reagent that would ideally contain the complete latex allergome.
  
  
  METHODS
  Latex C-serum was fractionated by ammonium sulfate precipitation, and B- and C-serum proteins were then separated by anion exchange chromatography. Proteins eluting within defined salt concentration ranges were pooled into six final fractions. Fractions were evaluated by two-dimensional electrophoresis and subsequent IgE immunoblot for their spectrum of allergens. The presence of the most important latex allergens in the fractions was checked by Western blot analyses. Each fraction was further evaluated by skin prick test (SPT).
  
  
  RESULTS
  Reproducibility of the preparation method was demonstrated with two batches of latex. Comparison of latex B- and C-serum to the six fractions showed a remarkable increase in the number of detectable allergens in the fractions. The presence of the latex allergens Hev b 1-8 and Hev b 13 in the fractions was demonstrated. In SPTs, the fractions produced wheal-and-flare reactions comparable to commercial latex extracts.
  
  
  CONCLUSIONS
  This method provides reproducible latex protein fractions of high allergen content for the diagnosis of latex allergy.
authors.affiliation: Department of Pathophysiology, Center for Physiology and Pathophysiology, Medical University of Vienna, Vienna, Austria.
authors.forename: S
authors.initials: S
authors.lastname: Wagner
authors.forename: M
authors.initials: M
authors.lastname: Bublin
authors.forename: C
authors.initials: C
authors.lastname: Hafner
authors.forename: T
authors.initials: T
authors.lastname: Kopp
authors.forename: D
authors.initials: D
authors.lastname: Allwardt
authors.forename: U
authors.initials: U
authors.lastname: Seifert
authors.forename: S A
authors.initials: SA
authors.lastname: Arif
authors.forename: O
authors.initials: O
authors.lastname: Scheiner
authors.forename: H
authors.initials: H
authors.lastname: Breiteneder
mesh_terms: D000485:Allergens / Q000276:immunology / Q000378:metabolism*; D052179:Antigens, Plant / Q000276:immunology / Q000302:isolation & purification / Q000378:metabolism*; D028482:Hevea / Q000276:immunology*; D006801:Humans; D007840:Latex / Q000276:immunology* / Q000302:isolation & purification / Q000378:metabolism*; D020315:Latex Hypersensitivity / Q000175:diagnosis* / Q000276:immunology; D010940:Plant Proteins / Q000276:immunology / Q000378:metabolism*; D012882:Skin Tests
chemical_list: D000485:Allergens; D052179:Antigens, Plant; D007840:Latex; D010940:Plant Proteins