title: Comparison of allergenic components and biopotency in whole body extracts of wild and laboratory reared American cockroaches, Periplaneta americana.
abstract: OBJECTIVE
  Most allergen extracts/vaccines used today in clinical practice are derived from natural allergen sources. Therefore, their allergic components may vary as these are prone to natural variation. This study aims to compare the allergenic components and biological potency of crude extracts from wild and laboratory reared American cockroaches.
  
  
  METHODS
  Crude extracts of male and female of wild and laboratory reared American CR, were prepared by the same method. Their allergenic components were evaluated by in vitro assays such as protein contents, protein profiles, quantification of major allergens (Per a 1 and Per a 9) and IgE inhibition ELISA assay.
  
  
  CONCLUSIONS
  There was no statistically significant difference between the protein contents and the concentrations of Per a 1 in the crude extracts from both groups. However, the Per a 9 levels in extracts of wild CR were significantly higher than those from the extracts of laboratory reared CR. The protein patterns of the extracts of laboratory reared CR exhibited more consistency in the number of bands with higher intensity than those of wild CR. Pooled extracts of laboratory reared CR could inhibit IgE binding to that of wild CR up to 78%. The endotoxin content of extracts of laboratory reared CR were ten times less than those of the the wild CR. We have successfully determined the allergenic potency of the extracts of laboratory reared CR versus those of the wild CRs by in vitro assays. Further studies should be performed to determine the biological potency of CR extracts by in vivo assays for clinical application.
  
  
  CONCLUSIONS
  Our finding indicates that the laboratory reared CR would be the better source of material in vaccine production than the wild CR.
authors.affiliation: Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand. anchalee.tun@mahidol.ac.th
authors.forename: Anchalee
authors.initials: A
authors.lastname: Tungtrongchitr
authors.forename: Nitat
authors.initials: N
authors.lastname: Sookrung
authors.forename: Wanpen
authors.initials: W
authors.lastname: Chaicumpa
authors.forename: Nitaya
authors.initials: N
authors.lastname: Indrawattana
authors.forename: Thitiporn
authors.initials: T
authors.lastname: Meechan
authors.forename: Usavadee
authors.initials: U
authors.lastname: Thavara
authors.forename: Nualanong
authors.initials: N
authors.lastname: Visitsunthorn
authors.forename: Chaweewan
authors.initials: C
authors.lastname: Bunnag
mesh_terms: D000328:Adult; D000485:Allergens / Q000032:analysis* / Q000276:immunology*; D000818:Animals; D000830:Animals, Laboratory; D000835:Animals, Wild; D001122:Arginine Kinase / Q000032:analysis / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D006801:Humans; D006967:Hypersensitivity / Q000097:blood / Q000209:etiology / Q000276:immunology; D007073:Immunoglobulin E / Q000276:immunology; D008297:Male; D010526:Periplaneta / Q000737:chemistry* / Q000276:immunology*
chemical_list: D000485:Allergens; C091463:allergen Per a I; D007073:Immunoglobulin E; D001122:Arginine Kinase; C553356:Per a 9 allergen, Periplaneta americana