title: Detection of Cry1Ab protein in gastrointestinal contents but not visceral organs of genetically modified Bt11-fed calves.
abstract: The fate of insecticidal Cry1Ab protein was examined in the gastrointestinal (GI) contents and visceral organs of calves fed insect-resistant genetically modified maize Bt11. Twelve cross-breed (Japanese black x Holstein) calves were fed either Bt11 or non-genetically modified isoline maize for 90 d. Peripheral blood, rumen juice and feces were collected fortnightly, and GI contents and visceral organs were collected at slaughter at the end of the experiment. Samples were checked for Cry1Ab protein by immunological methods, and visceral organs were examined pathologically. Trace amounts of Cry1Ab protein were detected in the GI contents but not in the liver, spleen, kidney, muscle or mesenteric lymph nodes. No lesions were observed pathologically. Cry1Ab protein in the feces was degraded quickly at atmospheric temperature. These results suggested that only a trace amount of Cry1Ab protein survived passage through the GI tract but was not transferred to liver, spleen, kidney, lymph nodes or muscles.
authors.affiliation: Department of Safety Research, National Institute of Animal Health, Tsukuba, 305-0856, Japan.
authors.forename: E H
authors.initials: EH
authors.lastname: Chowdhury
authors.forename: N
authors.initials: N
authors.lastname: Shimada
authors.forename: H
authors.initials: H
authors.lastname: Murata
authors.forename: O
authors.initials: O
authors.lastname: Mikami
authors.forename: P
authors.initials: P
authors.lastname: Sultana
authors.forename: S
authors.initials: S
authors.lastname: Miyazaki
authors.forename: M
authors.initials: M
authors.lastname: Yoshioka
authors.forename: N
authors.initials: N
authors.lastname: Yamanaka
authors.forename: N
authors.initials: N
authors.lastname: Hirai
authors.forename: Y
authors.initials: Y
authors.lastname: Nakajima
mesh_terms: D000818:Animals; D001413:Bacillus thuringiensis / Q000472:pathogenicity*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000378:metabolism / Q000493:pharmacokinetics*; D001427:Bacterial Toxins; D002417:Cattle; D004064:Digestive System / Q000737:chemistry*; D004731:Endotoxins / Q000378:metabolism / Q000493:pharmacokinetics*; D004797:Enzyme-Linked Immunosorbent Assay; D005243:Feces / Q000737:chemistry; D006460:Hemolysin Proteins; D007306:Insecticides / Q000378:metabolism / Q000493:pharmacokinetics*; D010572:Pest Control, Biological; D030821:Plants, Genetically Modified; D014018:Tissue Distribution; D003313:Zea mays / Q000235:genetics*
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004731:Endotoxins; D006460:Hemolysin Proteins; D007306:Insecticides; C030956:insecticidal crystal protein, Bacillus Thuringiensis