NR AVHL
AU Konold,T.; Lee,Y.H.; Stack,M.J.; Horrocks,C.; Green,R.B.; Chaplin,M.J.; Simmons,M.M.; Hawkins,S.A.C.; Lockey,R.; Spiropoulos,J.; Wilesmith,J.W.; Wells,G.A.H.
TI Different prion disease phenotypes result from inoculation of cattle with two temporally separated sources of sheep scrapie from Great Britain
QU BMC Veterinary Research 2006 Oct 17; 2(1): 31
PT journal article; research support, non-u.s. gov't
AB BACKGROUND: Given the theoretical proposal that bovine spongiform encephalopathy (BSE) could have originated from sheep scrapie, this study investigated the pathogenicity for cattle, by intracerebral (i.c.) inoculation, of two pools of scrapie agents sourced in Great Britain before and during the BSE epidemic. Two groups of ten cattle were each inoculated with pools of brain material from sheep scrapie cases collected prior to 1975 and after 1990. Control groups comprised five cattle inoculated with sheep brain free from scrapie, five cattle inoculated with saline, and for comparison with BSE, naturally infected cattle and cattle i.c. inoculated with BSE brainstem homogenate from a parallel study. Phenotypic characterisation of the disease forms transmitted to cattle was conducted by morphological, immunohistochemical, biochemical and biological methods. RESULTS: Disease occurred in 16 cattle, nine inoculated with the pre-1975 inoculum and seven inoculated with the post-1990 inoculum, with four cattle still alive at 83 months post challenge (as at June 2006). The different inocula produced predominantly two different disease phenotypes as determined by histopathological, immunohistochemical and Western immunoblotting methods and biological characterisation on transmission to mice, neither of which was identical to BSE. Whilst the disease presentation was uniform in all scrapie-affected cattle of the pre-1975 group, the post-1990 inoculum produced a more variable disease, with two animals sharing immunohistochemical and molecular profile characteristics with animals in the pre-1975 group. CONCLUSION: The study has demonstrated that cattle inoculated with different pooled scrapie sources can develop different prion disease phenotypes, which were not consistent with the phenotype of BSE of cattle and whose isolates did not have the strain typing characteristics of the BSE agent on transmission to mice.
IN Die Autoren inokulierten jeweils 10 Rinder intrazerebral mit Hirnhomogenaten aus jeweils mehreren Hirnen von Schafen, die entweder vor 1975 oder nach 1990 an Scrapie erkrankt waren. Innerhalb des Beobachtungszeitraumes von 83 Monaten ließ das vor 1975 gesammelte Inokulum 9 von 10 Rindern erkranken, das nach 1995 gesammelte nur 7 von 10. Bei keinem der erkrankten Rinder entsprachen das histopathologische, das immunhistochemische und das Bandenmuster im Western blot sowie die biologischen Parameter bei der Stammcharakterisierung in Mäusen den Mustern nach Inokulationen mit BSE-infektiösem Hirnhomogenat.
MH Animals; Brain/pathology; Cattle; Cattle Diseases/diagnosis/*pathology/*transmission; Cluster Analysis; Encephalopathy, Bovine Spongiform/*diagnosis/metabolism/pathology; Great Britain/epidemiology; Mice; Phenotype; PrPsc Proteins/classification/*isolation & purification/*pathogenicity; Prion Diseases/diagnosis/pathology/transmission/*veterinary; Sheep; Sheep Diseases/*transmission; Time Factors
AD Timm Konold (t.konold@vla.defra.gsi.gov.uk), Michael J. Stack (m.j.stack@vla.defra.gsi.gov.uk), Claire Horrocks (claire.horrocks@gmail.com), Robert B. Green (r.b.green@vla.defra.gsi.gov.uk), Melanie Chaplin (m.j.chaplin@vla.defra.gsi.gov.uk), Marion M. Simmons (m.m.simmons@vla.defra.gsi.gov.uk), Steve A.C. Hawkins (s.a.c.hawkins@vla.defra.gsi.gov.uk), Richard Lockey (r.lockey@vla.defra.gsi.gov.uk), John Spiropoulos (j.spiropoulos@vla.defra.gsi.gov.uk), Gerald A.H. Wells (g.a.h.wells@vla.defra.gsi.gov.uk), Veterinary Laboratories Agency Weybridge, New Haw, Addlestone, UK; Yoon Hee Lee (leeyh@nvrqs.go.kr), National Veterinary Research and Quarantine Service, Anyang, Republic of Korea; John W. Wilesmith (john.wilesmith@DEFRA.GSI.GOV.UK), Department for Environment, Food and Rural Affairs, 1A Page Street, London, UK
SP englisch
PO England