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Originally published as JHC exPRESS on May 30, 2006.
doi:10.1369/jhc.5A6892.2006
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Journal of Histochemistry and Cytochemistry
Volume 54 (10): 1087-1094, 2006
Copyright ©The Histochemical Society, Inc.

PET-blot Analysis Contributes to BSE Strain Recognition in C57Bl/6 Mice

Stéphane Lezmi, Anna Bencsik and Thierry Baron

Agence Française de Sécurité Sanitaire des Aliments, Unité ATNC, Lyon, France

Correspondence to: Thierry Baron, Agence Française de Sécurité Sanitaire des Aliments (AFSSA), Unité ATNC 31, avenue Tony Garnier 69364, Lyon cedex 07, France. E-mail: t.baron{at}lyon.afssa.fr

Identification of the strain of agent responsible for bovine spongiform encephalopathy (BSE) can be made histologically through the analysis of both distribution and intensity of brain vacuolar lesions after BSE transmission to mouse. Another useful way to distinguish the BSE agent from other prion strains is the study of the distribution of the abnormal prion protein (PrPres). For that purpose, paraffin-embedded tissue blot (PET-blot) method was applied on brains from C57Bl/6 mice infected with cattle BSE, experimental sheep BSE, or feline spongiform encephalopathy (FSE) from a cheetah. PrPres distribution was comparable, whichever of the three BSE agent sources was considered and was distinct from the PrPres distribution in C57Bl/6 mice inoculated with a French scrapie isolate or with a mouse-adapted scrapie strain (C506M3). These data confirm a common origin of infectious agent responsible for the British and French cattle BSE. They also indicate that PET-blot method appears as a precise complementary tool in prion strain studies because it offers easy and quick assessment of the PrPres mapping. Advantages and limits of the PET-blot method are discussed and compared with other established and validated methods of strain typing. (J Histochem Cytochem 54:1087–1094, 2006)

Key Words: bovine spongiform encephalopathy • mouse • paraffin-embedded tissue blot • prion • scrapie • strains


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