title: Urine proteins identified by two-dimensional differential gel electrophoresis facilitate the differential diagnoses of scrapie.
abstract: The difficulty in developing a diagnostic assay for Creutzfeldt - Jakob disease (CJD) and other transmissible spongiform encephalopathies (TSEs) stems in part from the fact that the infectious agent is an aberrantly folded form of an endogenous cellular protein. This precludes the use of the powerful gene based technologies currently applied to the direct detection of other infectious agents. To circumvent this problem our research objective has been to identify a set of proteins exhibiting characteristic differential abundance in response to TSE infection. The objective of the present study was to assess the disease specificity of differentially abundant urine proteins able to identify scrapie infected mice. Two-dimensional differential gel electrophoresis was used to analyze longitudinal collections of urine samples from both prion-infected mice and a transgenic mouse model of Alzheimer's disease. The introduction of fluorescent dyes, that allow multiple samples to be co-resolved and visualized on one two dimensional gel, have increased the accuracy of this methodology for the discovery of robust protein biomarkers for disease. The accuracy of a small panel of differentially abundant proteins to correctly classify an independent naïve sample set was determined. The results demonstrated that at the time of clinical presentation the differential abundance of urine proteins were capable of identifying the prion infected mice with 87% sensitivity and 93% specificity. The identity of the diagnostic differentially abundant proteins was investigated by mass spectrometry.
authors.affiliation: Prion Laboratory Services Section, Public Health Agency of Canada, Winnipeg, Manitoba, Canada.
authors.forename: Lise
authors.initials: L
authors.lastname: Lamoureux
authors.forename: Sharon L R
authors.initials: SL
authors.lastname: Simon
authors.forename: Margot
authors.initials: M
authors.lastname: Plews
authors.forename: Viola
authors.initials: V
authors.lastname: Ruddat
authors.forename: Simone
authors.initials: S
authors.lastname: Brunet
authors.forename: Catherine
authors.initials: C
authors.lastname: Graham
authors.forename: Stefanie
authors.initials: S
authors.lastname: Czub
authors.forename: J David
authors.initials: JD
authors.lastname: Knox
mesh_terms: D000465:Algorithms; D000544:Alzheimer Disease / Q000652:urine; D000818:Animals; D015415:Biomarkers / Q000652:urine; D002232:Carbocyanines / Q000378:metabolism; D003937:Diagnosis, Differential; D004195:Disease Models, Animal; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods*; D005260:Female; D013058:Mass Spectrometry; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D025341:Principal Component Analysis; D011506:Proteins / Q000378:metabolism*; D020543:Proteome / Q000737:chemistry; D015203:Reproducibility of Results; D012608:Scrapie / Q000175:diagnosis* / Q000652:urine*
chemical_list: D015415:Biomarkers; D002232:Carbocyanines; D011506:Proteins; D020543:Proteome; C011203:cyanine dye 2