Heterogenität von Prionprotein-Isoformen im Liquor cerebrospinalis von Patienten mit verschiedenen Typen von Prionenerkrankungen: Eine Charakterisierung unter Betrachtung zwölf monoklonaler PrP-Antikörper
Heterogeneity of prion protein isoforms in the cerebrospinal fluid of patients with different types of prion diseases: A characterization considering twelve PrP monoclonal antibodies
by Markus Schlomm
Date of Examination:2021-12-09
Date of issue:2022-01-11
Advisor:Prof. Dr. Inga Zerr
Referee:Prof. Dr. Inga Zerr
Referee:Prof. Dr. Markus Zweckstetter
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Abstract
English
The cellular prion protein is a multifunctional, evolutionarily highly conserved and ubiquitously expressed protein. It goes through a number of modifications during its post-translational processing, resulting in various glycoforms and truncated fragments. Little data exist on the expression and cleavage of the cellular prion protein in humans. In this study, we investigated the composition of prion protein isoforms in the cerebrospinal fluid of patients with various human prion diseases. The first group of patients was affected by a sporadic Creutzfeldt-Jakob disease in which different codon 129 genotypes can be found. The second group included patients with a genetic form of Creutzfeldt-Jakob disease who had an E200K mutation. The third group represented patients with fatal familial insomnia and the last group consisted of patients with Gerstmann-Sträussler-Scheinker syndrome. We investigated whether the codon 129 polymorphism in the sporadic Creutzfeldt-Jakob disease and also the type of prion disease in humans have effects on the glycosylation and processing of the cellular prion protein. Immunoblot analyzes using various monoclonal prion protein antibodies which are directed against different epitopes of the cellular prion protein showed a uniform predominance of the glycosylated prion protein isoforms compared to the unglycosylated form for all groups of patients examined. In addition, the SAF70 antibody detected a number of prion protein fragments measuring 21, 18, 13 and 12 kDa. Our further experimental findings indicated that the polymorphisms at codon 129 of the prion protein gene, the E200K mutation and the various types of human transmissible spongiform encephalopathies investigated have no measurable influence on the glycosylation and processing of the cellular prion protein in human prion diseases.
Keywords: prion