This is a competing renewal of Merit Grant AR02594, which originally focused on the structure of immunoglubulins and their role in systemic amyloidosis. Although these investigations elucidated important structural data, the hypervariability of immunoglobulins and the lack of reliable animal models lead us to extend our studies to cerebral amyloidoses, and in particular the prion related disorders for which there are better model system. However, the central question we are addressing remains the same: What are the factors producing disease associated, abnormal protein conformation. The amyloidoses and several degenerative conditions are disorders of protein conformation, whereby a normal protein is structurally altered and is associated with the disease state. The prion diseases are the best defined human conformational diseases. Central to the etiology of prion disorders is the conversion of normal prion protein, PrP/C, into its infectious and pathogenic form, PrP/Sc. Current data indicate that PrP/c and PrP/Sc differ only in their conformation, with PrP/Sc have a greater beta-sheet content. However, identification of numerous """"""""strains"""""""" of prions suggest the existence of multiple PrP/Sc conformations; alternatively, undefined co-factors may have a role in infectivity and strain specificity. We have postulated and demonstrated previously that molecular chaperones can bind and alter protein conformation leading to amyloidogenesis.
In specific aim 1, we propose to identify PrP/Sc binding proteins and study their role in infectivity. and their strain-specific conformation properties. The existence of multiple conformations will be assessed by circular dichroism, FT-IR and proteinase K resistance of the isolated strains. The effect of PrP/Sc binding proteins on PrP/c conformation in vitro will be correlated with infectivity in vivo.
In specific aim 2 we propose to construct synthetic peptides or mini chaperones capable of reversing pathologic protein conformation in order to modify PrP/Sc species in vitro and determine the effect of in vivo infectivity. Purified PrP/Sc, pretreated with mini-chaperone peptides specifically designed to bind and alter prior conformation will be assessed for alterations in infectivity and strain behavior. We shall test whether similar peptides can be used for in vivo imaging of PrP/Sc, utilizing [I/125]-labeling followed by autoradiography pr [19F]-labeling in conjunction with magnetic resonance spectroscopy. Our long-term goals are to define the structural features critical for the formation of PrP/Sc, which will have implications for the design rationale of effective pharmacological and diagnostic tools, as well as deepen our understanding of the basic mechanism(s) underlying conformational diseases.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Research Project (R01)
Project #
2R01AR002594-41
Application #
2861309
Study Section
Special Emphasis Panel (ZRG1-BDCN-4 (01))
Program Officer
Serrate-Sztein, Susana
Project Start
1978-09-01
Project End
2004-03-31
Budget Start
1999-04-05
Budget End
2000-03-31
Support Year
41
Fiscal Year
1999
Total Cost
Indirect Cost
Name
New York University
Department
Pathology
Type
Schools of Medicine
DUNS #
City
New York
State
NY
Country
United States
Zip Code
10016
Sigurdsson, Einar M (2006) Immunotherapy for conformational diseases. Curr Pharm Des 12:2569-85
Goni, Fernando; Sigurdsson, Einar M (2005) New directions towards safer and effective vaccines for Alzheimer's disease. Curr Opin Mol Ther 7:17-23
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Sigurdsson, Einar M; Knudsen, Elin; Asuni, Ayodeji et al. (2004) An attenuated immune response is sufficient to enhance cognition in an Alzheimer's disease mouse model immunized with amyloid-beta derivatives. J Neurosci 24:6277-82
Berasain, Patricia; Carmona, Carlos; Frangione, Blas et al. (2003) Specific cleavage sites on human IgG subclasses by cruzipain, the major cysteine proteinase from Trypanosoma cruzi. Mol Biochem Parasitol 130:23-9
Sigurdsson, Einar M; Brown, David R; Alim, Muhammad A et al. (2003) Copper chelation delays the onset of prion disease. J Biol Chem 278:46199-202
Sigurdsson, Einar M; Brown, David R; Daniels, Maki et al. (2002) Immunization delays the onset of prion disease in mice. Am J Pathol 161:13-7
Sigurdsson, E M; Scholtzova, H; Mehta, P D et al. (2001) Immunization with a nontoxic/nonfibrillar amyloid-beta homologous peptide reduces Alzheimer's disease-associated pathology in transgenic mice. Am J Pathol 159:439-47
Aucouturier, P; Geissmann, F; Damotte, D et al. (2001) Infected splenic dendritic cells are sufficient for prion transmission to the CNS in mouse scrapie. J Clin Invest 108:703-8
Vidal, R; Calero, M; Revesz, T et al. (2001) Sequence, genomic structure and tissue expression of Human BRI3, a member of the BRI gene family. Gene 266:95-102

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