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Proteoglycans and amyloid fibrillogenesis
1Department of Pathology, Queen's University, Kingston General Hospital, Ontario, Canada.
Abstract:
A brief discussion of the general structure of proteoglycans is followed by a description of the diverse nature of amyloids. Using the murine form of inflammation-associated (AA) amyloid, we have examined the temporal and anatomical relationship between the heparan sulfate proteoglycan, its mRNA and AA amyloid deposition in vivo. The in vitro effect of heparan sulfate on the secondary structure of amyloid precursors, and on amyloid peptides, suggests that this interaction is important in amyloidogenesis. The relationship of these two components likely reflects a more general process taking place between basement membrane proteins (which may be synthesized by a variety of cell types within and outside the CNS) and amyloid precursors. A general definition of in vivo amyloid deposits emerges from these considerations as do concepts for interfering with amyloidogenesis. Preliminary results showing the effect of small molecule aliphatic sulfonates and sulfates on in vitro amyloid beta-protein fibrillogenesis and AA amyloidogenesis in vivo supports the general process presented and suggests therapeutic strategies for treating amyloid-based diseases.
Insights
Heparan sulfate proteoglycans interact with amyloid precursors, influencing amyloid deposition. This interaction suggests new therapeutic strategies for amyloid-based diseases by targeting small molecules.
Area of Science:
- Biochemistry
- Molecular Biology
- Pathology
Background:
- Amyloids are diverse protein aggregates implicated in various diseases.
- Proteoglycans, particularly heparan sulfate proteoglycans, play roles in cellular processes.
- The relationship between proteoglycans and amyloid formation in vivo is not fully understood.
Purpose of the Study:
- To investigate the temporal and anatomical relationship between heparan sulfate proteoglycans and amyloid deposition.
- To explore the in vitro effect of heparan sulfate on amyloid precursor structure.
- To propose general concepts for interfering with amyloidogenesis.
Main Methods:
- Utilized murine inflammation-associated (AA) amyloid model.
- Examined in vivo temporal and anatomical correlations.
- Performed in vitro studies on the effect of heparan sulfate on amyloid precursors and peptides.
- Assessed the impact of small molecule aliphatic sulfonates and sulfates on amyloid fibrillogenesis.
Main Results:
- Demonstrated a relationship between heparan sulfate proteoglycan, its mRNA, and AA amyloid deposition in vivo.
- Showed that heparan sulfate affects the secondary structure of amyloid precursors in vitro, suggesting a role in amyloidogenesis.
- Preliminary results indicate that small molecules can inhibit amyloid beta-protein fibrillogenesis and AA amyloidogenesis.
Conclusions:
- The interaction between basement membrane proteins and amyloid precursors is a general process in vivo amyloid deposition.
- This interaction provides a basis for developing therapeutic strategies against amyloid-based diseases.
- Small molecule aliphatic sulfonates and sulfates show promise as therapeutic agents.