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Published on: January 8, 2015
Amyloid associated proteins in Alzheimer's and prion disease
R Veerhuis1, R S Boshuizen, A Familian
1Institute for Clinical and Experimental Neurosciences-VU, Departments of Psychiatry Vrije Universiteit University Medical Center, 1007 MB Amsterdam, The Netherlands. r.veerhuis@vumc.nl
Abstract:
Clustering of activated microglia in Abeta deposits is related to accumulation of amyloid associated factors and precedes the neurodegenerative changes in AD. Microglia-derived pro-inflammatory cytokines are suggested to be the driving force in AD pathology. Inflammation-related proteins, including complement factors, acute-phase proteins, pro-inflammatory cytokines, that normally are locally produced at low levels, are increasingly synthesized in Alzheimer's disease (AD) brain. Similar to AD, in prion diseases (Creutzfeldt-Jakob disease, Gerstmann-Sträussler-Scheinker disease and experimentally scrapie infected mouse brain) amyloid associated factors and activated glial cells accumulate in amyloid deposits of conformational changed prion protein (PrPres). Biological properties of Abeta and prion (PrP) peptides, including their potential to activate microglia, relate to Abeta and PrP peptide fibrillogenic abilities that are influenced by certain amyloid associated factors. However, since small oligomers of amyloid forming peptides are more toxic to neurons than large fibrils, certain amyloid associated factors that enhance fibril formation, may sequester the potentially harmful Abeta and PrP peptides from the neuronal microenvironment. In this review the positive and negative actions of amyloid associated factors on amyloid peptide fibril formation and on the fibrillation state related activation of microglia will be discussed. Insight in these mechanisms will enable the design of specific therapies to prevent neurodegenerative diseases in which amyloid accumulation and glial activation are prominent early features.
Insights
Amyloid-associated factors influence microglial activation in neurodegenerative diseases like Alzheimer's. Understanding these factors is key to developing therapies that target amyloid accumulation and glial activation.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Microglial activation and inflammation are hallmarks of Alzheimer's disease (AD) and prion diseases.
- Amyloid deposits in AD and prion diseases contain activated glial cells and amyloid-associated factors.
- Pro-inflammatory cytokines from microglia are implicated as drivers of AD pathology.
Purpose of the Study:
- To review the dual role of amyloid-associated factors in amyloid peptide fibril formation.
- To discuss the impact of these factors on microglia activation in the context of neurodegeneration.
- To highlight the potential for therapeutic strategies targeting amyloid and glial activation.
Main Methods:
- Literature review of studies on amyloid-associated factors, microglial activation, and neurodegenerative diseases.
- Analysis of the relationship between amyloid peptide fibril formation and glial cell responses.
- Synthesis of information on the mechanisms underlying amyloid-associated factor influence.
Main Results:
- Amyloid-associated factors modulate the fibrillogenic properties of amyloid peptides (Abeta and PrP).
- These factors can either promote or inhibit amyloid formation, influencing its toxicity.
- Factors enhancing fibril formation may sequester toxic oligomers, potentially protecting neurons.
Conclusions:
- Amyloid-associated factors play a complex role in neurodegenerative diseases by influencing both amyloid aggregation and neuroinflammation.
- Targeting these factors offers a promising therapeutic avenue for diseases characterized by amyloid accumulation and glial activation.
- Further research into these mechanisms can guide the development of novel treatments for AD and related disorders.
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