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Bioassays and Inactivation of Prions
Kurt Giles1,2, Amanda L Woerman1,2, David B Berry1
1Institute for Neurodegenerative Diseases, Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, California 94158.
Abstract:
The experimental study of prions requires a model for their propagation. However, because prions lack nucleic acids, the simple techniques used to replicate bacteria and viruses are not applicable. For much of the history of prion research, time-consuming bioassays in animals were the only option for measuring infectivity. Although cell models and other in vitro tools for the propagation of prions have been developed, they all suffer limitations, and animal bioassays remain the gold standard for measuring infectivity. A wealth of recent data argues that both β-amyloid (Aβ) and tau proteins form prions that cause Alzheimer's disease, and α-synuclein forms prions that cause multiple system atrophy and Parkinson's disease. Cell and animal models that recapitulate some of the key features of cell-to-cell spreading and distinct strains of prions can now be measured.
Insights
Prion diseases, like Alzheimer's and Parkinson's, are studied using animal models because prions lack nucleic acids. New models show promise for measuring prion infectivity and strain characteristics.
Area of Science:
- Neuroscience
- Biochemistry
- Infectious Diseases
Background:
- Prion propagation research traditionally relied on animal bioassays due to the absence of nucleic acids in prions, making standard replication methods ineffective.
- Existing in vitro and cell-based prion propagation models have limitations, leaving animal bioassays as the benchmark for measuring prion infectivity.
- Emerging evidence suggests that protein aggregates like beta-amyloid (Aβ), tau, and alpha-synuclein function as prions, implicated in Alzheimer's disease, Parkinson's disease, and multiple system atrophy.
Purpose of the Study:
- To review the challenges and advancements in prion propagation modeling.
- To highlight the role of protein misfolding in neurodegenerative diseases and their prion-like behavior.
- To discuss the development of improved models for studying prion diseases.
Main Methods:
- Review of existing literature on prion propagation and modeling techniques.
- Analysis of recent data linking specific protein aggregates to prion diseases.
- Discussion of cell and animal models capable of recapitulating prion strain diversity and cell-to-cell spread.
Main Results:
- Animal bioassays remain the gold standard for measuring prion infectivity despite limitations.
- Beta-amyloid and tau proteins are increasingly recognized as prions causing Alzheimer's disease.
- Alpha-synuclein is identified as a prion causing Parkinson's disease and multiple system atrophy.
- Newer cell and animal models demonstrate key prion features like strain variation and cell-to-cell transmission.
Conclusions:
- Prion research has evolved beyond traditional methods, with significant progress in understanding protein-based prion diseases.
- The development of advanced models facilitates the study of prion diseases, including Alzheimer's and Parkinson's.
- These models offer new avenues for measuring prion infectivity and characterizing distinct prion strains.
