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Microglia and prion disease: a review
1Department of Neuropathology, University of Göttingen, Germany.
Abstract:
Prion diseases are characterized by the accumulation of PrPSc, an altered isoform of a normal cellular protein, PrPc. The prion hypothesis holds that the process of conformational change from PrPc to PrPSc under the influence of PrPSc constitutes the basic infectious mechanism in prion diseases. It is still unknown whether pathological changes in these diseases, which include spongiform degeneration, nerve cell loss and gliosis, are the result of neurotoxicity of PrPSc, loss of function of PrPc or some other mechanism. Recent in vitro findings using a synthetic peptide of human PrPc implicate microglia as a mediator of pathological changes. The mechanism of the toxicity of this peptide involves activation of microglia oxidative stress, and direct interactions with PrPc-synthesizing neurones that reduce their ability to cope with oxidative stress. Microglia thus seem to emerge as a mediator of neuronal degeneration and cell death in prion diseases.
Insights
Microglia may mediate neuronal damage in prion diseases. Research suggests activated microglia and oxidative stress contribute to neurodegeneration by impairing neurons
Area of Science:
- Neuroscience
- Pathology
- Cell Biology
Background:
- Prion diseases involve abnormal prion protein (PrPSc) accumulation.
- The exact cause of neurodegeneration in prion diseases remains unclear.
- Prion protein (PrPc) is a normal cellular protein.
Purpose of the Study:
- To investigate the role of microglia in prion disease pathology.
- To explore the mechanism of neurodegeneration induced by PrPc peptides.
Main Methods:
- In vitro studies using synthetic human PrPc peptides.
- Analysis of microglia activation and oxidative stress.
- Assessment of neuronal response to oxidative stress.
Main Results:
- Synthetic PrPc peptides activate microglia, inducing oxidative stress.
- Activated microglia impair neurons' ability to handle oxidative stress.
- Microglia appear to mediate neuronal degeneration.
Conclusions:
- Microglia are implicated as key mediators of neuronal cell death in prion diseases.
- Oxidative stress induced by microglia plays a significant role in neurodegeneration.