Related Experiment Videos
Apoptosis and dendritic dysfunction precede prion protein accumulation in 87V scrapie
E Jamieson1, M Jeffrey, J W Ironside
1Institute for Animal Health, Neuropathogenesis Unit, Ogston Building, West Mains Road, Edinburgh EH9 3JF, UK.
Neuroreport
|July 12, 2001
Summary
Neurodegeneration in transmissible spongiform encephalopathies begins with dendritic dysfunction and apoptosis in hippocampal neurons, preceding PrP accumulation and clinical symptoms in a mouse model.
Area of Science:
- Neuroscience
- Pathology
- Molecular Biology
Background:
- Transmissible spongiform encephalopathies (TSEs) are fatal neurodegenerative diseases.
- The precise sequence of pathological events in TSE neurodegeneration remains unclear.
- Existing models often focus on PrP accumulation as the primary driver.
Purpose of the Study:
- To investigate the early molecular and cellular events in TSE-induced neurodegeneration.
- To determine the temporal relationship between neuronal damage, apoptosis, and PrP accumulation in a specific brain region.
- To elucidate the initial pathological trigger in hippocampal neurodegeneration during scrapie infection.
Main Methods:
- Utilized a murine scrapie model with CA2-restricted hippocampal neurodegeneration.
- Examined pyramidal neuron damage and cell death mechanisms.
- Assessed the timing of apoptosis relative to PrP deposition and clinical signs.
Main Results:
- Pyramidal neuron damage and apoptotic cell death were observed early in the incubation period.
- Neuronal apoptosis occurred before detectable PrP accumulation in CA2.
- These pathological changes preceded the onset of clinical symptoms.
Conclusions:
- The initial event in hippocampal neurodegeneration in this model is likely dendritic dysfunction and apoptosis.
- PrP accumulation may not be the primary trigger for early neuronal damage in TSEs.
- Apoptotic pathways are activated early, independent of significant PrP buildup.