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Amphotericin B delays both scrapie agent replication and PrP-res accumulation early in infection
D McKenzie1, J Kaczkowski, R Marsh
1Department of Animal Health and Biomedical Sciences, University of Wisconsin-Madison 53706.
Abstract:
Amphotericin B delays the onset of clinical symptoms in hamsters infected with scrapie agent strain 263K. Here we show that accumulation of a scrapie-specific isoform of the prion protein (PrP-res) and agent replication were delayed early in amphotericin B-treated animals. By 8 weeks postinfection, only untreated animals exhibited clinical symptoms of scrapie infection whereas PrP-res levels and titers were similar in treated and untreated animals. This suggests that although PrP-res accumulation and agent replication are linked, they are not the sole factors required for the onset of clinical disease.
Insights
Amphotericin B delays scrapie symptoms in hamsters by inhibiting prion protein (PrP-res) accumulation and agent replication. However, disease onset is not solely dependent on these factors, as levels normalized later in treatment.
Area of Science:
- Neuroscience
- Infectious Diseases
- Biochemistry
Background:
- Scrapie is a fatal neurodegenerative disease caused by prions.
- Prion diseases are characterized by the accumulation of abnormal prion protein (PrP-res).
- Amphotericin B is an antifungal agent with potential antiviral properties.
Purpose of the Study:
- To investigate the effect of Amphotericin B on scrapie agent strain 263K in a hamster model.
- To determine if Amphotericin B influences the accumulation of PrP-res and agent replication.
- To assess the relationship between PrP-res levels, agent replication, and clinical disease onset.
Main Methods:
- Hamsters were infected with scrapie agent strain 263K.
- Animals were treated with Amphotericin B or a placebo.
- PrP-res levels and agent titers were measured at various time points post-infection.
Main Results:
- Amphotericin B treatment delayed the onset of clinical symptoms.
- Early accumulation of PrP-res and agent replication were reduced in treated animals.
- By 8 weeks post-infection, PrP-res levels and titers were similar in treated and untreated groups, despite symptom differences.
Conclusions:
- Amphotericin B can delay scrapie progression in hamsters.
- PrP-res accumulation and agent replication are linked to disease but do not solely determine clinical onset.
- Further research is needed to understand the mechanisms underlying Amphotericin B's therapeutic effect.