Related Experiment Videos
The use of monosodium glutamate in identifying neuronal populations in mice infected with scrapie
J D Foster1, J R Scott, H Fraser
1AFRC and MRC Neuropathogenesis Unit, Edinburgh.
Abstract:
The excitatory amino-acid, monosodium glutamate, which causes degeneration in the retinal ganglion cells in neonatal mice, was used to investigate the transport of scrapie within optic nerve axons. In treated mice, there was prolongation of the incubation period following intraocular infection with the ME7 strain of scrapie, and a decrease in the severity of retinopathy after intracerebral infection with the 79A strain. These data confirm that scrapie infection spreads along neural pathways, and demonstrate the potential use of selective neurotoxins to study pathogenesis.
Insights
Monosodium glutamate, a neurotoxin, was used to study scrapie transport in optic nerve axons. This research confirms scrapie spreads via neural pathways and highlights neurotoxins
Area of Science:
- Neuroscience
- Pathology
- Ophthalmology
Background:
- Scrapie is a transmissible spongiform encephalopathy.
- Retinal ganglion cells are vulnerable to excitotoxicity.
- Neural pathways are implicated in prion disease spread.
Purpose of the Study:
- To investigate the transport of scrapie within optic nerve axons.
- To explore the utility of monosodium glutamate (MSG) as a neurotoxin in studying neurodegenerative disease pathogenesis.
- To analyze the impact of MSG on scrapie incubation periods and disease severity.
Main Methods:
- Neonatal mice were treated with monosodium glutamate (MSG).
- Intraocular and intracerebral infections with specific scrapie strains (ME7 and 79A) were performed.
- Incubation periods and retinopathy severity were assessed in treated and control groups.
Main Results:
- MSG treatment led to a prolonged incubation period following intraocular scrapie infection (ME7 strain).
- MSG treatment decreased the severity of retinopathy after intracerebral scrapie infection (79A strain).
- These findings suggest that scrapie utilizes optic nerve axons for neural spread.
Conclusions:
- Scrapie infection disseminates along neural pathways.
- Selective neurotoxins, like MSG, can be valuable tools for elucidating the pathogenesis of neurodegenerative diseases.
- The study provides insights into the mechanisms of prion neuroinvasion.