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Evidence for induction of localized amyloid deposits and neuritic plaques by an infectious agent
Abstract:
Mice inoculated intracerebrally with mouse brain homogenate infected with a particular strain of scrapie agent developed amyloid and neuritic plaques and amyloid tubercles along the injection track, solid wall-like infiltrations at the injection site, or both. Our observations implicate an infections agent in the localized formation of the amyloid and the neuritic plaque--the leading pathological change found in normal elderly people and animals and in patients with senile dementia of the Alzheimer type. Further, these studies indicate that microglia appear to play a central role in the pathogenesis of amyloid formation and could be involved in the processing, production, and assembly of the fibers.
Insights
Infectious agents can cause localized amyloid and neuritic plaques, similar to Alzheimer's disease pathology. Microglia play a key role in the formation of these amyloid plaques.
Area of Science:
- Neuroscience
- Pathology
- Infectious Diseases
Background:
- Amyloid and neuritic plaques are hallmarks of aging and neurodegenerative diseases like Alzheimer's.
- The etiology of localized amyloid plaque formation is not fully understood.
Purpose of the Study:
- To investigate the role of infectious agents in localized amyloid and neuritic plaque formation.
- To explore the involvement of microglia in amyloid pathogenesis.
Main Methods:
- Mice were inoculated intracerebrally with scrapie agent-infected brain homogenate.
- Pathological changes, including plaque formation and infiltrations, were observed.
Main Results:
- Intracerebral inoculation induced localized amyloid and neuritic plaques and infiltrations.
- Microglia were identified as potentially central players in amyloid fiber formation.
Conclusions:
- An infectious agent can trigger localized amyloid and neuritic plaque formation.
- Microglia are implicated in the pathogenesis of amyloid formation, potentially processing and assembling amyloid fibers.