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Serial pathogenesis study of SIV brain infection.
L R Sharer1, J Michaels, M Murphey-Corb
1New Jersey Medical School, Newark.
Journal of Medical Primatology
|June 1, 1991
Summary
Early simian immunodeficiency virus (SIV) brain infection primarily affects the leptomeninges and perivascular areas. SIV encephalitis severity links to systemic illness, not infection duration, with monocytes/macrophages driving brain spread.
Area of Science:
- Neurology
- Virology
- Immunology
Background:
- Simian immunodeficiency virus (SIV) is a model for human immunodeficiency virus (HIV) infection.
- Understanding SIV neuropathogenesis is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the temporal and spatial patterns of early SIV brain infection.
- To determine factors correlating with SIV encephalitis severity.
Main Methods:
- Serial examination of SIV-infected brains.
- Histopathological analysis to identify viral distribution and cellular involvement.
Main Results:
- Early SIV infection involved the leptomeninges and perivascular parenchyma.
- SIV encephalitis severity correlated with systemic disease, not infection duration.
- Minimal SIV infection of brain endothelial cells and no diffuse white matter disease were observed.
- Leptomeningeal and brain infections appeared distinct, with monocytes/macrophages mediating brain entry.
Conclusions:
- SIV brain infection follows a specific pattern, starting in the meninges and spreading perivascularly.
- Systemic disease severity is a key determinant of SIV encephalitis.
- Monocyte/macrophage trafficking is a primary route for SIV entry into the brain parenchyma.