Microglia-passaged simian immunodeficiency virus induces neurophysiological abnormalities in monkeys

Area of Science:

• Neuroscience
• Immunology
• Primatology

Background:

• The simian immunodeficiency virus (SIV) model is crucial for understanding human neurodegenerative diseases like AIDS dementia.
• Investigating SIV-induced neurological sequelae in macaques offers insights into pathogenesis and therapeutic strategies.

Purpose of the Study:

• To document the electrophysiological, behavioral, and neuropathological effects of SIV infection in rhesus macaques.
• To validate the use of SIV-infected macaques as a model for human neuroAIDS.

Main Methods:

• Four rhesus macaques were intravenously inoculated with SIV; three were behaviorally trained and tested before and after infection.
• Neurophysiological testing (visual and auditory evoked responses) and neuropathological analysis of brain tissue were performed.
• Control group of five age-matched, behaviorally trained macaques was used for comparison.

Main Results:

• SIV-infected macaques showed abnormal auditory and visual evoked responses.
• Behavioral testing revealed decreased performance in trained monkeys, indicating reduced reinforcer efficacy and impaired attentional set-shifting and motor ability in one subject.
• Neuropathological analysis confirmed T cell infiltration in the brain tissue of all SIV-infected macaques.

Conclusions:

• SIV infection in rhesus macaques induces neurological and behavioral deficits comparable to human neuroAIDS.
• The SIV-macaque model is validated for studying AIDS dementia pathogenesis and evaluating potential therapeutic interventions.