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Updated: Aug 26, 2026
A Rat Model of EcoHIV Brain Infection
Published on: January 21, 2021
Levels of human immunodeficiency virus type 1 (HIV-1) replication in macrophages determines the severity of murine
Adeline Nukuna1, Howard E Gendelman, Jenae Limoges
1Center for Neurovirology and Neurodegenerative Disorders, Omahan NE 68195-5215, USA.
Abstract:
The presence of specific neuroinvasive strains and necessity for brain viral replication for disease progression remain controversial issues in neuro-AIDS research. To investigate these questions, the authors injected human monocyte-derived macrophages (MDMs) infected with diverse viral strains were injected into the caudate and putamen of severe combined immunodeficient (SCID) mice. Independent of viral strain, infected MDMs became immunologically activated and elicited profound inflammatory reactions in brain areas most affected in humans. The intensity of neuropathologic changes, including microglial reactions, paralleled levels of viral infection and numbers of infected MDMs. The data suggest that HIV-1-associated neurological disease is related to the level of productive viral infection in activated macrophages. Virus infection, per se, may affect the ability of macrophages to respond to immune stimuli by overproduction of proinflammatory factors and neurotoxins, leading to neuronal dysfunction.
Insights
Neuroinflammation in HIV-1-associated neurological disease is driven by productive viral infection in activated macrophages. This leads to overproduction of inflammatory factors and neurotoxins, causing neuronal dysfunction.
Area of Science:
- Neuroscience
- Immunology
- Virology
Background:
- Controversies exist regarding neuroinvasive strains and viral replication necessity for neuro-AIDS progression.
- Understanding the role of infected macrophages in HIV-1 neurological disease is crucial.
Purpose of the Study:
- To investigate the role of specific viral strains and brain viral replication in disease progression.
- To determine the impact of infected macrophages on neuropathology and neuronal function.
Main Methods:
- Injected human monocyte-derived macrophages (MDMs) infected with diverse HIV-1 strains into SCID mice brains (caudate and putamen).
- Assessed immunological activation, inflammatory reactions, and neuropathologic changes, including microglial reactions.
Main Results:
- Infected MDMs induced significant inflammatory reactions and neuropathologic changes, irrespective of viral strain.
- The intensity of neuropathology correlated with viral infection levels and the number of infected MDMs.
- Activated macrophages overproduced proinflammatory factors and neurotoxins.
Conclusions:
- HIV-1-associated neurological disease is linked to the level of productive viral infection in activated macrophages.
- Virus infection in macrophages may impair immune responses, leading to neurotoxicity and neuronal dysfunction.
