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Clinical-neuropathologic correlation in HIV-associated dementia
J D Glass1, S L Wesselingh, O A Selnes
1Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21287-6965.
Neurology
|November 1, 1993
Summary
HIV-associated dementia (HIVD) neuropathology is often subtle, with standard brain examination missing key changes in half of cases. Elevated tumor necrosis factor-alpha (TNF-alpha) mRNA suggests indirect mechanisms contribute to HIVD.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- HIV-associated dementia (HIVD) presents with unclear structural brain abnormalities.
- Understanding neuropathologic correlates is crucial for diagnosing and treating HIVD.
Observation:
- Multinucleated giant cells and diffuse myelin pallor, specific to HIVD, were present in only 50% of affected patients.
- Antiretroviral therapy for over 12 months reduced the occurrence of these specific neuropathologic changes.
- Elevated tumor necrosis factor-alpha (TNF-alpha) mRNA levels were found in the frontal subcortical white matter of HIVD patients.
Findings:
- Standard histopathology misses key neuropathologic changes in 50% of HIVD cases, indicating more subtle correlates exist.
- Elevated TNF-alpha mRNA levels in HIVD patients correlate with cognitive impairment and specific neuropathologic patterns.
- Antiretroviral therapy appears to mitigate some characteristic neuropathologic changes associated with HIVD.
Implications:
- Subtle neuropathologic changes likely underlie HIVD clinical manifestations.
- Elevated TNF-alpha mRNA suggests that abnormal cytokine expression and indirect mechanisms contribute to HIVD pathogenesis.
- Further research into cytokine dysregulation in HIVD is warranted for potential therapeutic targets.