Clinical-neuropathologic correlation in HIV-associated dementia.
The structural abnormalities that correlate with the clinical manifestations of HIV-associated dementia (HIVD) are unclear. In a prospectively categorized group of patients with and without HIVD who were followed to autopsy, we correlated HIV-related neuropathologic changes with the presence and severity of HIVD. We also assessed the effect of antiretroviral therapy on the neuropathologic changes. Finally, using reverse transcriptase-polymerase chain reaction on homogenized brain tissue, we correlated the relative expression of mRNA for tumor necrosis factor-alpha (TNF-alpha) with cognitive impairment and with the patterns of neuropathologic changes. The presence of multinucleated giant cells and diffuse myelin pallor were specific for HIVD, but these pathologic changes occurred in only 50% of patients with dementia. Patients treated with antiretroviral agents for > 12 months were less likely to show multinucleated giant cells or diffuse myelin pallor. Levels of mRNA for TNF-alpha from frontal subcortical white matter were significantly greater in patients with HIVD than in AIDS patients without dementia or in seronegative controls. We conclude that routine histopathologic examination of the brain fails to detect multinucleated giant cells and diffuse myelin pallor in 50% of patients dying with HIVD. This suggests that more subtle neuropathologic correlates for the clinical manifestations of HIVD exist. Our observations of elevated levels of TNF-alpha mRNA in HIVD indicate that indirect mechanisms of brain dysfunction, such as abnormal cytokine expression, may contribute to the pathogenesis of HIVD.
Glass
J D
JD
Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21287-6965.
Wesselingh
S L
SL
Selnes
O A
OA
McArthur
J C
JC
D015526:AIDS Dementia Complex / Q000188:drug therapy / Q000473:pathology*; D000328:Adult; D000998:Antiviral Agents / Q000627:therapeutic use; D001483:Base Sequence; D001921:Brain / Q000473:pathology*; D016207:Cytokines / Q000032:analysis; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D011446:Prospective Studies; D012333:RNA, Messenger / Q000032:analysis; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis
D000998:Antiviral Agents; D016207:Cytokines; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha