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Cortical dendritic pathology in human immunodeficiency virus encephalitis
1Department of Neurosciences, School of Medicine, University of California, San Diego, La Jolla.
Summary
Human immunodeficiency virus encephalitis (HIVE) causes significant damage to the dendritic tree of neocortical neurons. This study quantifies HIVE-related dendritic alterations, revealing primary damage to dendrites rather than synapses.
Area of Science:
- Neuroscience
- Neuropathology
- Immunology
Background:
- Human immunodeficiency virus encephalitis (HIVE) is associated with neuronal loss and dendritic pathology.
- Previous studies indicate decreased large neurons and synaptophysin immunoreactivity in HIVE.
- Dendritic alterations are implicated but require further quantification.
Purpose of the Study:
- To characterize and quantify dendritic tree alterations in neocortical pyramidal neurons in HIVE.
- To compare dendritic morphology in HIVE cases, HIV-positive controls, and HIV-negative controls.
- To determine if dendritic damage is a primary feature of HIVE.
Main Methods:
- Modified Golgi impregnation technique on frontal cortex tissue.
- Comparison of 5 HIVE cases, 5 HIV-positive controls, and 5 HIV-negative controls.
- Computer-aided quantification and laser confocal imaging of dendritic structures and spine density.
Main Results:
- Apical dendrites in HIVE cases were dilated, vacuolated, tortuous, with reduced length and branching.
- Basal and oblique dendrites showed similar but less severe alterations.
- A 40-60% decrease in spine density was observed in HIVE cases, with aberrant spines noted.
- Dendritic remodeling, including lacunae and filopodia, was present.
Conclusions:
- Dendritic damage is a prominent feature of human immunodeficiency virus encephalitis (HIVE).
- The findings suggest primary dendritic pathology in HIVE.
- This contrasts with other neurodegenerative disorders where presynaptic pathology is primary.