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BMC Neurology
Published in: BMC Neurology 1/2018

Open Access 01-12-2018 | Research article

Axonal chronic injury in treatment-naïve HIV+ adults with asymptomatic neurocognitive impairment and its relationship with clinical variables and cognitive status

Authors: Rui-li Li, Jun Sun, Zhen-chao Tang, Jing-ji Zhang, Hong-jun Li

Published in: BMC Neurology | Issue 1/2018

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Abstract

Background

HIV is a neurotropic virus, and it can bring about neurodegeneration and may even result in cognitive impairments. The precise mechanism of HIV-associated white matter (WM) injury is unknown. The effects of multiple clinical contributors on WM impairments and the relationship between the WM alterations and cognitive performance merit further investigation.

Methods

Diffusion tensor imaging (DTI) was performed in 20 antiretroviral-naïve HIV-positive asymptomatic neurocognitive impairment (ANI) adults and 20 healthy volunteers. Whole-brain analysis of DTI metrics between groups was conducted by employing tract-based spatial statistics (TBSS), including fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD) and radial diffusivity (RD). DTI parameters were correlated with clinical variables (age, CD4+ cell count, CD4+/CD8+ ratio, plasma viral load and duration of HIV infection) and multiple cognitive tests by using multilinear regression analyses.

Results

DTI quantified diffusion alterations in the corpus callosum and corona radiata (MD increased significantly, P < 0.05) and chronic axonal injury in the corpus callosum, corona radiata, internal capsule, external capsule, posterior thalamic radiation, sagittal stratum, and superior longitudinal fasciculus (AD increased significantly, P < 0.05). The impairments in the corona radiata had significant correlations with the current CD4+/CD8+ ratios. Increased MD or AD values in multiple white matter structures showed significant associations with many cognitive domain tests.

Conclusions

WM impairments are present in neurologically asymptomatic HIV+ adults, periventricular WM (corpus callosum and corona radiata) are preferential occult injuries, which is associated with axonal chronic damage rather than demyelination. Axonopathy may exist before myelin injury. DTI-TBSS is helpful to explore the WM microstructure abnormalities and provide a new perspective for the investigation of the pathomechanism of HIV-associated WM injury.
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Metadata
Title
Axonal chronic injury in treatment-naïve HIV+ adults with asymptomatic neurocognitive impairment and its relationship with clinical variables and cognitive status
Authors
Rui-li Li
Jun Sun
Zhen-chao Tang
Jing-ji Zhang
Hong-jun Li
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Neurology / Issue 1/2018
Electronic ISSN: 1471-2377
DOI
https://doi.org/10.1186/s12883-018-1069-5

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