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Published on: May 19, 2015
3D mapping of ventricular and corpus callosum abnormalities in HIV/AIDS
Paul M Thompson1, Rebecca A Dutton, Kiralee M Hayashi
1Laboratory of Neuro Imaging, Dept. of Neurology, UCLA School of Medicine, 635 Charles E. Young Drive South, Suite 225E, Los Angeles, CA 90095-7332, USA. thompson@loni.ucla.edu
Insights
HIV/AIDS significantly alters the brain, causing ventricular expansion and corpus callosum thinning. These structural brain changes correlate with immune decline and cognitive impairment in patients.
Area of Science:
- Neuroimaging
- Computational Anatomy
- HIV/AIDS Research
Background:
- HIV/AIDS affects 40 million globally, often leading to dementia and death.
- Brain impact of HIV/AIDS, particularly on the corpus callosum and ventricular system, is not well understood.
- Existing knowledge gaps hinder effective treatment monitoring for neurological complications.
Purpose of the Study:
- To map structural brain changes in the corpus callosum (CC) and ventricular system in HIV/AIDS patients using computational anatomy.
- To identify specific regions of the brain most affected by HIV/AIDS.
- To correlate observed structural brain alterations with immune system status and cognitive function.
Main Methods:
- Analyzed 51 3D brain MRI scans from 30 non-demented HIV/AIDS patients and 21 HIV-seronegative controls.
- Utilized computational anatomy to create 3D surface mesh reconstructions of the lateral ventricles and CC.
- Compared structural differences between groups and correlated them with viral load, CD4+ T cell counts, and cognitive impairment measures.
Main Results:
- Revealed significant ventricular expansion and corpus callosum thinning in HIV/AIDS patients.
- Demonstrated a correlation between specific ventricular changes and immune system decline (CD4+ T cell counts) and cognitive impairment.
- Found that frontal horn alterations were more distinguishing than occipital/temporal horn changes, and T cell decline linked to anterior CC thinning.
Conclusions:
- The study successfully mapped brain changes in HIV/AIDS, linking them to immune decline and cognitive impairment.
- These neuroimaging findings may serve as potential biomarkers for assessing treatment efficacy in clinical trials.
- Further validation could lead to improved monitoring of anti-viral treatment effects on brain health in HIV/AIDS.
Objective:
40 million people worldwide are now infected with HIV/AIDS, an illness that often leads to rapidly progressing dementia and death. Even so, little is known about how AIDS affects the brain. Using computational anatomy techniques, we mapped how AIDS impacts the corpus callosum (CC) and ventricular system, two systems that show prominent changes on MRI. We (1) identified regions with greatest differences between AIDS patients and healthy controls and (2) correlated specific 3D patterns of structural differences with measures of immune system deterioration and cognitive decline.
Methods:
51 3D brain MRI scans from 30 non-demented AIDS patients (age: 43.4 years +/- 7.6 SD) and 21 HIV-seronegative controls (age: 39.5 years +/- 12.2) were aligned to ICBM standard space. 3D surface mesh reconstructions of the lateral ventricles and CC were spatially averaged and compared across diagnostic groups. Structural alterations were correlated with viral load, T cell counts, and cognitive impairment.
Results:
Statistical maps revealed the 3D profile of ventricular expansion and callosal thinning in AIDS. Specific 3D ventricular changes were linked with immune system decline (CD4+ T cell counts; P < 0.001) and cognitive impairment (P < 0.009), but not viral load. Frontal horn maps distinguished AIDS patients from controls better than occipital and temporal horn measures. T cell decline linked with callosal thinning in anterior regions connecting frontal areas with greatest cortical atrophy.
Conclusion:
These maps (1) reveal how brain changes in HIV/AIDS relate to immune decline and impaired cognition, and, after further validation and testing, (2) may offer possible neuroimaging markers for anti-viral drug trials, which gauge how well treatments oppose disease progression in the brain.
