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Neural correlates of maintenance working memory, as well as relevant structural qualities, are associated with earlier antiretroviral treatment initiation in vertically transmitted HIV

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Abstract

There is evidence of HIV affecting cognitive functioning across age groups, with adult studies showing related deficits in frontostriatal and hippocampal regional activity. Additionally, delayed initiation of antiretroviral treatment (ART) has been associated with poorer cognitive outcomes in HIV-infected youth. Little is known, however, of the neural correlates underlying such cognitive deficits in youth populations. We investigated maintenance working memory–related brain activity in South African HIV-infected youth and controls, and the effect of ART initiation age on underlying structures. Sixty-four perinatally infected youth (ages 9–12) and 20 controls (ages 9–13) underwent functional magnetic resonance imaging (fMRI) while completing 1-back and 0-back blocks of the N-back task. At an uncorrected p value threshold of 0.001, the HIV-infected group showed decreased activation in the left superior temporal gyrus, pre- and postcentral gyri, insula, and putamen as well as bilateral hippocampus, and mid cingulum. The HIV patients with delayed ART initiation showed less activation during processing conditions in the mid cingulum; left inferior parietal gyrus; and right inferior frontal, bilateral thalamic, and superior temporal regions. When these regions were tested for structural differences, the mid cingulum and right inferior frontal gyrus, insula, and thalamus were found to have less cortical thickness, surface area, or volume in the group with delayed ART initiation. Regional differences between HIV-infected youth and controls noted in the N-back task are consistent with impairments in structures involved in maintenance working memory. These data support earlier ART initiation in perinatally infected individuals.

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Funding

JH has received support from Medical Research Council (MRC) of South Africa. HZ and DS are supported by the National Research Foundation (NRF) and the Medical Research Council (MRC) of South Africa. This research was supported by NICHD under grant R01HD074051.

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Authors and Affiliations

  1. Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa

    Sarah J. Heany, Nicole Phillips, Samantha Brooks, Jean-Paul Fouche, Dan J. Stein & Jacqueline Hoare

  2. Division of Epidemiology & Biostatistics, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa

    Landon Myer

  3. Department of Paediatrics & Child Health, Red Cross Children’s Hospital, University of Cape Town, Cape Town, South Africa

    Heather Zar

  4. SA Medical Research Council Unit on Child & Adolescent Health, Cape Town, South Africa

    Heather Zar

  5. SA Medical Research Council Unit on Risk & Resilience in Mental Disorders, Cape Town, South Africa

    Dan J. Stein

Authors
  1. Sarah J. Heany
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  2. Nicole Phillips
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  3. Samantha Brooks
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  4. Jean-Paul Fouche
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  5. Landon Myer
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  6. Heather Zar
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  7. Dan J. Stein
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  8. Jacqueline Hoare
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Corresponding author

Correspondence to Sarah J. Heany.

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Ethical approval for human participant recruitment was granted by the Human Research Ethics Committee of the Faculty of Health Sciences at the University of Cape Town (HREC REF 051/2013), and the study was performed in accordance with the latest Declaration of Helsinki.

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The authors declare that they have no conflict of interest.

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Heany, S.J., Phillips, N., Brooks, S. et al. Neural correlates of maintenance working memory, as well as relevant structural qualities, are associated with earlier antiretroviral treatment initiation in vertically transmitted HIV. J. Neurovirol. 26, 60–69 (2020). https://doi.org/10.1007/s13365-019-00792-5

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  • DOI: https://doi.org/10.1007/s13365-019-00792-5

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