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Published in: Journal of NeuroVirology 1/2014

01-02-2014

Giant cell encephalitis and microglial infection with mucosally transmitted simian-human immunodeficiency virus SHIVSF162P3N in rhesus macaques

Authors: Carole Harbison, Ke Zhuang, Agegnehu Gettie, James Blanchard, Heather Knight, Peter Didier, Cecilia Cheng-Mayer, Susan Westmoreland

Published in: Journal of NeuroVirology | Issue 1/2014

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Abstract

Neurocognitive disorders such as dementia and cognitive/motor impairments are among the most significant complications associated with human immunodeficiency virus (HIV) infection, especially in aging populations, yet the pathogenesis remains poorly understood. Activated macrophages and microglia in white matter along with the hallmark multinucleated giant cells are prominent features of HIV encephalitis (HIVE) and of several simian immunodeficiency virus (SIV) models. While infected microglia have been demonstrated in HIVE, this feature is not routinely seen in experimental infections in rhesus macaques using SIV or chimeric simian/HIV (SHIV) strains, limiting utility in HIV-1 pathogenesis and treatment studies. Here, 50 rhesus macaques were inoculated with the CCR5 (R5)-tropic SHIVSF162P3N virus by one of three routes: intravenously (n = 9), intrarectally (n = 17), or intravaginally (n = 24). Forty-three monkeys became viremic, 26 developed AIDS, and 7 (7/26, 27 %) developed giant cell SIV encephalitis (SIVE). Rapid progressor phenotype was evident in five of seven (71 %) macaques with SIVE, and expansion to utilize the CXCR4 coreceptor (X4 coreceptor switch) was observed in four out of seven (57 %). SIVE lesions were present in gray and white matter in the cerebrum, cerebellum, thalamus, and brain stem of affected animals. Lesions were composed of virally infected CD68+, CD163+, and HLA-DR+ macrophages accompanied by white matter damage, necrosis, and astroglial and microglial activation. Importantly, microglial infection was observed, which makes R5 SHIVSF162P3N infection of macaques an attractive animal model not only to study transmission and HIVE pathogenesis but also to conduct preclinical evaluation of therapeutic interventions aimed at eradicating HIV-1 from the central nervous system (CNS).
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Metadata
Title
Giant cell encephalitis and microglial infection with mucosally transmitted simian-human immunodeficiency virus SHIVSF162P3N in rhesus macaques
Authors
Carole Harbison
Ke Zhuang
Agegnehu Gettie
James Blanchard
Heather Knight
Peter Didier
Cecilia Cheng-Mayer
Susan Westmoreland
Publication date
01-02-2014
Publisher
Springer US
Published in
Journal of NeuroVirology / Issue 1/2014
Print ISSN: 1355-0284
Electronic ISSN: 1538-2443
DOI
https://doi.org/10.1007/s13365-013-0229-z

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