Abstract
Astrocytes are the most abundant cells in the central nervous system and play important roles in human immunodeficiency virus (HIV)/neuro-acquired immunodeficiency syndrome. Detection of HIV proviral DNA, RNA, and early gene products but not late structural gene products in astrocytes in vivo and in vitro indicates that astrocytes are susceptible to HIV infection albeit in a restricted manner. We as well as others have shown that cell-free HIV is capable of entering CD4− astrocytes through human mannose receptor-mediated endocytosis. In this study, we took advantage of several newly developed fluorescence protein-based HIV reporter viruses and further characterized HIV interaction with astrocytes. First, we found that HIV was successfully transferred to astrocytes from HIV-infected CD4+ T cells in a cell–cell contact- and gp120-dependent manner. In addition, we demonstrated that, compared to endocytosis-mediated cell-free HIV entry and subsequent degradation of endocytosed virions, the cell–cell contact between astrocytes and HIV-infected CD4+ T cells led to robust HIV infection of astrocytes but retained the restricted nature of viral gene expression. Furthermore, we showed that HIV latency was established in astrocytes. Lastly, we demonstrated that infectious progeny HIV was readily recovered from HIV latent astrocytes in a cell–cell contact-mediated manner. Taken together, our studies point to the importance of the cell–cell contact-mediated HIV interaction with astrocytes and provide direct evidence to support the notion that astrocytes are HIV latent reservoirs in the central nervous system.
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Acknowledgments
We would like to thank Dr. Benjamin Chen of Mount Sinai School of Medicine for gagi and NLGi plasmids and Dr. I. Sadowski and Dr. S. Viviana of University of British Columbia, Canada, for RGH plasmid. We would also like to thank Drs. Anuja Ghorpade, Robert Wordinger and Porunelloor Mathew for their advices and inputs throughout the study. This work was supported in part by the grants NIH/NINDS R01NS065785 and NIH/NIMH R01MH092673 (to JJH) from National Institutes of Health.
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Luo, X., He, J.J. Cell–cell contact viral transfer contributes to HIV infection and persistence in astrocytes. J. Neurovirol. 21, 66–80 (2015). https://doi.org/10.1007/s13365-014-0304-0
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DOI: https://doi.org/10.1007/s13365-014-0304-0