HIV-Tat regulates macrophage gene expression in the context of neuroAIDS

Loreto Carvallo, Lillie Lopez, Jorge E. Fajardo, Matias Jaureguiberry-Bravo, Andras Fiser, Joan W. Berman

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Despite the success of cART, greater than 50% of HIV infected people develop cognitive and motor deficits termed HIV-associated neurocognitive disorders (HAND). Macrophages are the major cell type infected in the CNS. Unlike for T cells, the virus does not kill macrophages and these long-lived cells may become HIV reservoirs in the brain. They produce cytokines/chemokines and viral proteins that promote inflammation and neuronal damage, playing a key role in HIV neuropathogenesis. HIV Tat is the transactivator of transcription that is essential for replication and transcriptional regulation of the virus and is the first protein to be produced after HIV infection. Even with successful cART, Tat is produced by infected cells. In this study we examined the role of the HIV Tat protein in the regulation of gene expression in human macrophages. Using THP-1 cells, a human monocyte/macrophage cell line, and their infection with lentivirus, we generated stable cell lines that express Tat-Flag. We performed ChIP-seq analysis of these cells and found 66 association sites of Tat in promoter or coding regions. Among these are C5, CRLF2/TSLPR, BDNF, and APBA1/Mint1, genes associated with inflammation/damage. We confirmed the association of Tat with these sequences by ChIP assay and expression of these genes in our THP-1 cell lines by qRT-PCR. We found that HIV Tat increased expression of C5, APBA1, and BDNF, and decreased CRLF2. The K50A Tat-mutation dysregulated expression of these genes without affecting the binding of the Tat complex to their gene sequences. Our data suggest that HIV Tat, produced by macrophage HIV reservoirs in the brain despite successful cART, contributes to neuropathogenesis in HIV-infected people.

Original languageEnglish (US)
Article numbere0179882
JournalPLoS One
Volume12
Issue number6
DOIs
StatePublished - Jun 1 2017

Fingerprint

Macrophages
Gene expression
macrophages
HIV
Gene Expression
gene expression
Genes
Brain-Derived Neurotrophic Factor
Cells
cell lines
Viruses
cells
Brain
Human Immunodeficiency Virus tat Gene Products
inflammation
Association reactions
brain
viruses
Lentivirus
Trans-Activators

ASJC Scopus subject areas

  • Medicine(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

HIV-Tat regulates macrophage gene expression in the context of neuroAIDS. / Carvallo, Loreto; Lopez, Lillie; Fajardo, Jorge E.; Jaureguiberry-Bravo, Matias; Fiser, Andras; Berman, Joan W.

In: PLoS One, Vol. 12, No. 6, e0179882, 01.06.2017.

Research output: Contribution to journalArticle

Carvallo, Loreto ; Lopez, Lillie ; Fajardo, Jorge E. ; Jaureguiberry-Bravo, Matias ; Fiser, Andras ; Berman, Joan W. / HIV-Tat regulates macrophage gene expression in the context of neuroAIDS. In: PLoS One. 2017 ; Vol. 12, No. 6.
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