Characterization of Cells of the Myeloid-Monocytic Lineage (ML-1, HL-60, THP-1, U-937) Chronically Infected with the Human Immunodeficiency Virus-1

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Abstract
The myeloid-monocytic cells ML-1, HL-60, THP-1 and U-937 were chronically infected (for more than 2 years) with the lymphotropic HIV-1 strain HTLV-IIIB. Reinfection experiments revealed that viruses obtained from chronically infected ML-1 /HIV-1 and HL-60/HIV-1 cells show a low infectivity if tested with uninfected ML-1 and HL-60 cells in contrast to virus preparations from chronically infected THP-l/HIV-1 and U-937/HIV-1 with their corresponding uninfected cell lines. Analyses of selected cell surface markers showed a differential expression of CD4, CD8, CD1 lc, CD 14, CD 15, CD20, HLA-DR and HLA-DQ in non- or chronically infected cells. During chronical infection, the myeloid-monocytic cells lost their reactivity with peroxidase and esterase. In chronically infected cells, the steady-state levels for TNF-α mRNA remained unchanged while those for IL-6 decreased. The half-lives of transcripts of both TNF-α (t½: 70 min) and IL-6 (t½: 100 min) were nearly the same in uninfected and chronically infected HL-60 cells.

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