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. 1994 Sep;1(5):531–537. doi: 10.1128/cdli.1.5.531-537.1994

Blood monocytes from most human immunodeficiency virus type 1-infected patients do not carry proviral DNA.

Y Shen 1, J Rudnik 1, S Cassol 1, J Drouin 1, W Cameron 1, C A Izaguirre 1, L G Filion 1
PMCID: PMC368331  PMID: 8556497

Abstract

In blood, the CD4+ T cells of patients with human immunodeficiency virus type 1 (HIV-1) harbor HIV-1; however, whether the CD4+ blood monocytes carry the virus is controversial. Tissue macrophages are known to be infected. To determine in blood monocytes from HIV-1-seropositive patients contain HIV-1, we separated monocytes and T-cell subsets by using monoclonal antibodies bound to magnetic beads and by monocyte adherence to glass. Monocytes were cultured with macrophage colony-stimulating factor, granulocyte-macrophage colony-stimulating factor, and interleukin-3. After 14 days in culture, cells were analyzed for the presence of HIV-1 antigen and multinucleated giant cells (MGCs). Freshly isolated cell subsets were analyzed for HIV-1 proviral DNA by PCR with modified env (SK68i and SK69i2) and gag (SK145i and SK150) primers. We found that (i) monocytes cultured without depletion of CD4+ T cells (11 of 11 patients) were HIV-1 antigen positive and showed dramatically increased spontaneous formation of MGCs (ii) monocytes cultured after depletion of CD4+ T cells (three experiments) were HIV-1 antigen negative and showed markedly decreased MGC formation, and (iii) in specimens from 14 patients subsequently analyzed by PCR, purified CD4+ T cells were positive for HIV-1 proviral DNA in all patients. In 11 of 14 patients (79%), the monocyte fractions were HIV-1 proviral DNA negative, while in the remaining 3 patients, the monocytes were positive for HIV-1 proviral DNA. In conclusion, the major reservoir for HIV-1 infection in human peripheral blood is the CD4+ T cell (14 of 14 cases).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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