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. 1994 Sep;32(9):2152–2157. doi: 10.1128/jcm.32.9.2152-2157.1994

Quantification of human immunodeficiency virus type 1-infected mononuclear cells in peripheral blood of seropositive subjects by newly developed flow cytometry analysis of the product of an in situ PCR assay.

M C Re 1, G Furlini 1, D Gibellini 1, M Vignoli 1, E Ramazzotti 1, E Lolli 1, S Ranieri 1, M La Placa 1
PMCID: PMC263958  PMID: 7814539

Abstract

The presence of human immunodeficiency virus type 1 (HIV-1) proviral DNA in peripheral blood mononuclear cells (PBMC) of three groups (group 1, more than 500 CD4+ T cells per microliter; group 2, between 200 and 499 CD4+ T cells per microliter; group 3, fewer than 200 CD4+ T cells per microliter) of HIV-1-infected patients, in different stages of the disease, was determined by using a newly developed flow cytometry analysis of the product of in situ PCR assay and compared with other markers of viral replication (HIV-1 p24 antigenemia and viral isolation). Results showed varied percentages of HIV-1-infected PBMC, ranging from 0.6 to 20%. Patients with more than 500 CD4+ T cells per microliter showed the lowest percentage of HIV-1-infected PBMC (2.1 +/- 1.7), compared with patients with CD4+ T-cell counts of between 200 and 499 per microliter (6.5% +/- 4.1%; P < 0.001) and patients with fewer than 200 CD4+ T cells per microliter (4.9% +/- 4.7%; P < 0.05). The difference in the percentage of HIV-1-infected PBMC between group 2 and group 3 patients may in part reflect the loss of CD4+ T lymphocytes in more advanced stages of the disease. However, the results clearly indicate a striking coincidence between the fall of the CD4+ T-cell count below 400/microliter and the sharp increase in PBMC virus loading and p24 antigenemia. Since the procedure is relatively easy to perform, it could be used to monitor the evolution of HIV-1 infection and may prove a useful adjunct in tailoring therapeutic strategies.

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Selected References

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