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. 1997 Sep;71(9):6671–6676. doi: 10.1128/jvi.71.9.6671-6676.1997

Human immunodeficiency virus type 1 infection of mature CD3hiCD8+ thymocytes.

S Lee 1, H Goldstein 1, M Baseler 1, J Adelsberger 1, H Golding 1
PMCID: PMC191945  PMID: 9261389

Abstract

Although CD4+ cells are the primary targets of human immunodeficiency virus type 1 (HIV-1) infection, earlier reports have suggested that intrathymic infection of CD8+ cells may occur. However, it was unclear whether HIV-1-infected CD8+ thymocytes were truly mature single-positive (SP) cells. In the present study, SCID mice implanted with human fetal thymus and liver tissues (SCID-hu mice) were infected with three primary isolates of HIV-1 and infected thymocytes were analyzed to assess maturational status. After intra-implant or intraperitoneal injection with HIV-1, thymocytes were sorted by three-color flow cytometric analysis into mature populations of CD3hiCD4+ and CD3hiCD8+ SP cells of > 99% purity (< 0.3% CD4-containing cells in the CD8+ population). The presence of HIV-1 provirus in the sorted thymocyte populations was determined by quantitative PCR. A fraction of mature CD3hiCD8+ thymocytes contained HIV-1 proviral DNA, and evidence of viral mRNA transcription in these cells was demonstrated by in situ hybridization. In contrast, when uninfected CD3hiCD8+ thymocytes were cocultured with HIV-1-infected CD4+ thymocytes, no evidence of productive HIV-1 infection was detected. Thus, HIV-1 infection of CD8+ thymocytes in the SCID-hu mouse does not occur by direct contact with the virus. Rather, cell surface CD4 is required; therefore, precursor cells are the likely primary target of HIV-1 infection in the thymus. During ontogeny, some of these infected cells continue their differentiation into mature CD8+ SP thymocytes that contain proviral DNA and express viral RNA.

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Selected References

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