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. 1993 Oct;67(10):5713–5720. doi: 10.1128/jvi.67.10.5713-5720.1993

Mechanisms of immune activation of human immunodeficiency virus in monocytes/macrophages.

R D Schrier 1, J A McCutchan 1, C A Wiley 1
PMCID: PMC237987  PMID: 8371336

Abstract

Monocytes/macrophages (M/M) are the major host of human immunodeficiency virus (HIV) in solid tissues. However, blood monocytes are nonpermissive for HIV infection, indicating that M/M activation or differentiation is necessary for HIV replication. Since M/M are activated during immune responses, we investigated the effect of T-cell activation on HIV expression in M/M derived from peripheral blood of HIV-infected individuals. Previously, we reported that coculture of monocytes from HIV-infected donors with T cells and mitogens resulted in M/M differentiation and HIV expression. Production of HIV by M/M from infected donors required direct contact between monocytes and T cells (for the first 24 h), and the response to alloantigens, but not mitogens, was restricted to HLA-DR. In this study, we found that HIV was more readily recovered from M/M of asymptomatic HIV seropositive donors (69%) than from M/M of symptomatic donors (57%). Viral antigens (e.g., inactivated herpes simplex virus) could initiate the immune response and HIV expression. The ability of noninfected T cells to activate HIV expression in M/M and observations that treatments of M/M with antibodies to deplete T cells did not reduce HIV expression suggested that the monocytes were endogenously infected. To define the aspects of immune activation specifically involved in initiating HIV expression in M/M, interactions of M/M and T cells and participation of cytokines were investigated. The T cell which activated M/M was CD4+ CD8-. Fixed allogeneic cells are known to induce T-cell activation but were not able to serve as antigen for M/M differentiation, suggesting that M/M may need to function as antigen-presenting cells to receive the signal to differentiate and express HIV. Blocking of M/M-T-cell interaction with antibodies directed against LFA-1 or interleukin-1 prevented HIV expression. However, inhibition of later stages of T-cell activation, such as blocking of interleukin-2 receptors, did not diminish HIV expression in M/M. Consistent with the requirement for cell-cell contact between M/M and T cells, a variety of cytokines were unable to initiate HIV replication in M/M. The ability of T cells to induce cellular differentiation and HIV replication in M/M in vitro suggests that initiation of an immune response to an antigen, such as an opportunistic pathogen, could be a mechanism by which HIV disseminates to tissues in vivo.

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Selected References

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