1887

Abstract

For some time there has been evidence suggesting an interaction between human cytomegalovirus (HCMV) and (HIV) in the pathogenesis of AIDS. Here, the interaction of HCMV and HIV-1 was examined in monocyte/macrophage cells, two cell types known to be targets for both viruses . Infection experiments demonstrated that prior infection with HCMV impeded subsequent superinfection with HIV-1. In contrast, uninfected bystander cells within the population were still permissive for HIV-1 infection and were also found to express increased levels of Gag after HIV-1 superinfection. Analysis of CCR5, a co-receptor for HIV-1, on HCMV-infected and bystander cells showed a substantial loss of surface CCR5 expression on infected cells due to HCMV-induced reduction of total cellular CCR5. In contrast, uninfected bystander cells displayed increased surface CCR5 expression. Furthermore, the data suggested that soluble factor(s) secreted from HCMV-infected cells were responsible for the observed upregulation of CCR5 on uninfected bystander cells. Taken together, these results suggest that, whilst HCMV-infected monocytes/macrophages are refractory to infection with HIV-1, HCMV-uninfected bystander cells within a population are more susceptible to HIV-1 infection. On this basis, HCMV infection may contribute to the pathogenesis of HIV-1.

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2006-08-01
2020-10-29
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