Abstract
We describe a novel experimental approach to analyzing virus-host relationships and potential mechanisms of cytopathicity in vivo in simian immunodeficiency virus (SIV) infections. Progressive destruction of lymphoid tissue in the course of infection by SIV or human immunodeficiency virus (HIV) accompanies the loss of CD4+ T lymphocytes and sets the stage for AIDS1,2. Because one of the important early events in this pathological process is lysis of follicular dendritic cells3 (FDCs), we investigated the controversial role of productive SIV infection in the destruction of FDCs. To differentiate productive infections from the known association of virus with FDCs as immune complexes trapped on cell surfaces4–6, we used detection of spliced viral mRNAs in cells as evidence of productive infection. We found that spliced and unspliced viral RNAs could be detected by in situ hybridization (ISH) with specific antisense oligonucleotide probes in lymphocytes and macrophages with sensitivities of fewer than ten copies of spliced viral RNA per cell. We detected only unspliced RNA in germinal centers where FDCs reside. Thus, no productive infection of these cells can be detected in vivo by this assay, and their destruction likely occurs by indirect mechanisms that have yet to be determined.
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Reinhart, T., Rogan, M., Viglianti, G. et al. A new approach to investigating the relationship between productive infection and cytopathicity in vivo. Nat Med 3, 218–221 (1997). https://doi.org/10.1038/nm0297-218
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DOI: https://doi.org/10.1038/nm0297-218
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