Abstract
The relationship between T-cell activation and early events in the replication cycle of simian immunodeficiency virus (SIV) was analyzed in resting T lymphocytes from macaques. We used the polymerase chain reaction to detect an early product of reverse transcription (R/U5) and almost complete viral DNA (long terminal repeat/gag). We found that SIV can enter resting T lymphocytes and initiate replication but that the reverse transcription process is not efficient and proceeds slowly in resting cells. Cross-linking the CD3/T-cell receptor complex with monoclonal antibodies, unlike cross-linking either the CD28 or CD2 accessory receptor and like phorbol myristate acetate, induced a rapid increase in viral R/U5 DNA detected within 3 to 6 h postinfection. Anti-CD3 or phorbol myristate acetate induced replication of full-length viral DNA within 6 to 9 h postinfection, but full-length SIV DNA was not detectable at earlier time points. We then compared various inhibitors of T-cell activation for their effects on viral initiation and complete replication. Cyclosporin A, an inhibitor of a distal step in T-cell activation, blocked anti-CD3-induced T-cell proliferation and completion of SIV DNA replication but had no effect on induced increases in SIV R/U5 DNA. By contrast, initial SIV DNA synthesis was partially blocked by inhibitors of very early steps in T-cell activation, including herbimycin A, an inhibitor of protein tyrosine kinases, and by two different inhibitors of protein kinase C, H7 and staurosporine. Since resting T cells do not efficiently complete SIV DNA synthesis and cyclosporin A can block the formation of complete viral DNA induced in activated T cells, a cellular factor(s) present in activated T cells appears to be required for the formation of full-length SIV DNA.
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