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J. Virol., Jun 1996, 3863-3869, Vol 70, No. 6
S Sonza, A Maerz, N Deacon, J Meanger, J Mills and S Crowe
Peripheral blood monocytes are resistant to productive human
immunodeficiency virus type 1 (HIV-1) infection in vitro immediately after
isolation. No viral cDNA (either early or late transcripts) was detected by
PCR in monocytes exposed to virus on the day of isolation. In contrast, in
monocytes cultured for as little as 1 day, initiated and completed reverse
transcripts were readily detectable within 24 h of infection with both
HIV-1(Ba-L) and primary isolates. The levels of initiated, partially
completed, and completed viral DNA copies found 24 h after infection
increased progressively with time in culture before infection. Unlike
quiescent T lymphocytes, there appeared to be no block or delay in the
integration of viral DNA into the genome of susceptible cultured monocytes.
With an Alu-PCR method designed to specifically detect proviral DNA being
used, integration events were found within 24 h of infection in monocytes
cultured for a day or more after isolation. No integration signal was found
in freshly isolated monocytes up to 7 days following exposure to the virus.
Cloning and sequencing of Alu-PCR-amplified DNA confirmed integration in
HIV-1- infected cultured monocytes. Our finding that in vitro replication
of HIV-1 is clearly blocked prior to the initiation of reverse
transcription in freshly isolated peripheral blood monocytes suggests that
these cells may not be susceptible to infection in vivo. Further studies to
clarify this possibility and the nature of the block to infection should
provide useful information for treatment strategies against HIV-1.
Copyright © 1996, American Society for Microbiology
Human immunodeficiency virus type 1 replication is blocked prior to reverse transcription and integration in freshly isolated peripheral blood monocytes
AIDS Pathogenesis Unit, Macfarlane Burnet Centre for Medical Research, Melbourne, Australia. sonza@burner.mbcmr.unimalb.edu.au
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