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. 1995 May;69(5):2977–2988. doi: 10.1128/jvi.69.5.2977-2988.1995

Establishment of a stable, inducible form of human immunodeficiency virus type 1 DNA in quiescent CD4 lymphocytes in vitro.

C A Spina 1, J C Guatelli 1, D D Richman 1
PMCID: PMC188997  PMID: 7707524

Abstract

Human immunodeficiency virus type 1 (HIV-1) possesses the ability to establish a complete infection in nondividing host cells. The capacity of HIV-1 to infect nondividing cells probably contributes significantly to its pathology in vivo, as reflected by infection of peripheral T lymphocytes, tissue macrophages, and microglial cells. However, the in vitro demonstration of the establishment of stable HIV-1 infection in quiescent T cells remains controversial. We have developed a primary T-cell model of acute HIV-1 infection of quiescent CD4 lymphocytes that demonstrates the development of a complete, reverse-transcribed form of virus that is stable for over 10 days in culture. To ensure that our primary cell culture was representative of a quiescent population, the CD4 lymphocyte targets were monitored for membrane expression of activation antigens and for shifts in cell cycle from G0/G1 to S/G2 phase. The presence of viral DNA fragments reflecting progressive reverse transcription was determined by PCR analysis. HIV entered primary CD4 cells rapidly, but viral DNA accumulated slowly in the resting cell cultures. DNA species containing regions of full-length reverse transcription were not detected until 3 to 5 days after infection. In parallel with the appearance of complete viral DNA, spliced RNA transcripts, predominantly of the nef species, were detected by reverse transcriptase PCR amplification. When infected CD4 cells were sorted on the basis of cell cycle analysis of DNA content, the accumulation of a complete viral DNA form was found to occur in both the purified G0/G1-phase cell subset and the cell fraction enriched for the minor S-phase subset. In contrast, spliced viral RNA products could be detected only in the enriched S-phase cell fraction. These results demonstrate that HIV-1 can infect and establish a complete, stable form of viral DNA in primary CD4 lymphocytes in vitro but is blocked from transcription in the absence of cell activation. The findings are consistent with in vivo data from HIV-infected individuals that show the existence of viral DNA predominantly as a stable, extrachromosomal form in T cells of the peripheral circulation.

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Selected References

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