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Journal of Virology, May 2004, p. 5523-5527, Vol. 78, No. 10
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.10.5523-5527.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Characterization of Restrictions to Human Immunodeficiency Virus Type 1 Infection of Monocytes

Karine Triques and Mario Stevenson*

Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts 01605

Received 31 October 2003/ Accepted 7 January 2004

Tissue macrophages are an important cellular reservoir for replication of human immunodeficiency virus type 1 (HIV-1) and simian immunodeficiency virus. In vitro, the ability of macrophages to support viral replication is differentiation dependent in that precursor monocytes are refractory to infection. There is, however, no consensus as to the exact point at which infection is restricted in monocytes. We have revisited this issue and have compared the efficiencies of early HIV-1 replication events in monocytes and in differentiated macrophages. Although virus entry in monocytes was comparable to that in differentiated macrophages, synthesis of full-length viral cDNAs was very inefficient. Relative to differentiated macrophages, monocytes contained low levels of dTTP due to low thymidine phosphorylase activity. Exogenous addition of D-thymidine increased dTTP levels to that in differentiated macrophages but did not correct the reverse transcription defect. These results point to a restriction in monocytes that is independent of reverse transcription precursors and suggest that differentiation-dependent cellular cofactors of reverse transcription are rate limiting in monocytes.

* Corresponding author. Mailing address: Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation St., Suite 319, Worcester, MA 01605. Phone: (508) 856-4582. Fax: (508) 856-4075. E-mail: mario.stevenson{at}umassmed.edu.

Journal of Virology, May 2004, p. 5523-5527, Vol. 78, No. 10
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.10.5523-5527.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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