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Blood, 15 March 2004, Vol. 103, No. 6, pp. 2170-2179.
Prepublished online as a Blood First Edition Paper on November 20, 2003; DOI 10.1182/blood-2003-09-3129.

Submitted September 15, 2003
Accepted October 17, 2003
Immunodeficiency virus uptake, turnover, and two-phase transfer in human dendritic cells
Stuart G Turville, John J Santos, Ines Frank, Paul U Cameron, John Wilkinson, Monica Miranda-Saksena, Joanne Dable, Hella Stossel, Nikolaus Romani, Michael Piatak, Jeffrey D Lifson, Melissa Pope, and Anthony L Cunningham*
Centre For Virus Research, Westmead Millennium Institute, Sydney, NSW, Australia
Centre for Biomedical Research, Population Council, New York, NY, USA
Department of Microbiology and Immunology, University of Melbourne, Melbourne, VIC, Australia
Department of Dermatology and Venereology, University of Innsbruck, Innsbruck, Austria
AIDS Vaccine Program, National Cancer Institute at Frederick, Frederick, MD, USA
* Corresponding author; email: tony_cunningham{at}mail.wmi.usyd.edu.au.
HIV-1 subverts antigen processing in dendritic cells (DCs) resulting in viral uptake, infection, and transfer to T-cells. Although DCs bound monomeric gp120 and HIV-1 similarly, virus rarely co-localized with endolysosomal markers, unlike gp120, suggesting HIV-1 alters endolysosomal trafficking. Virus within DC intracellular compartments rapidly moved to DC-CD4+ lymphocyte synapses when introduced to CD4+ lymphocyte cultures. Although viral harboring and transfer from non-lysosomal compartments was transient, given DC-associated virus protein, nucleic acids, and infectious HIV-1 transfer to CD4+ lymphocytes decayed within 24 hours. However a second long term transfer phase was apparent in immature DCs after 48 hours as a zidovudine-sensitive rise in proviral DNA. Therefore, DCs transfer HIV-1 to CD4+ lymphocytes in two distinct phases. Immature and mature DCs first divert virus from the endolysosomal pathway to the DC-T-cell synapse. Secondly, the later transfer phase from immature DCs is through de novo HIV-1 production. Thus the controversy of DCs being infected or not infected for the mechanics of viral transfer to CD4+ lymphocytes can be addressed as a function of time.

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[Full Text]
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Q. Hu, I. Frank, V. Williams, J. J. Santos, P. Watts, G. E. Griffin, J. P. Moore, M. Pope, and R. J. Shattock
Blockade of Attachment and Fusion Receptors Inhibits HIV-1 Infection of Human Cervical Tissue
J. Exp. Med.,
April 19, 2004;
199(8):
1065 - 1075.
[Abstract]
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