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Journal of Virology, March 2000, p. 2406-2413, Vol. 74, No. 5
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The Decreased Replicative Capacity of Simian Immunodeficiency Virus SIVmac239Delta nef Is Manifest in Cultures of Immature Dendritic Cells and T Cells

Davorka Messmer, Ralf Ignatius, Christine Santisteban, Ralph M. Steinman, and Melissa Pope*

Laboratory of Cellular Immunology and Physiology, The Rockefeller University, New York, New York

Received 11 August 1999/Accepted 7 December 1999

Transmission of simian immunodeficiency virus SIVmac239Delta nef (Delta nef) to macaques results in attenuated replication of the virus in most animals and ultimately induces protection against challenge with some pathogenic, wild-type SIV strains. It has been difficult, however, to identify a culture system in which the replication of Delta nef is severely reduced relative to that of the wild type. We have utilized a primary culture system consisting of blood-derived dendritic cells (DCs) and autologous T cells. When the DCs were fully differentiated or mature, the DC-CD4+ T-cell mixtures supported replication of both the parental SIV strain, 239 (the wild type), and its mutant with nef deleted (Delta nef), irrespective of virus dose and the cell type introducing the virus to the coculture. In contrast, when immature DCs were exposed to Delta nef and cocultured with T cells, virus replication was significantly lower than that of the wild type. Activation of the cultures with a superantigen allowed both Delta nef and the wild type to replicate comparably in immature DC-T-cell cultures. Immature DCs, which, it has been hypothesized, capture and transmit SIV in vivo, are deficient in supporting replication of Delta nef in vitro and may contribute to the reduced pathogenicity of Delta nef in vivo.

* Corresponding author. Mailing address: Laboratory of Cellular Physiology and Immunology, The Rockefeller University, 1230 York Ave., New York, NY 10021. Phone: (212) 327-7794. Fax: (212) 327-7764. E-mail: Popem{at}rockvax.rockefeller.edu.

Journal of Virology, March 2000, p. 2406-2413, Vol. 74, No. 5
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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