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Journal of Virology, July 1999, p. 5373-5380, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Effects of Soluble CD4 on Simian Immunodeficiency Virus Infection of CD4-Positive and CD4-Negative Cells

Dominik Schenten,1 Luisa Marcon,1,2 Gunilla B. Karlsson,1 Cristina Parolin,1,2 Toshiaki Kodama,3 Norma Gerard,4 and Joseph Sodroski1,5,*

Institute of Microbiology, University of Padua Medical School, Padua, Italy 351212; Oregon Regional Primate Research Center, Beaverton, Oregon 97006-34993; and Perlmutter Laboratory, Children's Hospital, and Departments of Medicine and Pediatrics, Beth Israel Deaconess Medical Center,4 Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute,1 Harvard Medical School, and Department of Immunology and Infectious Diseases, Harvard School of Public Health,5 Boston, Massachusetts 02115

Received 22 December 1998/Accepted 25 March 1999

A soluble form of the CD4 receptor (sCD4) can either enhance or inhibit the infection of cells by simian immunodeficiency virus (SIV) and human immunodeficiency virus. We investigated the basis for these varying effects by studying the entry of three SIV isolates into CD4-positive and CD4-negative cells expressing different chemokine receptors. Infection of CD4-negative cells depended upon the viral envelope glycoproteins and upon the chemokine receptor, with CCR5 and gpr15 being more efficient than STRL33. Likewise, enhancement of infection by sCD4 was observed when CCR5- and gpr15-expressing target cells were used but not when those expressing STRL33 were used. The sCD4-mediated enhancement of virus infection of CD4-negative, CCR5-positive cells was related to the sCD4-induced increase in binding of the viral gp120 envelope glycoprotein to CCR5. Inhibitory effects of sCD4 could largely be explained by competition for virus attachment to cellular CD4 rather than other detrimental effects on virus infectivity (e.g., disruption of the envelope glycoprotein spike). Consistent with this, the sCD4-activated SIV envelope glycoprotein intermediate on the virus was long-lived. Thus, the net effect of sCD4 on SIV infectivity appears to depend upon the degree of enhancement of chemokine receptor binding and upon the efficiency of competition for cellular CD4.

* Corresponding author. Mailing address: Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, 44 Binney St., JFB 824, Boston, MA 02115. Phone: (617) 632-3371. Fax: (617) 632-4338. E-mail: joseph_sodroski{at}dfci.harvard.edu.

Journal of Virology, July 1999, p. 5373-5380, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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