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Journal of Virology, June 2000, p. 5016-5023, Vol. 74, No. 11
0022-538X/00/$04.00+0

Coreceptor Competition for Association with CD4 May Change the Susceptibility of Human Cells to Infection with T-Tropic and Macrophagetropic Isolates of Human Immunodeficiency Virus Type 1

Shirley Lee,1 Cheryl K. Lapham,1 Hong Chen,2 Lisa King,1 Jody Manischewitz,1 Tatiana Romantseva,1 Howard Mostowski,3 Tzanko S. Stantchev,2 Christopher C. Broder,2 and Hana Golding1,*

Division of Viral Products1 and Division of Cell and Gene Therapy,3 Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892, and Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 208142

Received 24 November 1999/Accepted 7 March 2000

The chemokine receptors CCR5 and CXCR4 were found to function in vivo as the principal coreceptors for M-tropic and T-tropic human immunodeficiency virus (HIV) strains, respectively. Since many primary cells express multiple chemokine receptors, it was important to determine if the efficiency of virus-cell fusion is influenced not only by the presence of the appropriate coreceptor (CXCR4 or CCR5) but also by the levels of other coreceptors expressed by the same target cells. We found that in cells with low to medium surface CD4 density, coexpression of CCR5 and CXCR4 resulted in a significant reduction in the fusion with CXCR4 domain (X4) envelope-expressing cells and in their susceptibility to infection with X4 viruses. The inhibition could be reversed either by increasing the density of surface CD4 or by antibodies against the N terminus and second extracellular domains of CCR5. In addition, treatment of macrophages with a combination of anti-CCR5 antibodies or beta -chemokines increased their fusion with X4 envelope-expressing cells. Conversely, overexpression of CXCR4 compared with CCR5 inhibited CCR5-dependent HIV-dependent fusion in 3T3.CD4.401 cells. Thus, coreceptor competition for association with CD4 may occur in vivo and is likely to have important implications for the course of HIV type 1 infection, as well as for the outcome of coreceptor-targeted therapies.

* Corresponding author. Mailing address: Division of Viral Products, Center for Biologics Evaluation and Research, FDA, HFM-454. Bldg. 29B/Rm. 4NN04, 8800 Rockville Pike, Bethesda, MD 20892. Phone: (301) 827-0784. Fax: (301) 496-1810. E-mail: GoldingH{at}CBER.FDA.gov.

Journal of Virology, June 2000, p. 5016-5023, Vol. 74, No. 11
0022-538X/00/$04.00+0


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