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Journal of Virology, February 2004, p. 1243-1255, Vol. 78, No. 3
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.3.1243-1255.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Isolation of CD4-Independent Primary Human Immunodeficiency Virus Type 1 Isolates That Are Syncytium Inducing and Acutely Cytopathic for CD8+ Lymphocytes

Bouchra Zerhouni,1 Julie A. E. Nelson,2 and Kunal Saha1*

Children's Research Institute, Children's Hospital, and Department of Molecular Virology, Immunology and Medical Genetics, The Ohio State University Medical Center, Columbus,1 Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, Ohio2

Received 30 June 2003/ Accepted 14 October 2003

Previous studies have established the existence of CD4-independent simian immunodeficiency virus, human immunodeficiency virus type 2 (HIV-2), and laboratory strains of HIV-1. However, whether CD4-independent viruses may also exist in HIV-1-infected patients has remained unclear. We have recently reported the isolation of viruses from an AIDS patient that were able to infect CD8+ cells independent of CD4, using CD8 as a receptor. Using a similar approach, here we examined viruses from 12 randomly selected patients (obtained from the AIDS Research and Reference Program, National Institutes of Health) for the presence of CD4-independent HIV-1. CD4-independent variants were isolated from infected CD8+ cells from the viral quasispecies of 7 of 12 patients. The CD4-independent isolates were able to infect primary CD8+ cells as well as a CD4- CD8+ T-cell line. Soluble CD4 and blocking anti-CD4 or -CD8 antibody had no effect on infection of CD8+ cells. Remarkably, two of the seven CD4-independent isolates, but not their parental bulk viruses, induced syncytia and caused acute death of infected CD8+ cells. Some of the CD4-independent variants were also able to infect U87 cells that were negative for CD4, CD8, and common HIV coreceptors, suggesting a novel entry mechanism for these isolates. The CD4-independent isolates were derived from adults and children infected with subtypes A, B, and D. Although no common motif for CD4 independence was found, novel sequence changes were observed in critical areas of the envelopes of the CD4-independent viruses. These results demonstrate that HIV-1-infected patients can frequently harbor viruses that are able to mediate CD4-independent infection of CD8+ cells. In addition, this study also provides evidence of primary HIV-1 variants that are syncytium inducing and acutely cytopathic for CD8+ lymphocytes.

* Corresponding author. Mailing address: Children's Research Institute, 700 Children's Dr., Room W532, Columbus, OH 43205. Phone: (614) 722-2688 or -2683. Fax: (614) 722-3273. E-mail: sahak{at}pediatrics.ohio-state.edu.

Journal of Virology, February 2004, p. 1243-1255, Vol. 78, No. 3
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.3.1243-1255.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Beaumont, E., Vendrame, D., Verrier, B., Roch, E., Biron, F., Barin, F., Mammano, F., Brand, D. (2009). Matrix and Envelope Coevolution Revealed in a Patient Monitored since Primary Infection with Human Immunodeficiency Virus Type 1. J. Virol. 83: 9875-9889 [Abstract] [Full Text]  
  • Zerhouni, B., Nelson, J. A. E., Saha, K. (2004). CXCR4-Dependent Infection of CD8+, but Not CD4+, Lymphocytes by a Primary Human Immunodeficiency Virus Type 1 Isolate. J. Virol. 78: 12288-12296 [Abstract] [Full Text]  
  • Cochrane, A., Imlach, S., Leen, C., Scott, G., Kennedy, D., Simmonds, P. (2004). High Levels of Human Immunodeficiency Virus Infection of CD8 Lymphocytes Expressing CD4 In Vivo. J. Virol. 78: 9862-9871 [Abstract] [Full Text]  


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