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Blood, Vol. 96 No. 3 (August 1), 2000: pp. 785-793

PLENARY PAPER


Prolonged survival and tissue trafficking following adoptive transfer of CD4zeta gene-modified autologous CD4+ and CD8+ T cells in human immunodeficiency virus-infected subjects

Ronald T. Mitsuyasu, Peter A. Anton, Steven G. Deeks, David T. Scadden, Elizabeth Connick, Matthew T. Downs, Andreas Bakker, Margo R. Roberts, Carl H. June, Sayeh Jalali, Andy A. Lin, Rukmini Pennathur-Das, and Kristen M. Hege

From the University of California, Los Angeles, CA; San Francisco General Hospital, San Francisco, CA; Massachusetts General Hospital, Boston, MA; University of Colorado Health Science Center, Denver, CO; Statistics Collaborative, Washington DC; Specialty Labs, Los Angeles, CA; University of Virginia, Charlottesville, VA; University of Pennsylvania, Philadelphia, PA; and Cell Genesys, Inc, Foster City, CA.

We have genetically engineered CD4+ and CD8+ T cells with human immunodeficiency virus (HIV) specificity by inserting a gene, CD4zeta , containing the extracellular domain of human CD4 (which binds HIV env) linked to the zeta (zeta ) chain of the T-cell receptor (which mediates T-cell activation). Twenty-four HIV-positive subjects received a single infusion of 2 to 3 × 1010 autologous CD4zeta -modified CD4+ and CD8+ T cells administered with (n = 11) or without (n = 13) interleukin-2 (IL-2). Subjects had CD4 counts greater than 50/µL and viral loads of at least 1000 copies/mL at entry. T cells were costimulated ex vivo through CD3 and CD28 and expanded for approximately 2 weeks. CD4zeta was detected in 1% to 3% of blood mononuclear cells at 8 weeks and 0.1% at 1 year after infusion, and survival was not enhanced by IL-2. Trafficking of gene-modified T cells to bulk rectal tissue and/or isolated lamina propria lymphocytes was documented in a subset of 5 of 5 patients at 14 days and 2 of 3 at 1 year. A greater than 0.5 log mean decrease in rectal tissue-associated HIV RNA was observed for at least 14 days, suggesting compartmental antiviral activity of CD4zeta T cells. CD4+ counts increased by 73/µL at 8 weeks in the group receiving IL-2. There was no significant mean change in plasma HIV RNA or blood proviral DNA in either treatment arm. This sustained, high-level persistence of gene-modified T cells demonstrates the feasibility of ex vivo T-cell gene therapy in HIV-infected adults and suggests the importance of providing HIV-specific T-helper function.


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