title: Transcellular activation of the human immunodeficiency virus type 1 long terminal repeat in cocultured lymphocytes.
abstract: One of the unexplained aspects of the progression of AIDS is that immunological abnormalities are detectable before CD4+ T-helper cell depletion occurs (A.R. Gruters, F.G. Terpstra, R. De Jong, C.J.M. Van Noesel, R.A.W. Van Lier, and F. Miedema, Eur. J. Immunol. 20:1039-1044, 1990; F. Miedema, A.J. Chantal-Petit, F.G. Terpstra, J.K.M.E. Schattenkerk, F. de Wolf, B.J.M. Al, M. Roos, J.M.A. Lang, S.A. Danner, J. Goudsmit, and P.T.A. Schellekens, J. Clin. Invest. 82:1908-1914, 1988; G.M. Shearer, D.C. Bernstein, K.S. Tung, C.S. Via, R. Redfield, S.Z. Salahuddin, and R.C. Gallo, J. Immunol. 137:2514-2521, 1986). In this report, we describe a mechanism by which human immunodeficiency virus type 1 (HIV-1)-infected cells can influence neighboring HIV-1-infected T lymphocytes and uninfected T cells as well. We have examined the interaction of T-cell and macrophage cell lines that are transfected with HIV-1 DNA by using cocultured lymphocytes. The HIV-1 constructs we used lack a functional pol gene and therefore do not produce infectious virus. Cocultivation results in the transcellular activation of the HIV long terminal repeat in the cocultured T cells. This transcellular activation is evident in as little as 3 h of cocultivation, at ratios of HIV-expressing cells to target cells as low as 1:1,000, and is dependent on the Tat-responsive element. The demonstration that a small number of HIV-expressing cells can affect a large number of uninfected bystander cells in a short period of time suggests a mechanism by which global immune dysfunction can precede the high prevalence of infected cells.
authors.affiliation: Department of Physiology and Cellular Biophysics, Columbia University, New York, New York 10032.
authors.forename: A
authors.initials: A
authors.lastname: Marcuzzi
authors.forename: J
authors.initials: J
authors.lastname: Weinberger
authors.forename: O K
authors.initials: OK
authors.lastname: Weinberger
mesh_terms: D002460:Cell Line; D015756:Genes, tat; D016325:HIV Long Terminal Repeat; D015497:HIV-1 / Q000235:genetics / Q000254:growth & development*; D006801:Humans; D007700:Kinetics; D008264:Macrophages / Q000382:microbiology; D013601:T-Lymphocytes / Q000166:cytology / Q000382:microbiology*; D015533:Transcriptional Activation