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M9490074.TXT
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1994-09-03
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Document 0074
DOCN M9490074
TI Human immunodeficiency virus type 1 Tat activity in human neuronal
cells: uptake and trans-activation.
DT 9411
AU Kolson DL; Collman R; Hrin R; Balliet JW; Laughlin M; McGann KA; Debouck
C; Gonzalez-Scarano F; Department of Neurology, University of
Pennsylvania Medical; Center, Philadelphia 19104.
SO J Gen Virol. 1994 Aug;75 ( Pt 8):1927-34. Unique Identifier : AIDSLINE
MED/94321982
AB Neurological dysfunction in AIDS occurs in the absence of productive
infection of neurons, and may involve modulation of neuronal cell
function by viral or cellular products released from surrounding
infected cells. The human immunodeficiency virus type 1 (HIV-1)
trans-activator protein Tat may be one such factor, as it can act as a
neurotoxin, induces marked morphological changes in neurons and
astrocytes in primary embryonic rodent brain cultures, and is released
by certain HIV-1-infected cells. In addition, Tat can alter expression
of cellular genes in several non-neuronal cell types. To explore the
possibility that Tat may also mediate neuronal dysfunction in AIDS
through non-lethal effects on neurons, we determined the
trans-activating ability of Tat in human neuronal cells. We generated
human neuronal cell lines stably expressing several HIV-1 tat genes, and
also tested human neuronal cells exposed to extracellular recombinant
Tat protein. Both endogenously expressed Tat as well as exogenous
recombinant Tat protein up-regulated HIV-1 long terminal region
(LTR)-driven gene expression by several hundred-fold. Only brief
exposure to recombinant Tat was necessary and no toxic effects were seen
at levels sufficient for trans-activation. Furthermore, Tat
significantly enhanced virus expression in neuronal cells transfected
with molecular clones of HIV-1. These results show that Tat is
trans-activationally active in human neuronal cells, and can be taken up
from the extracellular compartment by these cells in a biologically
active form. Neurons represent an important potential target for
Tat-mediated cellular dysfunction.
DE *Gene Expression Regulation, Viral Gene Products,
tat/*GENETICS/*METABOLISM Human HIV Antigens/METABOLISM HIV Long
Terminal Repeat/GENETICS HIV-1/GROWTH &
DEVELOPMENT/*GENETICS/IMMUNOLOGY Neurons/*METABOLISM
Proviruses/GENETICS Support, Non-U.S. Gov't Support, U.S. Gov't,
P.H.S. *Trans-Activation (Genetics) Transfection Tumor Cells,
Cultured JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).