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M9650326.TXT
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1996-03-09
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Document 0326
DOCN M9650326
TI HIV-1 Tat modulates invasion by a bacterial enteric pathogen into a
human intestinal cell line.
DT 9605
AU Mayer HB; Wanke CA; Du B; Hammer SM; Terwilliger EF; Division of
Infectious Diseases, New England Deaconess Hospital,; Boston, MA 02115,
USA.
SO AIDS. 1995 Nov;9(11):1237-42. Unique Identifier : AIDSLINE MED/96126177
AB OBJECTIVE: To explore the possibility that an HIV-1 gene product may
modulate entry of an invasive enteric pathogen into a terminally
differentiated human intestinal cell line. HIV-1 Tat was selected for
investigation because of its unique ability to cross cell membranes.
METHODS: After transient transfection of HT29-C1 cells with plasmids
containing HIV-1 long terminal repeat (LTR)-lacZ plus a Tat expression
cassette, or with a pSR-lacZ control plasmid, bacterial invasion assays
were performed on both groups of cells utilizing a clinical Salmonella
isolate. Assays were performed concurrently on a control group of
non-transfected cells. A second series of experiments compared bacterial
invasion into cells transfected with the Tat expression vector alone
versus cells transfected with either an isogenic expression vector that
did not make Tat, or with pSR-lacZ. Finally, the ability of exogenous
Tat protein to transactivate an HIV-1 LTR-chloramphenicol
acetyltransferase (CAT) plasmid which had been transfected into HT29-C1
cells and to modulate Salmonella invasion was also assessed. RESULTS:
HT29-C1 cells transfected with a Tat expression vector, either alone or
in combination with another plasmid, were significantly less susceptible
to bacterial invasion than cells that either did not undergo
transfection, were transfected with an otherwise isogenic expression
vector without Tat, or transfected with an unrelated plasmid. Duplicate
experiments also demonstrated that exogenous purified Tat protein
transactivated an HIV-1 LTR-CAT plasmid which had been transfected into
HT29-C1 cells and inhibited Salmonella invasion compared with unexposed
cells. CONCLUSION: HIV-1 Tat inhibits Salmonella invasion of a human
enterocyte cell line whether the protein is expressed intracellularly or
provided exogenously.
DE Animal Cell Line Chloramphenicol Acetyltransferase/METABOLISM Enzyme
Activation Gene Products, tat/*BIOSYNTHESIS/GENETICS Gene Transfer
Human *HIV-1 Intestines/METABOLISM/*MICROBIOLOGY/VIROLOGY
Salmonella/*PATHOGENICITY Support, Non-U.S. Gov't Support, U.S. Gov't,
P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).