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M94A3248.TXT
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1994-10-25
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Document 3248
DOCN M94A3248
TI Encounter of unprimed CD4+ T lymphocytes with HIV-1 gp120-expressing
cells results in lysis of both target and effector cells.
DT 9412
AU Jassoy C; Heinkelein M; Sopper S; Institute for Virology and
Immunobiology, Wurzburg University,; Germany.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):12 (abstract no. 020A). Unique
Identifier : AIDSLINE ICA10/94369327
AB OBJECTIVE: To examine the mechanism underlying the lysis of HIV-1 and
gp160 expressing cells by non-specific CD4+ T lymphocytes. METHODS: B
lymphoblastoid cells infected with recombinant vaccinia viruses
expressing HIV-1 gp 160 or control HIV-1 proteins and HIV-1-infected or
uninfected T cell lines were used as targets in chromium release assays.
Freshly prepared peripheral blood mononuclear cells (PBMC), CD4+ T
cell-enriched cultures, and CD4+ T cell clones derived from
HIV-1-infected and uninfected individuals were used as effectors. Lysis
of CD4+ effector cells and gp160 expressing target cells were determined
by radioactive labeling of both cell types in parallel assays. Cell
lysis and syncytium formation were determined in the presence and
absence of monoclonal antibodies (mAb) against CD4, soluble (s) CD4 and
other reagents. RESULTS: CD4+ T cell preparations from HIV-1-infected
and uninfected donors efficiently lysed gp 160 and HIV-1-expressing
cells. Lysis was HLA-unrestricted. In contrast to CD8+ CTL-mediated or
NK cell-mediated lysis, lysis was not inhibited by EDTA. In addition,
lysis was not inhibited by incubation with NK-sensitive cold targets or
by anti TNF-alpha mAb. Encounter of CD4+ T cells with HIV-1
gp160-expressing cells resulted in significant lysis of the uninfected
CD4+ cells. Both, lysis of CD4+ effector and gp 160-expressing target
cells could be inhibited by soluble CD4 and by mAb against CD4. Although
lysis of gp 160 expressing cells was observed with all CD4+ T cell
preparations used, syncytium formation was not detectable with certain
CD4+ T cell lines indicating that formation of syncytia was not required
for this type of lysis. CONCLUSION: Lysis of HIV-1-infected and
uninfected CD4+ T cells by these unique mechanisms could account for the
depletion of CD4+ cells in the infected individual.
DE Antibodies, Monoclonal/IMMUNOLOGY Cell Death Cell Line Edetic
Acid/PHARMACOLOGY Human *HIV Envelope Protein gp120 *HIV-1 Killer
Cells, Natural T-Lymphocytes,
Suppressor-Effector/*MICROBIOLOGY/PATHOLOGY Transfection T4
Lymphocytes/*MICROBIOLOGY/PATHOLOGY Vaccinia Virus MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).