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M9630109.TXT
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1996-02-27
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Document 0109
DOCN M9630109
TI AKR.H-2b lymphocytes inhibit the secondary in vitro cytotoxic
T-lymphocyte response of primed responder cells to AKR/gross murine
leukemia virus-induced tumor cell stimulation.
DT 9603
AU Rich RF; Green WR; Department of Microbiology, Dartmouth Medical School,
Lebanon,; New Hampshire 03756, USA.
SO J Virol. 1996 Jan;70(1):402-14. Unique Identifier : AIDSLINE
MED/96099456
AB We have previously shown that AKR.H-2b congenic mice, though carrying
the responder H-2b major histocompatibility complex haplotype, are
unable to generate secondary cytolytic T-lymphocyte (CTL) responses
specific for AKR/Gross murine leukemia virus (MuLV). Our published work
has shown that this nonresponsive state is specific and not due to
clonal deletion or irreversible functional inactivation of antiviral CTL
precursors. In the present study, an alternative mechanism based on the
presence of inhibitory AKR.H-2b cells was examined. Irradiated or
mitomycin C-treated AKR.H-2b spleen cells function as in vitro
stimulator cells in the generation of C57BL/6 (B6) anti-AKR/Gross virus
CTL, consistent with their expression of viral antigens. In contrast,
untreated viable AKR.H-2b spleen cells functioned very poorly as
stimulators in vitro. Viable AKR.H-2b spleen cells were also able to
cause dramatic (up to > or = 25-fold) inhibition of antiviral CTL
responses stimulated in vitro by standard AKR/Gross MuLV-induced tumor
cells. This inhibition was specific: AKR.H-2b modulator spleen cells did
not inhibit allogeneic major histocompatibility complex-specific CTL
production, even when a concurrent antiviral CTL response in the same
culture well was inhibited by the modulator cells. These results and
those of experiments in which either semipermeable membranes were used
to separate AKR.H-2b modulator spleen cells from AKR/Gross MuLV-primed
responder cells or the direct transfer of supernatants from wells where
inhibition was demonstrated to wells where there was antiviral CTL
responsiveness argued against a role for soluble factors as the cause of
the inhibition. Rather, the inhibition was dependent on direct contact
of AKR.H-2b cells in a dose-dependent manner with the responder cell
population. Inhibition was shown not to be due to the ability of
AKR.H-2b cells to function as unlabeled competitive target cells.
Exogenous interleukin-2 added at the onset of the in vitro
CTL-generating cultures partially restored the antiviral response that
was decreased by AKR.H-2b spleen cells. Positive and negative cell
selection studies and the development of inhibitory cell lines indicated
that B lymphocytes and both CD4- CD8+ and CD4+ CD8- T lymphocytes from
AKR.H-2b mice could inhibit the generation of AKR/Gross virus-specific
CTL in vitro. AKR.H-2b macrophages were shown not to be required to
demonstrate AKR/Gross MuLV-specific inhibition, however, confirming that
the inhibition by T-cell (or B-cell)-depleted spleen populations was
dependent on the enriched B-cell (T-cell) population per se.(ABSTRACT
TRUNCATED AT 250 WORDS)
DE Animal Antibodies, Monoclonal/IMMUNOLOGY AKR Virus/*IMMUNOLOGY
B-Lymphocytes/IMMUNOLOGY/METABOLISM Cell Survival Cells, Cultured
CD4-Positive T-Lymphocytes/IMMUNOLOGY/METABOLISM CD8-Positive
T-Lymphocytes/IMMUNOLOGY/METABOLISM Female H-2 Antigens
Interleukin-2/PHARMACOLOGY Male Mice Mice, Inbred AKR Mice, Inbred
C57BL Mitomycin C/PHARMACOLOGY Spleen/CYTOLOGY/DRUG EFFECTS/RADIATION
EFFECTS Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S.
T-Lymphocytes, Cytotoxic/*IMMUNOLOGY/METABOLISM Tumor Cells, Cultured
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).