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Document 0089
DOCN M9650089
TI TCR-independent induction of low responsiveness by chemically fixed
cells in alloreactive CTL clones and its prevention through cognate
cell-cell interaction.
DT 9605
AU Lwin T; Nakashima I; Nagase F; Department of Immunology, Nagoya
University School of Medicine,; Aichi, Japan.
SO Microbiol Immunol. 1995;39(7):509-15. Unique Identifier : AIDSLINE
MED/96025421
AB We established BALB/c-derived CD8+ CTL clones D2-22 (V beta 6+), D2-23
(V beta 8+) and D2-24 (V beta 8+) specific for B10.D2 minor H antigen.
D2-22 and D2-23 proliferated without producing IL-2 in response to
X-ray-irradiated antigenic cells, Con A, aCD3, PMA and IL-2.
Paraformaldehyde-fixed antigenic spleen cells neither induced
proliferation in the presence of costimulatory cells nor inhibited
responses to irradiated antigenic cells added simultaneously. Unlike the
previously reported results with IL-2-producing CTL clones and Th1
clones, the fixed antigenic cells failed to induce antigen-specific
unresponsiveness in these IL-2-non-producing CTL clones. Instead, the
responsiveness of these clones to fresh stimulation was found to be
reduced severely after 2 days in the culture added with either antigenic
or syngeneic fixed cells. Induction of their antigen-nonspecific low
responsiveness by the fixed cells was prevented by adding irradiated
syngeneic cells into the culture or even by increasing the concentration
of responder D2-23 cells. Close contact of D2-23 and irradiated
syngeneic cells was required to prevent the reduction of the
responsiveness, although this cognate cell-cell interaction could be
replaced by exogenously added IL-2 or PMA. Cytolytic and tumor cell
growth inhibitory activities of D2-23 were also reduced by incubation
with the fixed cells, which was prevented by the addition of irradiated
syngeneic cells. These findings showed the unique properties of
IL-2-nonproducing CTL clones in signal requirements for maintaining
normal responsiveness for proliferation and cytolytic activity.
DE Animal Antigen-Presenting Cells/IMMUNOLOGY *Cell Communication/DRUG
EFFECTS/RADIATION EFFECTS Clone Cells Cytotoxicity, Immunologic
CD8-Positive T-Lymphocytes/DRUG EFFECTS/*IMMUNOLOGY/RADIATION EFFECTS
Fixatives Formaldehyde/PHARMACOLOGY Interleukin-2/BIOSYNTHESIS
Isoantigens/*IMMUNOLOGY Lymphocyte Transformation/IMMUNOLOGY Mice
Mice, Inbred BALB C Polymers/PHARMACOLOGY Receptors, Antigen,
T-Cell/*IMMUNOLOGY Spleen/CYTOLOGY T-Lymphocytes, Cytotoxic/DRUG
EFFECTS/*IMMUNOLOGY/RADIATION EFFECTS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).