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M9550830.TXT
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1995-03-25
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Document 0830
DOCN M9550830
TI Inhibition of Plasmodium falciparum growth in vitro by CD4+ and CD8+ T
cells from non-exposed donors.
DT 9505
AU Fell AH; Currier J; Good MF; Molecular Immunology Laboratory, Queensland
Institute of Medical; Research, Brisbane, Australia.
SO Parasite Immunol. 1994 Nov;16(11):579-86. Unique Identifier : AIDSLINE
MED/95166575
AB T cells from most adult non-exposed donors, which express a memory
phenotype (CD45RO+), can respond by proliferation to P. falciparum
asexual stages in vitro. Such cells may have arisen from exposure to
environmental organisms. To address the efficacy of such cells in
eliminating parasites and investigate the mechanisms involved, we have
used an in vitro assay where parasite growth can be precisely monitored
in the presence of different cell preparations. Unfractionated
peripheral blood mononuclear cells (PBMC) from both malaria-exposed and
non-exposed donors inhibited parasite growth by up to 62% in a two day
assay. Purified T cells in the presence of adherent cells had a similar
effect, but purified T cells alone or adherent cells alone had minimal
effect. Antigens released at the time of schizont rupture were maximally
effective in stimulating interferon-gamma (IFN gamma) production.
Neutralizing antibodies to IFN gamma showed a partial reduction of
growth inhibition in some individuals tested suggesting that different
mechanisms may be operative. Neutralizing antibody to TNF alpha had a
partial effect in combination with anti-IFN gamma. Antibodies to IL-1
and IL-4 had no effect. T cell fractionation experiments showed that
while purified CD4+ T cells from some donors produced IFN gamma and
inhibited parasite growth, purified CD8+ T cells could inhibit parasite
growth to a greater extent without production of detectable IFN
gamma.(ABSTRACT TRUNCATED AT 250 WORDS)
DE Adolescence Adult Aged Animal Antibodies/IMMUNOLOGY Antigens,
Protozoan Blood Donors Child Clone Cells Cytokines/IMMUNOLOGY
CD4-Positive T-Lymphocytes/*IMMUNOLOGY CD8-Positive
T-Lymphocytes/*IMMUNOLOGY Human Immunity, Cellular In Vitro
Leukocytes, Mononuclear/IMMUNOLOGY Malaria, Falciparum/IMMUNOLOGY
Middle Age Plasmodium falciparum/GROWTH & DEVELOPMENT/*IMMUNOLOGY
Rabbits Support, Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).