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M9490414.TXT
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1994-09-19
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Document 0414
DOCN M9490414
TI Induction of feline immunodeficiency virus-specific cytotoxic T cells in
vivo with carrier-free synthetic peptide.
DT 9411
AU Flynn JN; Cannon CA; Beatty JA; Mackett M; Rigby MA; Neil JC; Jarrett C;
Department of Veterinary Pathology, University of Glasgow,; Bearsden,
United Kingdom.
SO J Virol. 1994 Sep;68(9):5835-44. Unique Identifier : AIDSLINE
MED/94335100
AB The role of cellular immunity in the establishment and progression of
immunosuppressive lentivirus infection remains equivocal. To develop a
model system with which these aspects of the host immune response can be
studied experimentally, we examined the response of cats to a hybrid
peptide containing predicted T-and B-cell epitopes from the gag and env
genes of feline immunodeficiency virus (FIV). Cats were immunized with
an unmodified 17-residue peptide incorporating residues 196 to 208 (from
gag capsid protein p24) and 395 to 398 (from env glycoprotein gp120) of
the FIV Glasgow-8 strain by using Quil A as an adjuvant. Virus-specific
lymphocytotoxicity was measured by chromium-51 release assays. The
target cells were autologous or allogeneic skin fibroblasts either
infected with recombinant FIV gag vaccinia virus or pulsed with FIV
peptides. Effector cells were either fresh peripheral blood mononuclear
cells or T-cell lines stimulated with FIV peptides in vitro. Cytotoxic
effector cells from immunized cats lysed autologous, but not allogeneic,
target cells when they were either infected with recombinant FIV gag
vaccinia virus or pulsed with synthetic peptides comprising residues 196
to 205 or 200 to 208 plus 395. Depletion of CD8+ T cells, from the
effector cell population abrogated the lymphocytotoxicity. Immunized
cats developed an antibody response to the 17-residue peptide immunogen
and to recombinant p24. However, no antibodies which recognized smaller
constituent peptides could be detected. This response correlated with
peptide-induced T-cell proliferation in vitro. This study demonstrates
that cytotoxic T lymphocytes specific for FIV can be induced following
immunization with an unmodified short synthetic peptide and defines a
system in which the protective or pathological role of such responses
can be examined.
DE Amino Acid Sequence Animal Antibodies, Viral/IMMUNOLOGY Antigens,
CD8/ANALYSIS Cats Gene Products, gag/CHEMISTRY/*IMMUNOLOGY
Immunodeficiency Virus, Feline/*IMMUNOLOGY Lymphocyte Transformation
Molecular Sequence Data Peptides/*IMMUNOLOGY Support, Non-U.S. Gov't
T-Lymphocyte Subsets/IMMUNOLOGY T-Lymphocytes, Cytotoxic/*IMMUNOLOGY
Vaccines, Synthetic JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).