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M9550886.TXT
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1995-03-25
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Document 0886
DOCN M9550886
TI Cytotoxic T lymphocyte response to hepatitis C virus-derived peptides
containing the HLA A2.1 binding motif.
DT 9505
AU Cerny A; McHutchison JG; Pasquinelli C; Brown ME; Brothers MA;
Grabscheid B; Fowler P; Houghton M; Chisari FV; Scripps Research
Institute, La Jolla, California 92037.
SO J Clin Invest. 1995 Feb;95(2):521-30. Unique Identifier : AIDSLINE
MED/95164680
AB The HLA class I-restricted cytotoxic T lymphocyte (CTL) response is a
major defense mechanism in viral infections. It has been suggested that
the CTL response may contribute to viral clearance and liver cell injury
during hepatitis C virus (HCV) infection. To test this hypothesis
requires an understanding of the characteristics of HCV-specific
cytotoxic effector cells and identification of the target antigens to
which they respond. To begin this process we stimulated peripheral blood
mononuclear cells (PBMC) from a group of HLA-A2 positive patients with
chronic hepatitis C with a panel of 130 HCV-derived peptides containing
the HLA-A2 binding motif. Effector cells were tested for their capacity
to lyse HLA-A2-matched target cells that were either sensitized with
peptide or infected with a vaccinia virus construct containing HCV
sequences. Using this approach we have identified nine immunogenic
peptides in HCV, three of which are derived from the putative core
protein, three from the nonstructural (NS) 3 domain, two from NS4 and
one from NS5. Selected responses were shown to be HLA-A2 restricted,
mediated by CD8+ T cells and to recognize endogenously synthesized viral
antigen. Unexpectedly, peptide-specific CTL responses could also be
induced in sero-negative individuals, suggesting in vitro activation of
naive CTL precursors. The precursor frequency of peptide-specific CTL
was 10 to 100-fold higher in infected patients compared to uninfected
controls, and the responses were greatly diminished by removal of CD45
RO+ (memory) T cells. Further quantitative studies are clearly required
to establish whether a correlation exists between the HCV-specific CTL
response and the clinical course of this disease. Definition of the
molecular targets of the human CTL response to HCV creates this
opportunity, and may also contribute to the development of a T
cell-based HCV vaccine.
DE Amino Acid Sequence Antigens, CD45/IMMUNOLOGY Antigens,
Viral/BIOSYNTHESIS/*IMMUNOLOGY Binding Sites Clone Cells
Cytotoxicity, Immunologic CD8-Positive T-Lymphocytes/IMMUNOLOGY
Hepatitis C Viruses/*IMMUNOLOGY Human HLA-A2 Antigen/*IMMUNOLOGY
Lymphocyte Depletion Molecular Sequence Data Peptide
Fragments/IMMUNOLOGY Support, Non-U.S. Gov't Support, U.S. Gov't,
P.H.S. T-Lymphocytes, Cytotoxic/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).