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M9630111.TXT
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1996-02-27
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Document 0111
DOCN M9630111
TI Differing T-cell requirements for recombinant retrovirus vaccines.
DT 9603
AU Hasenkrug KJ; Brooks DM; Nishio J; Chesebro B; Laboratory of Persistent
Viral Diseases, Rocky Mountain; Laboratories, Hamilton, Montana 59840,
USA.
SO J Virol. 1996 Jan;70(1):368-72. Unique Identifier : AIDSLINE
MED/96099452
AB Friend murine leukemia virus is a retrovirus complex that induces rapid
erythroleukemia and immunosuppression in susceptible strains of adult
mice. Using this model, we directly examined the T-cell subsets required
for a protective retrovirus vaccine. Paradoxically, recovery in mice
immunized with a chimeric envelope containing only T-helper (TH) and
B-cell epitopes was dependent on CD8+ T cells as well as CD4+ T cells
despite the fact that the vaccine contained no CD8+ cytolytic
T-lymphocyte (CTL) epitopes. However, the requirement for CD8+ T cells
was overcome by inclusion of additional TH and B-cell epitopes in the
immunizing protein. These additional epitopes primed for more rapid
production of virus-neutralizing antibody which appeared to limit virus
spread sufficiently to protect even in the absence of CD8+ T cells.
Inclusion of an immunodominant CTL epitope in the vaccine was not
sufficient to overcome dependence on CD4+ T cells. These data suggest
that TH priming is more critical for retrovirus immunity than CTL
priming.
DE Amino Acid Sequence Animal Antigens, Viral/*IMMUNOLOGY Chimeric
Proteins/IMMUNOLOGY CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
T-Lymphocytes/IMMUNOLOGY Epitopes/ANALYSIS Female Friend
Virus/*IMMUNOLOGY Lymphocyte Depletion Male Mice Molecular Sequence
Data T-Lymphocyte Subsets/*IMMUNOLOGY/METABOLISM T-Lymphocytes,
Cytotoxic/IMMUNOLOGY Vaccination Viral Envelope
Proteins/GENETICS/IMMUNOLOGY Viral Vaccines/*IMMUNOLOGY JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).