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1996-02-26
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Document 0526
DOCN M9620526
TI CD8highCD57+ T lymphocytes in normal, healthy individuals are
oligoclonal and respond to human cytomegalovirus.
DT 9602
AU Wang EC; Moss PA; Frodsham P; Lehner PJ; Bell JI; Borysiewicz LK;
Department of Medicine, University of Wales College of Medicine,; Health
Hospital, Cardiff, United Kingdom.
SO J Immunol. 1995 Nov 15;155(10):5046-56. Unique Identifier : AIDSLINE
GENBANK/Z50839
AB CD8+CD57+ lymphocytes from normal peripheral blood are divided into T
cells expressing high levels of CD8 and NK cells expressing low levels
of surface CD8. Increased numbers of CD8highCD57+ T cells correlate with
previous exposure to human cytomegalovirus (HCMV) infection, but no
virus-specific function or function for CD8highCD57+ cells has been
recorded. We have studied the TCR repertoire and responses of the
CD8highCD57+ population induced by virus-infected fibroblasts in healthy
individuals. Using three-color flow cytometry of PBL, we detected
restricted TCRBV usage in the CD8highCD57+ subset of 11/15 subjects,
compared with 1/15 in the CD8+, CD57- subset. The results of anchored
PCR and sequencing also showed oligoclonality of TCR; 40-70% of
CD8highCD57+ lymphocytes (10-20% of total CD8+ T cells) were derived
from single clones. Such expansions were stable with time and detected
in one subject over a 2-yr period. Functionally, CD8highCD57+
lymphocytes proliferated strongly to HCMV-, but not HSV-, VZV-, or
influenza-infected fibroblasts in an MHC-unrestricted manner in vitro,
including preferential augmentation of particular in vivo oligoclonally
expanded subpopulations. HCMV-specific MHC-restricted CTL were detected,
but limiting dilution analysis showed that these were a minority (< 10%)
and not the oligoclonal subsets. In contrast, depletion of oligoclonally
expanded CD8highCD57+ subpopulations, resulted in the increase of
HCMV-specific CTL, suggesting functional heterogeneity in these cells.
DE Adult Amino Acid Sequence Antigens, CD57/*IMMUNOLOGY Base Sequence
Cells, Cultured Clone Cells Cytomegalovirus/*IMMUNOLOGY
Cytomegalovirus Infections/*IMMUNOLOGY CD8-Positive
T-Lymphocytes/CYTOLOGY/*IMMUNOLOGY/*VIROLOGY Human Middle Age
Molecular Sequence Data Receptors, Antigen, T-Cell/GENETICS/*IMMUNOLOGY
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).