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J. Virol., Feb 1996, 843-851, Vol 70, No. 2
U Utz, D Banks, S Jacobson and WE Biddison
Human T-cell leukemia virus type 1 (HTLV-1)-associated myelopathy/tropical
spastic paraparesis (HAM/TSP) is a chronic, progressive neurological
disease characterized by marked degeneration of the spinal cord and the
presence of antibodies against HTLV-1. Patients with HAM/TSP, but not
asymptomatic carriers, show very high precursor frequencies of
HTLV-1-specific CD8+ T cells in peripheral blood and cerebrospinal fluid,
suggestive of a role of these T cells in the pathogenesis of the disease.
In HLA-A2+ HAM/TSP patients, HTLV-1- specific T cells were demonstrated to
be directed predominantly against one HTLV-1 epitope, namely, Tax11-19. In
the present study, we analyzed HLA-A2-restricted HTLV-1 Tax11-19-specific
cytotoxic T cells from three patients with HAM/TSP. An analysis of the
T-cell receptor (TCR) repertoire of these cells revealed an absence of
restricted variable (V) region usage. Different combinations of TCR V alpha
and V beta genes were utilized between, but also within, the individual
patients for the recognition of Tax11-19. Sequence analysis of the TCR
showed evidence for an oligoclonal expansion of few founder T cells in each
patient. Apparent structural motifs were identified for the CDR3 regions of
the TCR beta chains. One T-cell clone could be detected within the same
patient over a period of 3 years. We suggest that these in vivo clonally
expanded T cells might play a role in the pathogenesis of HAM/TSP and
provide information on HTLV-1-specific TCR which may elucidate the nature
of the T cells that infiltrate the central nervous system in HAM/TSP
patients.
Copyright © 1996, American Society for Microbiology
Analysis of the T-cell receptor repertoire of human T-cell leukemia virus type 1 (HTLV-1) Tax-specific CD8+ cytotoxic T lymphocytes from patients with HTLV-1-associated disease: evidence for oligoclonal expansion
Institut de recherches cliniques de Montreal, Laboratoire d'Immunologie, Montreal, Canada.
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