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M9650430.TXT
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1996-03-09
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Document 0430
DOCN M9650430
TI Abnormal thymocyte subset distribution and differential reduction of
CD4+ and CD8+ T cell subsets during peripheral maturation in
diabetes-prone BioBreeding rats.
DT 9605
AU Groen H; Klatter FA; Brons NH; Mesander G; Nieuwenhuis P; Kampinga J;
Department of Histology and Cell Biology, University of; Groningen, The
Netherlands.
SO J Immunol. 1996 Feb 1;156(3):1269-75. Unique Identifier : AIDSLINE
MED/96144354
AB In this study we quantified CD8+ and CD4+ T cells in T lymphocytopenic
BB rats as compared with control rats at given stages along the
maturational pathway from immature thymocytes to mature peripheral T
cells. Our results show that BB rats exhibit abnormal thymocyte subset
distribution. Numbers of mature TCRhigh/CD4-8+ thymocytes, and also
their TCRhigh/CD4+8+ precursors were decreased, as were levels of CD8
expression on all thymocyte subsets investigated. By analogy with mouse
thymocyte development, these findings suggest a decreased efficiency for
positive selection of CD8 precursors in BB rats. Furthermore, as related
to the number of available mature TCRhigh single positive thymocytes,
numbers of CD4+ and CD8+ T cells most recently migrated from the thymus
were severely decreased in BB blood, indicating either reduced thymic
output or rapid cell death after migration. Subsequently, in peripheral
blood and cervical lymph nodes, a 95% decrease of CD8+ and a 50 to 80%
decrease of CD4+ T cells were demonstrated upon maturation from recent
thymic migrants to mature peripheral T cells, leaving the BB rat with a
severely reduced T cell population, consisting of CD4+ T cells and a
minute population of CD8+ T cells. The vast majority of the latter was
found to have an immature peripheral phenotype. Possible consequences of
our findings for the generation of autoreactive CD8+ T cells are
discussed.
DE Age Factors Animal Antigens, CD8/BIOSYNTHESIS Antigens,
Thy-1/BIOSYNTHESIS Cell Differentiation/IMMUNOLOGY Cell
Movement/IMMUNOLOGY CD4-Positive T-Lymphocytes/*IMMUNOLOGY
CD8-Positive T-Lymphocytes/*IMMUNOLOGY Diabetes Mellitus,
Insulin-Dependent/*IMMUNOLOGY Lymph Nodes/CYTOLOGY Lymphocyte Count
Lymphopenia/*IMMUNOLOGY/PATHOLOGY Male Rats Rats, Inbred BB Rats,
Inbred Strains Receptors, Antigen, T-Cell/BIOSYNTHESIS Support,
Non-U.S. Gov't Thymus Gland/*CYTOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).