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1996-02-26
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Document 0627
DOCN M9620627
TI Aberrant activation of CD8+ T-cell and CD8+ T-cell subsets in patients
with newly diagnosed IDDM.
DT 9602
AU Hehmke B; Michaelis D; Gens E; Laube F; Kohnert KD; Department of
Experimental and Clinical Endocrinology, University; of Greifswald,
Karlsburg, Germany.
SO Diabetes. 1995 Dec;44(12):1414-9. Unique Identifier : AIDSLINE
MED/96082212
AB Two- and three-color cytofluorimetric techniques were used to study the
expression patterns of the activation antigen HLA-DR on peripheral blood
immunoregulatory T-cells from 25 patients with newly diagnosed
insulin-dependent diabetes mellitus (IDDM) and 14 age- and sex-matched
control subjects. The mean percentage of total activated (CD3+HLA-DR+)
T-cells was significantly elevated in the IDDM group compared with the
control group (P < 0.001). In control subjects, basal activation of CD4+
and CD8+ lymphocytes accounted for the low percentage levels of
activated T-cells. In contrast, the majority of IDDM patients showed an
unbalanced activation of CD4+ and CD8+ lymphocytes with predominant
activation of the CD8+ lymphocyte subset. The composition of the
activated T-cell fraction was dependent on the composition of the total
(activated + nonactivated) T-cell population, as indicated by the
positive correlation between the CD4+/CD8+ T-cell ratios in these two
cell populations (r = 0.714; P < 0.001). Excessive activation of CD8+
T-cells was attributable to similar increases in the proportions of CD8+
CD45RA+HLA-DR+ (naive) and CD8+CD45RA-HLA-DR+ (memory) cells. Analysis
of the CD11b-defined subsets revealed predominant activation of CD8+
CD11b- (cytotoxic) T-cells; CD8+ CD16+ HLA-DR+ natural killer cells were
unchanged. The distribution of HLA-DR+ cells among subsets of CD4+
T-cells differed from the pattern in the CD8+ population in that
selective activation of CD4+ CD45RA- (memory, helper-inducer) cells
accounted for the small increase in activated CD4+ cells.(ABSTRACT
TRUNCATED AT 250 WORDS)
DE Adolescence Adult Antigens, CD3/ANALYSIS Autoantibodies/BLOOD Child
CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
T-Lymphocytes/*IMMUNOLOGY Diabetes Mellitus,
Insulin-Dependent/*IMMUNOLOGY Female Flow Cytometry Human HLA-DR
Antigens/ANALYSIS Islets of Langerhans/IMMUNOLOGY Killer Cells,
Natural/IMMUNOLOGY *Lymphocyte Transformation Male 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).