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Frequency of Valpha24+CD161+ natural killer T cells and invariant TCRAV24-AJ18 transcripts in atopic and non-atopic individuals.

Abstract：

:Th2 cells play a central role in type I allergies. However, the source of interleukin-4 which may lead to a Th1/Th2 imbalance is unknown. Valpha24+CD161+ Natural killer T (NKT) cells secrete high amounts of interleukin-4 and/or interferon-gamma and are assumed to participate in the initiation of Th1/Th2 immune responses. Their contribution to the development of Th2-dependent type I allergies is controversial. Our objective in this paper was to determine whether Valpha24+CD161+ NKT cells differ in atopic and non-atopic adults. Venous blood was obtained from thirteen atopic and sixteen healthy adult probands. Valpha24+CD161+ NKT cells were determined in CD4+, CD8(bright/dim) and CD4-CD8- lymphocytes by flow cytometry. At the molecular level, the amounts of T cell receptor (TCR) AV24-AJ18 transcripts were quantified with respect to TCRAV24 chain transcripts alone or to all TCR alpha chain transcripts. To detect potential inserted nucleotides in the N-region, a novel real-time PCR-based technology was applied. Both CD4+ and CD4-CD8- NKT cells were present at higher frequencies than CD8+ NKT cells in all probands. CD8(dim) NKT cell levels were lower in healthy individuals, although not statistically significantly different to the patients. Amounts of AV24-AJ18 transcripts in relation to total TCR alpha-chains and to TCRAV24 alone were equal in both proband groups. N-region diversity was detected in four clones from four different individuals, but altered the amino acid sequence in only one clone of an atopic donor. Analysis of Valpha24+CD161+ NKT cell frequencies at both the cellular and molecular levels failed to reveal significant differences in peripheral blood of atopic and non-atopic probands. If NKT cells contribute to development of type I allergies they must do so at earlier times or in other locations.

journal_name

Immunobiology

journal_title

Immunobiology

authors

Prell C,Konstantopoulos N,Heinzelmann B,Frankenberger B,Reinhardt D,Schendel DJ,Krauss-Etschmann S

doi

10.1078/0171-2985-00284

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

367-80

issue

4

eissn

0171-2985

issn

1878-3279

pii

S0171-2985(04)70227-2

journal_volume

208

pub_type

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