Abstract:
:Atopic disorders are caused by disregulated activation of T helper 2 (Th2) cells that produce IL-4 and IL-5. Because the presence of IL-4 potently augments the differentiation of naive T cells into Th2 cells, it is important to seek the cell population which provides IL-4 for naive T cells. Recently, a unique subpopulation of T cells, natural killer (NK) T cells, has been shown to produce a large amount of IL-4 upon activation, suggesting their regulatory role in initiation of Th2 cell differentiation. To determine whether NK T cells play a regulatory role in human Th2 cell-mediated atopic diseases, we analysed the frequency of invariant Valpha24JalphaQ CD4-CD8- double-negative (DN) T cells, human NK T cells, in patients with atopic asthma and atopic dermatitis. We also studied cytokine production from Valpha24+ Vbeta11+ DN T cells, which comprise most of Valpha24JalphaQ DN T cells. We found that the invariant Valpha24JalphaQ DN T cells were greatly diminished in patients with asthma and atopic dermatitis. On the other hand, there was no significant difference in Valpha24+ CD4+ T cells possessing invariant Valpha24JalphaQ TCR between healthy subjects and atopic patients. We also found that Valpha24+ Vbeta11+ DN T cells from healthy subjects predominantly produced interferon-gamma (IFN-gamma) but not IL-4 upon activation. These results suggest that NK T cells may not be essential for human atopic disease and that the disappearance of NK T cells, most of which produce IFN-gamma, may be involved in the pathogenesis of atopic diseases.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Oishi Y,Sakamoto A,Kurasawa K,Nakajima H,Nakao A,Nakagawa N,Tanabe E,Saito Y,Iwamoto Idoi
10.1046/j.1365-2249.2000.01157.xsubject
Has Abstractpub_date
2000-03-01 00:00:00pages
404-11issue
3eissn
0009-9104issn
1365-2249pii
cei1157journal_volume
119pub_type
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