The role of STAT1 in activation of IL-3- and IL-5-induced eosinophils by interferon gamma.

Abstract:

:Tyrosine phosphorylation of STAT1alpha in eosinophils after IFN-gamma stimulation has been shown, but the biological significance of eosinophil STAT1alpha activation in transmitting the signals through the IFN-gamma receptor remains unknown. The purpose of this study is to determine whether STAT1 is involved in the regulation of eosinophils by IFN-gamma-IFN-gamma receptor interaction. rhIL-3- and rhIL-5-induced eosinophils from CD34+ cells of cord blood on day 28 of culture were used. The cells were washed and further incubated in IL-3- and IL-5-free medium for 48 h. The induced eosinophils constitutively expressed CD69 and lost this expression after a further 48-hour incubation without the cytokines. IFN-gamma significantly upregulated CD69 expression on the 48-hour incubated cells. In inhibitory experiments on STAT1, a phosphorothioate oligo antisense DNA against STAT1alpha was added to IL-3- and IL-5-containing medium from day 15 to day 28 of culture. The oligo DNAs altered neither the expressions of myeloid cell marker CD9 and 13 nor the expression of IFN-gamma receptor on the cells. The added STAT1alpha antisense, but not sense, DNA significantly reduced STAT1alpha mRNA expression in the cells. The STAT1 antisense also significantly inhibited IFN-gamma-induced CD69 expression on the 48-hour incubated eosinophils. In conclusion, these results indicate that IFN-gamma induces CD69 expression in the induced eosinophils through STAT1alpha, suggesting that STAT1alpha may play a significant role in eosinophil regulation by IFN-gamma.

authors

Ochiai K,Otaka K,Ito M,Tomioka H

doi

10.1159/000053722

keywords:

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

237-41

issue

1-3

eissn

1018-2438

issn

1423-0097

pii

53722

journal_volume

124

pub_type

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