Glucocorticoids preferentially upregulate functional CXCR4 expression in eosinophils.
Glucocorticoids preferentially upregulate functional CXCR4 expression in eosinophils.
复制标题
糖皮质激素优先上调嗜酸性粒细胞中的功能性 CXCR4 表达。
DOI:
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复制
发表时间:
2000
影响因子:
14.2
通讯作者:
Koichi Hirai
中科院分区:
文献类型:
--
作者:
H. Nagase;M. Miyamasu;Masao Yamaguchi;Hiroshi Kawasaki;Ken Ohta;Kazuhiko Yamamoto;Yutaka Morita;Koichi Hirai
BACKGROUND
Chemokines play an important role in accumulation of eosinophils at allergic inflammatory sites. Systemic administration of glucocorticoids (GCCs) attenuates tissue eosinophilia. In vivo chemokine actions are regulated at levels of both ligand production and receptor expression. The inhibitory effects of GCCs on the production of eosinophil-active chemokines, such as eotaxin, have been well established. However, no data exist regarding the effects of GCCs on expression of chemokine receptors in eosinophils per se.
OBJECTIVE
The objective of this study was to investigate the regulation of chemokine receptor expression in eosinophils by GCCs.
METHODS
Chemokine receptor expression was analyzed by using flow cytometry and reverse transcriptase PCR. Intracellular Ca(2+) influx and chemotaxis were also analyzed.
RESULTS
Eosinophil CCR3 expression was slightly downregulated by 24-hour treatment with dexamethasone (DEX). On the other hand, DEX-treated eosinophils showed markedly increased CXCR4 expression ( approximately 6 fold) in a time- and dose-dependent fashion. In contrast to eosinophils, CXCR4 expression in neutrophils was only marginally affected by DEX. In DEX-treated eosinophils, stromal cell-derived factor 1alpha, a natural ligand for CXCR4, induced a higher level of Ca(2+) influx and chemotaxis compared with untreated cells.
CONCLUSION
GCCs upregulate the expression of CXCR4 in eosinophils but not in neutrophils. Because stromal cell-derived factor 1alpha may play a role in baseline trafficking of eosinophils into extravascular tissues rather than recruiting them directly to inflammatory sites, upregulation of CXCR4 by GCCs may mediate the antiallergic property of these drugs by sequestering eosinophils from the circulation to extravascular tissues.
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DOI:
--
发表时间:
1990
期刊:
The American review of respiratory disease
影响因子:
--
作者:
Schleimer,RP
通讯作者:
Schleimer,RP
影响因子:
4.4
作者:
N. Wallen;H. Kita;D. Weiler;G. Gleich
通讯作者:
N. Wallen;H. Kita;D. Weiler;G. Gleich
影响因子:
15.9
作者:
Stellato, C;Collins, P;Schleimer, RP
通讯作者:
Schleimer, RP
DOI:
10.1164/ajrccm/138.2.406
发表时间:
1988-08-01
期刊:
AMERICAN REVIEW OF RESPIRATORY DISEASE
影响因子:
--
作者:
BASCOM, R;PIPKORN, U;NACLERIO, RM
通讯作者:
NACLERIO, RM
DOI:
--
发表时间:
1999
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Stellato,C;Matsukura,S;Fal,A;White,J;Beck,LA;Proud,D;Schleimer,RP
通讯作者:
Schleimer,RP