Glucocorticoids preferentially upregulate functional CXCR4 expression in eosinophils.

Glucocorticoids preferentially upregulate functional CXCR4 expression in eosinophils.
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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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发表时间:
2000
影响因子:
14.2
通讯作者:
Koichi Hirai
Koichi Hirai
中科院分区:
医学1区
文献类型:
--
作者:
H. Nagase;M. Miyamasu;Masao Yamaguchi;Hiroshi Kawasaki;Ken Ohta;Kazuhiko Yamamoto;Yutaka Morita;Koichi Hirai

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背景 趋化因子在嗜酸性粒细胞在变应性炎症部位的聚集中起重要作用。糖皮质激素(GCCs)的全身给药减弱组织嗜酸性粒细胞增多。体内趋化因子的作用在配体产生和受体表达水平上受到调节。GCC对嗜酸性粒细胞活性趋化因子(如嗜酸性粒细胞趋化因子)的抑制作用已得到充分证实。然而,没有关于GCC对嗜酸性粒细胞本身中趋化因子受体表达的影响的数据。 目的 本研究的目的是探讨GCCs对嗜酸性粒细胞趋化因子受体表达的调节作用。 方法 用流式细胞术和逆转录PCR分析趋化因子受体的表达。同时分析细胞内Ca(2+)内流和趋化性。 结果 地塞米松(DEX)治疗24小时后,嗜酸性粒细胞CCR3表达略有下调。另一方面,DEX处理的嗜酸性粒细胞显示CXCR4表达以时间和剂量依赖性方式显著增加(约6倍)。与嗜酸性粒细胞相反,中性粒细胞中的CXCR4表达仅受到DEX的轻微影响。在DEX处理的嗜酸性粒细胞中,与未处理的细胞相比,基质细胞衍生因子1 α(CXCR4的天然配体)诱导了更高水平的Ca(2+)内流和趋化性。 结论 GCC上调嗜酸性粒细胞中CXCR 4的表达,但不上调中性粒细胞中CXCR 4的表达。由于基质细胞衍生因子1 α可能在嗜酸性粒细胞向血管外组织的基线运输中发挥作用,而不是将其直接招募到炎症部位,因此GCC上调CXCR4可能通过将嗜酸性粒细胞从循环中隔离到血管外组织来介导这些药物的抗过敏特性。
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.
糖皮质激素对炎症细胞的影响与其在哮喘中的治疗应用相关。
DOI: --
发表时间: 1990
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影响因子: --
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发表时间: 1988-08-01
期刊: AMERICAN REVIEW OF RESPIRATORY DISEASE
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IL-4 和糖皮质激素布地奈德对上皮源性 C-C 趋化因子表达的差异调节。
DOI: --
发表时间: 1999
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
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通讯作者: Schleimer,RP