Size‐dependent effect of IgA on the IgA Fc receptor (CD89)

Size‐dependent effect of IgA on the IgA Fc receptor (CD89)
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IgA 对 IgA Fc 受体 (CD89) 的大小依赖性影响

DOI:
10.1002/eji.1830270915
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发表时间:
1997
影响因子:
5.4
通讯作者:
M. Daha
M. Daha
中科院分区:
医学3区
文献类型:
--
作者:
T. Reterink;G. van Zandbergen;M. van Egmond;N. Klar‐Mohamad;Craig H. Morton;J. V. D. van de Winkel;M. Daha

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IgA Fc受体(FcR; CD89)在骨髓细胞系的几种类型的细胞中表达。我们研究了不同大小的热聚集IgA (aIgA)是否与CD89结合并随后诱导细胞活化。作为模型,我们使用转染CD89的小鼠B细胞系IIA1.6或转染CD89的IIA1.6细胞以及FcR γ链来研究IgA与CD89的结合。当这些表达CD89的细胞与单体IgA孵育时,荧光活化细胞分选分析未检测到IgA与细胞的明显结合;然而,与聚集的IgA细胞孵育的结果是93±2%的阳性细胞。不同大小的含IgA聚集体的细胞孵育显示,与每个聚集体含有5 - 6个IgA分子的聚集体结合最佳。含有IgA1 -或IgA2 -的聚集体与CD89的结合没有差异。此外,发现aIgA的结合是CD89特异性的,因为IgA的结合被CD89特异性单克隆抗体My43完全抑制,并且没有检测到与IIA1.6亲本细胞系的结合。利用白细胞介素- 2 (IL - 2)生成作为标记的激活研究表明,FcR γ链是诱导细胞激活所必需的。只有同时转染了CD89和FcR γ链(CD89+/γ+)的细胞,在IgA聚集刺激下,IL - 2的产生增加了10-12倍。此外,在共表达FcR γ链的细胞中,CD89的触发仅导致细胞内钙浓度([Ca2+]i)的增加。FcR γ链免疫受体酪氨酸激活基元中酪氨酸残基的突变消除了[Ca2+]i的增加,表明FcR γ链与CD89介导的信号传导相关并参与其中。
The IgA Fc receptor (FcR; CD89) is expressed on several types of cells of the myeloid cell lineage. We investigated whether different sizes of heat‐aggregated IgA (aIgA) bind to CD89 and subsequently induce cellular activation. As a model we used the murine B cell line IIA1.6 transfected with CD89 or IIA1.6 cells transfected with CD89 as well as with the FcR γ chain to study the binding of IgA to CD89. When these cells expressing CD89 were incubated with monomeric IgA, no significant binding of IgA to the cells was detectable by fluorescence‐activated cell sorter analysis; however, incubation of the cells with aggregated IgA resulted in 93 ± 2% positive cells. Incubation of the cells with different sizes of IgA‐containing aggregates revealed optimal binding with aggregates containing five to six molecules of IgA per aggregate. No difference was observed between the binding to CD89 of both IgA1‐ or IgA2‐containing aggregates. Furthermore, the binding of aIgA was found to be CD89‐specific, since the binding of IgA was completely inhibited by the CD89‐specific monoclonal antibody My43 and no detectable binding occurred to the IIA1.6 parent cell line. Activation studies using interleukin‐2 (IL‐2) production as a marker, showed that the FcR γ chain is necessary to induce cellular activation. Only cells transfected with both CD89 and the FcR γ chain (CD89+/γ+) enhance the IL‐2 production 10–12‐fold upon stimulation with aggregates of IgA. Furthermore, triggering of CD89 only results in increase of intracellular calcium concentration ([Ca2+]i) in cells co‐expressing FcR γ chain. Mutation of the tyrosine residues in the FcR γ chain immunoreceptor tyrosine‐based activation motif of the FcR γ chain abolishes this increase in [Ca2+]i, indicating association and involvement of the FcR γ chain in CD89‐mediated signaling.
DOI: 10.4049/jimmunol.148.6.1764
发表时间: 1992-03
影响因子: 4.4
作者:
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DOI: --
发表时间: 1985
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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发表时间: 1981
影响因子: 3.6
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DOI: --
发表时间: 1994
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Pfefferkorn,LC;Yeaman,GR
通讯作者: Yeaman,GR
小鼠 B 细胞肿瘤 A20/2J 的不同表型变体是通过 L3T4 阳性、I-A 限制性 T 细胞克隆的抗原和丝裂原触发的细胞毒性来选择的。
DOI: --
发表时间: 1986
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
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