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
中科院分区:
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
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.
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影响因子:
4.4
作者:
R. C. Monteiro;Max D. Cooper;Hiromi Kubagawa
通讯作者:
R. C. Monteiro;Max D. Cooper;Hiromi Kubagawa
DOI:
--
发表时间:
1985
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Maliszewski,CR;Shen,L;Fanger,MW
通讯作者:
Fanger,MW
影响因子:
3.6
作者:
Fanger,MW;Lydyard,PM
通讯作者:
Lydyard,PM
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
DOI:
--
发表时间:
1986
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Jones,B;Tite,JP;JanewayJr,CA
通讯作者:
JanewayJr,CA