Abstract:
:Recent data suggest that initiation of signal transduction via type 1 Fc epsilon receptor (Fc epsilon RI) and other immunoreceptors is spatially constrained to lipid rafts. In order to better understand the complexity and function of these structures, we prepared mAb against lipid rafts from the rat basophilic leukemia cell line, RBL-2H3, which is extensively used for analysis of Fc epsilon RI-mediated activation. One of the antibodies was found to recognize a novel glycosylphosphatidylinositol-anchored plasma membrane glycoprotein of 250 amino acids, designated TEC-21, containing a cysteine-rich domain homologous to those found in the urokinase plasminogen activator receptor/Ly-6/snake neurotoxin family. TEC-21 is abundant on the surface of RBL-2H3 cells (>10 (6) molecules/cell), but is absent in numerous rat tissues except for testes. Aggregation of TEC-21 on RBL-2H3 cells induced a rapid increase in tyrosine phosphorylation of several substrates including Syk kinase and LAT adaptor, calcium flux, and release of secretory components. Similar but more profound activation events were observed in cells activated via Fc epsilon RI. However, aggregation of TEC-21 did not induce changes in density of IgE-Fc epsilon RI complexes, tyrosine phosphorylation of Fc epsilon RI beta and gamma subunits, and co-aggregation of Lyn kinase. TEC-21-induced activation events were also observed in Fc epsilon RI(-) mutants of RBL-2H3 cells. Thus, TEC-21 is a novel lipid raft component of RBL-2H3 cells whose aggregation induces activation independently of Fc epsilon RI.
journal_name
Int Immunoljournal_title
International immunologyauthors
Hálová I,Dráberová L,Dráber Pdoi
10.1093/intimm/14.2.213subject
Has Abstractpub_date
2002-02-01 00:00:00pages
213-23issue
2eissn
0953-8178issn
1460-2377journal_volume
14pub_type
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journal_title:International immunology
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journal_title:International immunology
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journal_title:International immunology
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journal_title:International immunology
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journal_title:International immunology
pub_type: 杂志文章,评审
doi:10.1093/intimm/dxm057
更新日期:2007-07-01 00:00:00
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更新日期:2009-09-01 00:00:00
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journal_title:International immunology
pub_type: 杂志文章
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更新日期:2009-10-01 00:00:00
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journal_title:International immunology
pub_type: 杂志文章,评审
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pub_type: 杂志文章
doi:10.1093/intimm/4.11.1303
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journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/dxq033
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journal_title:International immunology
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doi:10.1093/intimm/7.12.1905
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:International immunology
pub_type: 杂志文章
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更新日期:2003-06-01 00:00:00
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journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/4.11.1263
更新日期:1992-11-01 00:00:00