The laminin-binding activity of the alpha 7 integrin receptor is defined by developmentally regulated splicing in the extracellular domain.

The laminin-binding activity of the alpha 7 integrin receptor is defined by developmentally regulated splicing in the extracellular domain.
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α7 整联蛋白受体的层粘连蛋白结合活性由胞外域中发育调节的剪接定义。

DOI:
10.1091/mbc.8.9.1723
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发表时间:
1997
影响因子:
3.3
通讯作者:
Kramer,RH
Kramer,RH
中科院分区:
生物学3区
文献类型:
--
作者:
Ziober,BL;Chen,Y;Kramer,RH

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层粘连蛋白结合α 7 β 1整联蛋白的表达模式在骨骼肌、心肌和平滑肌中受到发育调节。α 7胞外结构域中的X1/X2选择性剪接存在于保守的α链同源重复结构域III和IV之间的可变区中,该位点涉及配体结合。为了评估X1/X2亚型活性的差异,我们产生了用α 7-X1/X2 cDNA转染的MCF-7细胞系。表达α 7-X2变体的转染子迅速粘附于层粘连蛋白1,而表达α 7-X1的转染子未能粘附。α 7-X1以非活性状态存在是在使用激活β 1抗体的测定中建立的,该抗体诱导X1依赖性细胞粘附和扩散。此外,α 7-X1的活化是细胞类型特异性的,并且当在HT 1080细胞中表达时,整合素转化为能够促进粘附的全功能受体。因此,α 7-X1/X2整联蛋白的表达是在细胞特异性环境中调节受体亲和力状态的新机制,并且可以在肌肉发育和修复期间调节整联蛋白依赖性事件。
The expression pattern of the laminin-binding alpha 7 beta 1 integrin is developmentally regulated in skeletal, cardiac, and smooth muscle. The X1/X2 alternative splicing in the extracellular domain of alpha 7 is found in the variable region between conserved alpha-chain homology repeat domains III and IV, a site implicated in ligand binding. To assess differences in X1/X2 isoform activity, we generated MCF-7 cell lines transfected with alpha 7-X1/X2 cDNAs. Transfectants expressing the alpha 7-X2 variant adhered rapidly to laminin 1, whereas those expressing alpha 7-X1 failed to attach. That alpha 7-X1 exists in an inactive state was established in assays using an activating beta 1 antibody that induced X1-dependent cell adhesion and spreading. Furthermore, the activation of alpha 7-X1 was cell type specific, and when expressed in HT1080 cells, the integrin was converted into a fully functional receptor capable of promoting adhesion. Thus, the expression of the alpha 7-X1/X2 integrin is a novel mechanism that regulates receptor affinity states in a cell-specific context and may modulate integrin-dependent events during muscle development and repair.
DOI: 10.1002/j.1460-2075.1990.tb08170.x
发表时间: 1990-03
期刊: The EMBO Journal
影响因子: --
作者:
'. ShintaroSuzuki;Y. Naitoh
通讯作者: '. ShintaroSuzuki;Y. Naitoh
DOI: 10.1073/pnas.86.14.5415
发表时间: 1989-07
影响因子: 11.1
作者:
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骨骼肌分化过程中 L-14 凝集素选择性调节 α 7 β 1 整合素与纤连蛋白和层粘连蛋白的相互作用
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发表时间: 1996
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: 10.1242/jcs.106.4.1139
发表时间: 1993
影响因子: 4
作者:
Song,WK;Wang,W;Sato,H;Bielser,DA;Kaufman,SJ
通讯作者: Kaufman,SJ