Subsecond induction of alpha4 integrin clustering by immobilized chemokines stimulates leukocyte tethering and rolling on endothelial vascular cell adhesion molecule 1 under flow conditions.

Subsecond induction of alpha4 integrin clustering by immobilized chemokines stimulates leukocyte tethering and rolling on endothelial vascular cell adhesion molecule 1 under flow conditions.
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在流动条件下,固定趋化因子诱导α4整联蛋白聚类刺激白细胞绑扎和滚动在内皮血管细胞粘附分子上1。

DOI:
10.1084/jem.192.4.495
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发表时间:
2000-08-21
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Alon R
Alon R
中科院分区:
其他
文献类型:
--
作者:
Grabovsky V;Feigelson S;Chen C;Bleijs DA;Peled A;Cinamon G;Baleux F;Arenzana-Seisdedos F;Lapidot T;van Kooyk Y;Lobb RR;Alon R

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Leukocyte recruitment to target tissue is initiated by weak rolling attachments to vessel wall ligands followed by firm integrin-dependent arrest triggered by endothelial chemokines. We show here that immobilized chemokines can augment not only arrest but also earlier integrin-mediated capture (tethering) of lymphocytes on inflamed endothelium. Furthermore, when presented in juxtaposition to vascular cell adhesion molecule 1 (VCAM-1), the endothelial ligand for the integrin very late antigen 4 (VLA-4, α4β1), chemokines rapidly augment reversible lymphocyte tethering and rolling adhesions on VCAM-1. Chemokines potentiate VLA-4 tethering within <0.1 s of contact through Gi protein signaling, the fastest inside-out integrin signaling events reported to date. Although VLA-4 affinity is not altered upon chemokine signaling, subsecond VLA-4 clustering at the leukocyte-substrate contact zone results in enhanced leukocyte avidity to VCAM-1. Endothelial chemokines thus regulate all steps in adhesive cascades that control leukocyte recruitment at specific vascular beds.
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