Neutrophils sense flow-generated stress and direct their migration through αVβ3-integrin.

Neutrophils sense flow-generated stress and direct their migration through αVβ3-integrin.
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中性粒细胞感知血流产生的压力并通过 αVβ3-整合素引导其迁移。

DOI:
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发表时间:
1999
期刊:
American Journal of Physiology. Heart and Circulatory Physiology
影响因子:
--
通讯作者:
G. Nash
G. Nash
中科院分区:
--
文献类型:
--
作者:
G. Rainger;C. Buckley;D. Simmons;G. Nash

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在炎症过程中,嗜中性粒细胞从血液中募集到微血管内皮细胞的表面上。在这种情况下,血流不允许可溶性趋化梯度的存在。然而,中性粒细胞迁移到发生外渗的内皮细胞连接处仍然需要方向性线索。由流动血液产生的剪切力提供了潜在的替代引导。在我们的基于流动的粘附试验中,中性粒细胞在附着到血小板单层后被激活时优先沿流动方向迁移。用单克隆抗体中和αVβ3-整合素或关闭流动使迁移方向随机化,而不影响迁移速度。纯化的固定化αVβ3-整合素配体CD 31和纤连蛋白均能以浓度依赖性方式支持流动导向的中性粒细胞迁移。通过使用抗体或含Arg-Gly-Asp的肽中和αVβ3-整联蛋白与底物的相互作用,可以使迁移随机化。这些结果证实了通过整合素-配体相互作用的机械信号转导,并揭示了迄今为止在中性粒细胞中未知的引导系统。更一般地说,它证明了细胞可以使用整合素分子通过粘附来“采样”它们的物理微环境,并使用这些信息来调节它们的行为。
During inflammation neutrophils are recruited from the blood onto the surface of microvascular endothelial cells. In this milieu the presence of soluble chemotactic gradients is disallowed by blood flow. However, directional cues are still required for neutrophils to migrate to the junctions of endothelial cells where extravasation occurs. Shear forces generated by flowing blood provide a potential alternative guide. In our flow-based adhesion assay neutrophils preferentially migrated in the direction of flow when activated after attachment to platelet monolayers. Neutralizing αVβ3-integrin with monoclonal antibodies or turning the flow off randomized the direction of migration without affecting migration velocity. Purified, immobilized αVβ3-integrin ligands, CD31 and fibronectin, could both support flow-directed neutrophil migration in a concentration-dependent manner. Migration could be randomized by neutralizing αVβ3-integrin interactions with the substrate using antibodies or Arg-Gly-Asp-containing peptide. These results exemplify mechanical signal transduction through integrin-ligand interactions and reveal a guidance system that was hitherto unknown in neutrophils. In more general terms, it demonstrates that cells can use integrin molecules to "sample" their physical microenvironment through adhesion and use this information to modulate their behavior.
通过显微电影摄影研究人类中性粒细胞对趋化三肽(N-甲酰基-甲硫氨酰-亮氨酰-苯丙氨酸)的反应。
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