The ins and outs of leukocyte integrin signaling.

The ins and outs of leukocyte integrin signaling.
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DOI:
10.1146/annurev.immunol.021908.132554
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发表时间:
2009
影响因子:
29.7
通讯作者:
Lowell CA
Lowell CA
中科院分区:
医学1区
文献类型:
--
作者:
Abram CL;Lowell CA

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整合素是介导免疫系统中白细胞迁移和激活的主要细胞粘附受体。这些受体通过质膜以被称为“从内到外”和“从外到内”信号传导的途径双向发出信号。这些途径中的每一个都是由整合素结构的构象变化介导的。这种变化允许受体与血管内皮或细胞外基质上的反粘附分子高亲和力结合,并导致整合素的细胞质尾部与细胞内信号分子的结合。由外向内信号传导引起的白细胞功能反应包括迁移、增殖、细胞因子分泌和脱颗粒。在这里,我们回顾了由内而外与由外而内途径中发生的关键信号事件,强调了我们在理解整合素如何被各种刺激激活以及它们如何介导多种细胞反应方面的最新进展。
Integrins are the principle cell adhesion receptors that mediate leukocyte migration and activation in the immune system. These receptors signal bidirectionally through the plasma membrane in pathways referred to as “inside-out” and “outside-in” signaling. Each of these pathways is mediated by conformational changes to the integrin structure. Such changes allow high affinity binding of the receptor with counter-adhesion molecules on the vascular endothelium or extracellular matrix, and lead to association of the cytoplasmic tails of the integrins with intracellular signaling molecules. Leukocyte functional responses resulting from outside-in signaling include migration, proliferation, cytokine secretion and degranulation. Here we review the key signaling events that occur in the inside-out versus outside-in pathways, highlighting recent advances in our understanding of how integrins are activated by a variety of stimuli and how they mediate a diverse array of cellular responses.
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