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首页> 外文期刊>Journal of Leukocyte Biology: An Official Publication of the Reticuloendothelial Society >Immune cell recruitment to inflammatory loci is impaired in mice deficient in basement membrane protein laminin ?±4
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Immune cell recruitment to inflammatory loci is impaired in mice deficient in basement membrane protein laminin ?±4

机译:缺乏基底膜蛋白层粘连蛋白α±4的小鼠的免疫细胞募集到炎性基因座受到损害

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For leukocytes to penetrate the vessel wall, they need to interact sequentially with the endothelial lining and the perivascular BM. The matrix protein laminin-411 is a major constituent of the vascular BM. The laminin ?±4 chain is a component of laminin-411 and has structural and signaling functions. Here, we addressed the role of BM laminin ?±4 in leukocyte recruitment to inflammatory loci. We used several recruitment models in Lam4a?’/a?’ and WT mice to determine whether lack of laminin-411 in the perivascular BM influences extravasation of inflammatory cells. Recruitment of all major leukocyte subsets (neutrophils, monocytes, and lymphocytes) was reduced in Lam4a?’/a?’ mice compared with WT. With the use of intravital microscopy, we concluded that this decrease was a result of impaired diapedesis through the vessel wall, as neither leukocyte adhesion to the endothelial lining nor migration in extravascular tissue was hampered in Lam4a?’/a?’ mice. Collectively, our data suggest a reduced ability of immune cells to penetrate the vessel wall in mice deficient in laminin ?±4.
机译:为了使白细胞穿透血管壁,它们需要与内皮层和血管周围BM相继相互作用。基质蛋白层粘连蛋白411是血管BM的主要成分。层粘连蛋白α±4链是层粘连蛋白411的组分,并具有结构和信号传导功能。在这里,我们讨论了BM层粘连蛋白α±4在白细胞募集到炎性基因座中的作用。我们在Lam4a?/ a?和WT小鼠中使用了几种募集模型,以确定血管周BM中缺乏层粘连蛋白411是否会影响炎症细胞的渗出。与WT相比,Lam4a?/ a?小鼠的所有主要白细胞亚群(中性粒细胞,单核细胞和淋巴细胞)的募集减少。使用活体显微镜检查,我们得出的结论是,这种减少是由于血管壁上的血透性受损,因为Lam4a?/ a?小鼠的白细胞对内皮细胞壁的粘附或血管外组织的迁移均未受到阻碍。总体而言,我们的数据表明,层粘连蛋白α±4不足的小鼠免疫细胞穿透血管壁的能力降低。

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