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Accessibility to the Fibronectin Synergy Site in a 3D Matrix Regulates Engagement of 5β 1 versus vβ 3 Integrin Receptors

机译:在3D矩阵中对纤连蛋白协同作用位点的可及性调节5β1与vβ3整联蛋白受体的结合。

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Cell adhesion and migration on fibronectin (FN) extracellular matrix are mediated by integrin receptors. Integrins 5β 1 and vβ 3 require the RGD cell-binding sequence in FN, but 5β 1 also requires the nearby synergy site for maximal binding. In this study, we investigated how differences in the numbers of RGD or synergy sites within a three-dimensional (3D) FN-rich matrix influence cell adhesion and migration. CHO cell adhesion, spreading, and migration were reduced on 3D chimeric matrix containing FN lacking RGD (FN(RGD-)). Incorporation of FN with mutation of the synergy site (FN(syn-)), however, resulted in selective usage of integrins. CHO cells expressing 5β 1 showed decreased interactions with FN(syn-) chimeric matrix. In contrast, the presence of FN(syn-) had no effect on CHO vβ 3 cell migration. Interestingly, CHO 5/ vβ 3 cells expressing both integrins selectively used 5β 1 for migration on wild type FN matrix but preferred vβ 3 for migration on FN(syn-) chimeric matrix. Thus sequestration or exposure of the FN synergy site within a 3D matrix may represent a novel mechanism for regulating cell functions through differential usage of integrin receptors.
机译:整合素受体介导细胞在纤连蛋白(FN)细胞外基质上的粘附和迁移。整合素5β1和vβ3需要FN中的RGD细胞结合序列,但5β1还需要附近的协同位点以实现最大结合。在这项研究中,我们调查了三维(3D)富含FN的基质中RGD或协同位点数量的差异如何影响细胞粘附和迁移。在含有缺乏RGD的FN(FN(RGD-))的3D嵌合基质上,CHO细胞的粘附,扩散和迁移减少。然而,FN与协同位点(FN(syn-))的突变的掺入导致整联蛋白的选择性使用。表达5β1的CHO细胞显示与FN(syn-)嵌合基质的相互作用降低。相反,FN(syn-)的存在对CHOvβ3细胞迁移没有影响。有趣的是,表达两种整联蛋白的CHO 5 /vβ3细胞选择性地使用5β1在野生型FN基质上迁移,但优选使用vβ3在FN(syn-)嵌合基质上迁移。因此,在3D基质中隔离或暴露FN协同位点可能代表了一种通过整合素受体的不同用法来调节细胞功能的新机制。

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