首页> 美国卫生研究院文献>Journal of the Boston Society of Medical Sciences >The α1β1 and α2β1 Integrins Provide Critical Support for Vascular Endothelial Growth Factor Signaling Endothelial Cell Migration and Tumor Angiogenesis
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The α1β1 and α2β1 Integrins Provide Critical Support for Vascular Endothelial Growth Factor Signaling Endothelial Cell Migration and Tumor Angiogenesis

机译:α1β1和α2β1整合素为血管内皮生长因子信号转导内皮细胞迁移和肿瘤血管生成提供关键支持

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摘要

Angiogenesis is a complex process, involving functional cooperativity between cytokines and endothelial cell (EC) surface integrins. In this study, we investigated the mechanisms through which the α1β1 and α2β1 integrins support angiogenesis driven by vascular endothelial growth factor (VEGF). Dermal microvascular EC attachment through either α1β1 or α2β1 supported robust VEGF activation of the Erk1/Erk2 (p44/42) mitogen-activated protein kinase signal transduction pathway that drives EC proliferation. Haptotactic EC migration toward collagen I was dependent on α1β1 and α2β1 as was VEGF-stimulated chemotaxis of ECs in a uniform collagen matrix. Consistent with the functions of α1β1 and α2β1 in supporting signal transduction and EC migration, antibody antagonism of either integrin resulted in potent inhibition of VEGF-driven angiogenesis in mouse skin. Moreover, combined antagonism of α1β1 and α2β1 substantially reduced tumor growth and angiogenesis of human squamous cell carcinoma xenografts. Collectively, these studies identify critical collaborative functions for the α1β1 and α2β1 integrins in supporting VEGF signal transduction, EC migration, and tumor angiogenesis.
机译:血管生成是一个复杂的过程,涉及细胞因子与内皮细胞(EC)表面整合素之间的功能性协同作用。在这项研究中,我们研究了α1β1和α2β1整合素支持由血管内皮生长因子(VEGF)驱动的血管生成的机制。通过α1β1或α2β1引起的皮肤微血管EC附着支持Erk1 / Erk2(p44 / 42)丝裂原激活的蛋白激酶信号转导途径的强劲VEGF激活,从而驱动EC增殖。趋向EC向胶原蛋白I的迁移依赖于α1β1和α2β1,在均匀胶原蛋白基质中VEGF刺激EC的趋化性也一样。与α1β1和α2β1在支持信号转导和EC迁移中的功能一致,任一种整联蛋白的抗体拮抗作用均能有效抑制小鼠皮肤中VEGF驱动的血管生成。此外,α 1 β 1 和α 2 β 1 的联合拮抗作用大大降低了人类的肿瘤生长和血管生成鳞状细胞癌异种移植。这些研究共同确定了α 1 β 1 和α 2 β 1 整合素在支持中的关键协作功能VEGF信号转导,EC迁移和肿瘤血管生成。

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