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针对抗血管原治疗的整合素α5向抗体的结构和功能特征

Adam Nguyen^1,2, Joel B Heim^3,4,5, Gabriele Cordara⁴

¹Basic Sciences Division, Fred Hutchinson Cancer Center, Seattle, Washington 98109, USA.

bioRxiv : the preprint server for biology

|January 20, 2025

概括

针对整合素α5β1 (纤维肌菌素受体) 的两种抗体通过减少血管生成和瘤生长,显示出治疗潜力. 它们独特的结构效应为设计未来的整合素向药物提供了洞察力,提高了疗效,减少了非向效应.

科学领域:

生物化学生物化学
细胞生物学细胞生物学
免疫学免疫学免疫学

背景情况:

整体素,如α5β1 (纤维蛋白受体),对于细胞粘附和信号传递至关重要,调解血管生成.
α5β1整合素的失调与瘤生长和转移有关.
目前的α5β1向疗法面临有效性和非向效应的挑战,原因是不完全理解整合素构成动态.

研究的目的:

描述两种抗α5β1抗体,BIIG2和MINT1526A,其治疗潜力和对整合素构成的机制作用.
为了阐明抗体和α5β1整体之间的分子相互作用.
为设计改进的整体向治疗提供洞察力.

主要方法:

细胞生物学测试以评估血管生成抑制.
生物物理方法来确定抗体结合亲和力.
电子显微镜绘制抗体-整合素接口的地图.
使用异种移植小鼠模型进行体内研究,以评估瘤生长减少.

主要成果:

两种BIIG2和MINT1526A抗体都与纳米分子亲和力结合α5β1整体素,并在体外抑制血管生成.
BIIG2在异种移植模型中显示出显著的瘤生长减少以及对纤维细胞和黑色素瘤细胞的特异性.
电子显微镜揭示了纤维素结合的重叠表位和硬质障碍,但对α5β1的形状灵活性有不同的影响:MINT1526A的灵活性受到约束,而BIIG2则没有.

结论:

BIIG2和MINT1526A抗体通过硬质阻碍抑制α5β1介导的血管生成和纤维素结合.
对整体形态状态的明显影响凸显了在治疗设计中形态动态的重要性.
了解这些机制上的差异是开发未来α5β1向药物的关键,这些药物具有增强的疗效和最小化的非向效应.

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