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修改L-选择素粘附的机械性质和剪切值,独立于平衡性质
K D Puri1, S Chen, T A Springer
1The Center for Blood Research and Harvard Medical School, Department of Pathology, Boston, Massachusetts 02115, USA.
Nature
|May 15, 1998
概括
研究人员用化学方法修改了一个连接体,以改变细胞粘附分子键的机械性质. 这种修改改变了强力如何影响键强度,为细胞与细胞相互作用和淋巴细胞贩运提供了新的见解.
科学领域:
- 细胞生物物理学 细胞生物物理学
- 分子免疫学分子免疫学
- 生物化学 生物化学
背景情况:
- 细胞粘附分子相互作用对于细胞贩运至关重要,但受到施加力的影响.
- 这些键的机械性质,不同于亲和力,会影响它们在力下的强度.
- 之前的研究缺乏实验方法来改变这些机械性能.
研究的目的:
- 为了研究机械性质在粘附分子相互作用中的作用.
- 实验性地修改特定细胞粘附键的机械特性.
- 了解这些修改如何影响L-选择素介导的细胞粘附.
主要方法:
- 选择性和可逆化学修饰一种类似素的配体.
- 在不同的力条件下对L-选择素和改性联结体相互作用的分析.
- 测量带有和没有施加武力的债券分离率.
主要成果:
- 化学修饰改变了L-选择因键的机械性质.
- 取决于力量的解离动力学发生了显著的变化,而基底解离在很大程度上不受影响.
- 在L-selectin相互作用中,对水力动力学剪流的值要求发生了显著的改变.
结论:
- 粘附分子键强度受到机械性质的显著影响,而不仅仅是亲和力.
- 准机械性质为调节细胞粘附提供了一种新的方法.
- 这项研究提供了一种新的工具,用于在生理和病理上下文中探测和操纵细胞与细胞相互作用.
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