目的:研究肝癌细胞弹性变化对其表达的整合素分子与配体分子相互作用的影响。方法:以壳聚糖/聚丙烯酰胺水凝胶作为可变基底材料,并将人肝肿瘤细胞(Hep G2)接种到不同软硬度壳聚糖/聚丙烯酰胺水凝胶基底上,利用原子力显微镜力与距离模式...目的:研究肝癌细胞弹性变化对其表达的整合素分子与配体分子相互作用的影响。方法:以壳聚糖/聚丙烯酰胺水凝胶作为可变基底材料,并将人肝肿瘤细胞(Hep G2)接种到不同软硬度壳聚糖/聚丙烯酰胺水凝胶基底上,利用原子力显微镜力与距离模式定量测定不同软硬基底上生长的Hep G2肝瘤细胞膜表面整合素分子与层粘连蛋白分子之间相互作用力。结果:功能化的原子力显微镜探针与不同软硬基底上生长的细胞所产生的粘附情况不相同,细胞生长在培养皿的为对照组;细胞生长在硬度为1000Pa壳聚糖/聚丙烯酰胺水凝胶基底上的为实验组,表达在Hep G2肝瘤细胞膜上的α6β1整合素与其配体层粘连蛋白相互作用力的大小分别为19±7 p N和38.85±19.7 p N。结论:基底软硬度会影响细胞整合素与配体分子间的相互作用。展开更多
Photoaffinity cross-linking is a fast developing technology for biomolecular interactions,including receptor-ligand binding.The chemical mechanisms of the most commonly used photoactivatable probes and their respectiv...Photoaffinity cross-linking is a fast developing technology for biomolecular interactions,including receptor-ligand binding.The chemical mechanisms of the most commonly used photoactivatable probes and their respective photochemistry are summarized.This review focuses on the expanding utilities of this technology as a result of recent advances in the(i)identification of receptor contact sites,(ii)monitoring ligand-induced receptor conformational changes,(iii)identification of global binding surfaces,(iv)binding mode analysis using bifunctional photo-probes,(v)application of biosynthetic photo-probes,and(vi)examples of novel target discovery using this technology.Limitations and future potential of this approach are also discussed.展开更多
文摘目的:研究肝癌细胞弹性变化对其表达的整合素分子与配体分子相互作用的影响。方法:以壳聚糖/聚丙烯酰胺水凝胶作为可变基底材料,并将人肝肿瘤细胞(Hep G2)接种到不同软硬度壳聚糖/聚丙烯酰胺水凝胶基底上,利用原子力显微镜力与距离模式定量测定不同软硬基底上生长的Hep G2肝瘤细胞膜表面整合素分子与层粘连蛋白分子之间相互作用力。结果:功能化的原子力显微镜探针与不同软硬基底上生长的细胞所产生的粘附情况不相同,细胞生长在培养皿的为对照组;细胞生长在硬度为1000Pa壳聚糖/聚丙烯酰胺水凝胶基底上的为实验组,表达在Hep G2肝瘤细胞膜上的α6β1整合素与其配体层粘连蛋白相互作用力的大小分别为19±7 p N和38.85±19.7 p N。结论:基底软硬度会影响细胞整合素与配体分子间的相互作用。
文摘Photoaffinity cross-linking is a fast developing technology for biomolecular interactions,including receptor-ligand binding.The chemical mechanisms of the most commonly used photoactivatable probes and their respective photochemistry are summarized.This review focuses on the expanding utilities of this technology as a result of recent advances in the(i)identification of receptor contact sites,(ii)monitoring ligand-induced receptor conformational changes,(iii)identification of global binding surfaces,(iv)binding mode analysis using bifunctional photo-probes,(v)application of biosynthetic photo-probes,and(vi)examples of novel target discovery using this technology.Limitations and future potential of this approach are also discussed.
