AbstractIntercellular heterogeneity occurs widely under both normal physiological environments and abnormal disease‐causing conditions. Several attempts to couple spatiotemporal information to cell states in a microenvironment were performed to decipher the cause and effect of heterogeneity. Furthermore, spatiotemporal manipulation can be achieved with the use of photocaged/photoactivatable molecules. Here, we provide a platform to spatiotemporally analyze differential protein expression in neighboring cells by multiple photocaged probes coupled with homemade photomasks. We successfully established intercellular heterogeneity (photoactivable ROS trigger) and mapped the targets (directly ROS‐affected cells) and bystanders (surrounding cells), which were further characterized by total proteomic and cysteinomic analysis. Different protein profiles were shown between bystanders and target cells in both total proteome and cysteinome. Our strategy should expand the toolkit of spatiotemporal mapping for elucidating intercellular heterogeneity.
摘要 在正常生理环境和异常致病条件下,细胞间异质性广泛存在。为了破译异质性的原因和影响,人们多次尝试将时空信息与微环境中的细胞状态结合起来。此外,利用光笼/可光电激活的分子可以实现时空操纵。在这里,我们提供了一个平台,通过多个光笼式探针和自制光掩膜,对相邻细胞中不同的蛋白质表达进行时空分析。我们成功地建立了细胞间异质性(可光激活的 ROS 触发器),并绘制了目标(直接受 ROS 影响的细胞)和旁观者(周围的细胞)的图谱。在总蛋白组和半胱氨酸组中,旁观者细胞和目标细胞的蛋白质特征各不相同。我们的策略应能扩展时空图谱工具包,用于阐明细胞间的异质性。