清华大学最新Cell论文：米达/郭增才合作开发胚胎小鼠活体成像技术，实时直播胚胎大脑发育

Core Viewpoint - The article discusses a groundbreaking technology developed by Tsinghua University, known as IMEE, which allows for long-term observation of cellular interactions in the developing mammalian brain, providing new insights into brain development and potential implications for understanding neurodevelopmental disorders [2][3]. Group 1: IMEE Technology Overview - IMEE (intravital imaging of externally immobilized embryos) is a high-stability, multi-angle, long-duration imaging technique that enables the observation of dynamic interactions between inhibitory neurons, blood vessels, and microglia in the embryonic mouse brain [3]. - This technology overcomes previous limitations in live imaging of embryonic neural development, allowing for continuous observation of mouse embryos from E10.5 to E16.5 for over 8 hours without affecting normal development [8]. Group 2: Neuronal Migration Patterns - The research team observed different migration patterns of excitatory neurons in the embryonic brain, including multipolar migration, locomotion, and somal translocation, with notable differences in switching speeds between these modes [10]. - Inhibitory neurons exhibited complex migration behaviors, taking two main pathways: the marginal zone (MZ) with random movement and the subventricular zone (SVZ) with organized directional movement [11]. Group 3: Cellular Interactions - Neurons interact frequently with surrounding cells during migration, establishing three types of contacts with the vascular system, which significantly affect their migration speed and direction [13]. - The study highlights the role of the EphA4/ephrinB signaling pathway in regulating neuron-vascular interactions, where disruption of this pathway leads to abnormal behaviors in neurons [13]. Group 4: Microglial Function - Microglia, the brain's resident immune cells, begin their protective roles during the embryonic stage, with two types identified based on their relationship with blood vessels: vascular-associated microglia (CAM) and parenchymal microglia (PCM) [15]. - Upon brain injury, microglia migrate towards the damage site at an average speed of 2.3 μm/min, with a maximum speed of 10.8 μm/min, demonstrating their active role in immune response and repair [15]. Group 5: Future Research Implications - IMEE technology not only addresses critical issues in neurodevelopment research but also serves as a powerful platform for future studies, compatible with various genetic markers and manipulation tools [19]. - This advancement opens new avenues for real-time observation of how genetic and environmental factors influence brain development, potentially aiding in early diagnosis and intervention of related diseases [19].