Department of Next-Generation Applied Science and School of Biopharmaceutical and Medical Sciences, Sungshin University, Seoul 01133, Republic of Korea.
Department of Pharmacology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Republic of Korea.
Anal Chem. 2024 May 28;96(21):8356-8364. doi: 10.1021/acs.analchem.3c05368. Epub 2024 May 16.
Lipids are essential for various cellular functions, including energy storage, membrane flexibility, and signaling molecule production. Maintaining proper lipid levels is important to prevent health problems such as cancer, neurodegenerative disorders, cardiovascular diseases, obesity, and diabetes. Monitoring cellular lipid droplets (LDs) in real-time with high resolution can provide insights into LD-related pathways and diseases owing to the dynamic nature of LDs. Fluorescence-based imaging is widely used for tracking LDs in live cells and animal models. However, the current fluorophores have limitations such as poor photostability and high background staining. Herein, we developed a novel fluorogenic probe based on a push-pull interaction combined with aggregation-induced emission enhancement (AIEE) for dynamic imaging of LDs. Probe exhibits favorable membrane permeability and spectroscopic characteristics, allowing specific imaging of cellular LDs and time-lapse imaging of LD accumulation. This probe can also be used to examine LDs in fruit fly tissues in various metabolic states, serving as a highly versatile and specific tool for dynamic LD imaging in cellular and tissue environments.
脂质对于各种细胞功能至关重要,包括能量储存、膜的柔韧性和信号分子的产生。维持适当的脂质水平对于预防癌症、神经退行性疾病、心血管疾病、肥胖症和糖尿病等健康问题非常重要。由于脂质滴(LDs)的动态性质,实时高分辨率监测细胞中的 LD 可以深入了解 LD 相关途径和疾病。基于荧光的成像技术广泛用于在活细胞和动物模型中追踪 LD。然而,目前的荧光团存在一些局限性,如较差的光稳定性和高背景染色。在这里,我们开发了一种基于推拉相互作用结合聚集诱导发射增强(AIEE)的新型荧光探针,用于 LD 的动态成像。探针 表现出良好的膜透过性和光谱特性,允许对细胞内 LD 进行特异性成像,并对 LD 的积累进行延时成像。该探针还可用于在各种代谢状态下检测果蝇组织中的 LD,是细胞和组织环境中动态 LD 成像的一种非常通用和特异的工具。
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