Abstract
Fluorescent probes offer incredibly effective tools for visualizing the dynamic morphology of lipid droplets (LDs) and investigating their physiological interactions. In this work, we have utilized solvatochromic coumarin probes bearing nitrile and ester substituents for live-cell imaging. The fluorescence probes are characterized by a donor (diethylamino) and acceptor (nitrile and/or ester) substituents and a rotatable double bond. The designed architecture allows investigation of environmental sensitivity apart from providing excellent ability to target sub-cellular organelles. The synthesized fluorophores showed low cytotoxicity and excellent localization within the lipid droplets. Further, the fluorophores were also utilized to study viscosity changes within the LDs induced by Nystatin. More importantly, we also demonstrate imaging of LDs in multi-cellular animal models such as C. elegans.
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