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Lipid deposition has been considered one of the key factors in the occurrence of valvular heart disease (VHD) and a great potential target for the diagnosis of VHD. However, the development of lipid imaging technologies and efficient lipid specific probes is in urgent demand. In this work, we have prepared a lipid droplets (LDs) targeted fluorescence probe CPTM based on a push-pull electronic structure for the imaging of diseased aortic valves. CPTM showed obvious twisted intramolecular charge transfer (TICT) effect and its emission changed from 600 nm in water to 508 nm in oil. CPTM not only exhibited good biocompatibility and high photostability, but also impressive LDs specific imaging performance in human primary valvular interstitial cells and human diseased aortic valves. Moreover, the dynamic changes of intracellular LDs could be monitor in real-time after staining with CPTM. These results were expected to offer new ideals for the designing of novel LDs specific probes for further bioimaging applications.
A lipid droplet activated color switchable probe CPTM with color change from red to green is prepared for the imaging of lipid deposition in human diseased heart valves. [Display omitted]
•A lipid droplet activated color switchable probe CPTM was developed.•CPTM showed obvious AIE effect and lipid enhanced emission.•CPTM could specifically light up intracellular lipid droplets.•Lipid deposition in human diseased aortic valve leaflet could be observed by staining with CPTM.