A specific dual-locked fluorescence probe to visualize the dynamic changes of lipid droplets and hypochlorous acid in...

Inflammation is a key factor leading to the occurrence and development of many diseases, both lipid droplets (LDs) and hypochlorous acid (HClO/ClO^-) are regarded as the important biomarkers of inflammation. Therefore, it is of great significance to develop an efficient single chemical sensor that can simultaneously detect these two biomarkers. To achieve the goal, we developed a dual-locked fluorescence probe (TPA-DNP) by fusing two targets activated reporting system, its implementation was achieved by turning-on the fluorescence of TPA-DNP through LDs and HClO/ClO^- simultaneously. In simulated LDs environment, TPA-DNP displayed excellent selectivity to HClO/ClO^-, high sensitivity (LOD = 0.527 μM) and strong anti-interference ability. In addition, cell and zebrafish imaging experiments showed that TPA-DNP could be utilized to visualize exogenous/endogenous HClO/ClO^- in LDs environment, and could also be used to observe the impact of LDs changes on the HClO/ClO^- detection. On the basis, TPA-DNP served as a favorable tool to achieve visualization of inflammatory dynamic changes.