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An Aurone Derivative Revealing the Metabolism of Lipid Droplets and Monitoring Oxidative Stress in Living Cells.

Lipid droplets (LDs) are closely connected with many physiological processes and abnormal LDs are related to many diseases. Herein, a family of two-photon fluorescence compounds based on the aurone skeleton were developed as efficient LDs imaging probes. They exhibit the obvious solvatochromism effect from blue to orange emission (~140 nm shift) in various solvents. The robust probes possess low toxicity to living cells, high photobleaching resistance and superior photostability and can light up LDs with high specificity. Furthermore, the probe DMMB was carefully applied in real-time monitoring the morphological changes of LDs and the interactions between LDs and mitochondria under specific physiological conditions (e.g. starvation). We have observed for the first time the dynamic change between mitochondria and LDs when mitochondrial damage is caused by a large excess of H2O2 in a short time.