The present invention relates to the visualization of acidic organelles based upon organelle enzyme activity. The organelle substrates of the invention are specific for enzyme activity of the organelle and label these organelles, such as lysosomes, rendering them visible and easily observed. Substrates of the present invention include substrates that produce a fluorescent signal. The fluorogenic acidic organelle enzyme substrates of this invention are designed to provide high fluorescence at low pH values and are derivatized to permit membrane permeation through both outer and organelle membranes of intact cells and can be used for staining cells at very low concentrations. They can be used for monitoring enzyme activity in cells at very low concentrations and are not toxic to living cells or tissues.
本发明涉及基于细胞器酶活性的酸性细胞器的可视化。本发明的细胞器底物是特定于细胞器酶活性的,并标记这些细胞器,如溶酶体,使它们可见且易于观察。本发明的底物包括产生荧光信号的底物。本发明的荧光酸性细胞器酶底物旨在在低pH值下提供高荧光,并经过衍生化以允许穿透完整细胞的外部和细胞器膜,并可用于非常低的浓度染色细胞。它们可用于监测细胞中非常低浓度的酶活性,并且对
生物体内的细胞或组织没有毒性。