中文摘要：

聚集诱导发光效应（AIE）在荧光传感、生物成像领域具有广阔的应用前景．近红外发射的荧光染料具有组织穿透性高、细胞低损伤，以及生物组织自荧光干扰小等优点．设计并合成了一种荧光增强型的AIE荧光体系DTPE—Tau；其具有近红外荧光发射特性，且细胞摄取能力强；并在炎症细胞中过度表达的酯酶的催化下，能有效清除细胞中过度表达的活性氧簇（ROS）．此外，该荧光体系还具有许多优势，例如斯托克斯位移大、细胞毒性低和光稳定性好．DTPE—Tau被成功地应用于活细胞中追踪牛磺酸的释放和活性氧的清除．

英文摘要：

Fluorophores with aggregation-induced emission （AIE） feature are favorable tools for both chemical sensing and bioimaging. Inflammatory cells excessively express hydrolytic enzymes （esterase, protease and phosphatase） and are usually exposed to elevated levels of reactive oxygen species （ROS）. Overexpression of ROS and the insufficient neutralization by antioxidants may give rise to the development of oxidative stress and chronic inflammation. Taurine （2-aminoethanesulfonic acid）, as an effective antioxidant, can protect tissues from oxidative stress associated with various inflammatory diseases. Moreover, it has been recently reported that the incorporation of taurine can amazingly boost the cellular uptake for intracel- lular accumulation. Herein, we designed and synthesized a new near-infrared （NIR） AIE fluorophore DTPE. We anticipate that, the combination of the hydrophitic taurine with the NIR AIE fluorophore through an ester bond could be a remarkable method for extending the applications of AIE-active fluorophores e.g. as a trackable visualized therapeutic system featuring both imaging esterase-activated taurine release and ROS scavenging. Then we obtained the AIE probe system DTPE-Tau by incorporating taurine with the fluorophore through carbamate bond. The hydrophilic taurine moiety endows the system with enhanced water solubility and cellular uptake ability. The system is characterized by several advantages, such as large Stokes shift （225 nm）, low cytotoxicity, and good photostability. The ester bond can be hydrolysed by the overexpressed esterase in inflammatory cells, thereby releasing a taurine moiety for ROS scavenging and in the meantime the AIE fluorophore moiety acts as a reporter for tracking esterase-activated taurine release. The enhancement of emission could serve as the reporting signal. The release rate is determined to be 75% for esterase at 0.05 mg/mL, calculated based on the fluorescence-intensity working curve. Also, the probe has been successfully utilized for