A Novel Single-Molecule Fluorescence Lifetime Probe for Apoptosis Diagnosis Through Mitochondrial SO 2 and DNA Co-Detection

作者：Hong Wang, Tong Zhu, Wanying Li, Zhangjun Hu, Xin Yang, Qiong Zhang, Peng Huang, Jiwen Hu, Zhihui Feng · 发表于：Analytical Chemistry · 年份：2025 · DOI：10.1021/acs.analchem.5c02360 · 被引用次数：6 · 研究领域：Sulfur Compounds in Biology、Redox biology and oxidative stress、Molecular Sensors and Ion Detection

As a key signaling molecule, sulfur dioxide (SO 2 ) plays a crucial role in maintaining physiological homeostasis. In this work, we designed a mitochondria-targeted fluorescent probe (MIC) for independently detect SO 2 (short-wavelength) and DNA (long-wavelength) in real time. It is worth noting that our research reveals a dual role of that SO 2 in regulating oxidative stress. At appropriate levels, it acts as a modulator, whereas excessive amounts induce apoptosis by reducing mitochondrial membrane potential, upregulating p53/Bax, downregulating Bcl-2, and activating the caspase-3 cascade. The apoptotic process induces mitochondrial membrane permeability changes, triggering the release and nuclear translocation of the probe MIC, which subsequently emits red fluorescence. Using time-resolved fluorescence imaging technology, we further observed a significant increase in the average fluorescence lifetime of the DNA channel. This finding demonstrates that the MIC probe not only enables dual-channel monitoring of mitochondrial SO 2 and nuclear DNA but also precisely evaluates the apoptotic process through changes in fluorescence lifetime. This innovative tool provides an important means for in-depth study of the SO 2 -mediated apoptotic mechanism and opens up new strategies for the diagnosis of mitochondrial-related diseases.