Recent progress in organelle-targeting fluorescent probes for the detection of peroxynitrite.

Peroxynitrite (ONOO), as an important reactive nitrogen species, plays a pivotal role in the regulation of intracellular redox homeostasis, signal transduction, cell growth and metabolism, and other physiological processes. Organelles are important for regulating ONOO, and the dysregulation of ONOO in organelles is closely related to various diseases. Therefore, it is essential to monitor ONOO in cellular organelles, including mitochondria, lysosome, endoplasmic reticulum (ER), Golgi apparatus, and lipid droplets. However, the latest advances in organelle-targeting ONOO fluorescent probes have not been reviewed systematically. In this review, we focus on the design, sensing mechanism, and organelle-targeting imaging applications of ONOO fluorescent probes that were reported since 2018. This review will help to facilitate the comprehension of organelle-targeting fluorescent probes for the detection of ONOO.