从肿瘤微环境到亚细胞器:信号驱动的级联靶向与协同干预OA

Poor targeting specificity and low intracellular bioavailability have become key factors restricting the improvement of clinical therapeutic efficacy in tumor treatment.The tumor microenvironment(TME)exhibits characteristics including acidity,hypoxia,overexpression of specific enzymes,and redox imbalance,which provide natural targets for tumor tissue-specific response behavior of nanodrugs.Moreover,the functional homeostasis of subcellular organelles such as mitochondria,lysosomes,endoplasmic reticulum,and nucleus is a core determinant regulating the fate of tumor cells.This paper focuses on the signal-driven cascade targeting strategy,which takes TME characteristic signals as the primary trigger to help nanodrugs overcome in vivo physiological barriers and achieve specific responses in tumor tissues.Subsequently,cascade reactions expose organelle-targeting moieties,and secondary precise localization is realized by virtue of the microenvironmental differences between subcellular organelles and cytosol,thereby achieving specific intervention in subcellular organelle functions.This study systematically summarizes the design principles of cascade targeting driven by acidic,enzymatic,redox,and hypoxic signals,with a focus on the application pathways of core mechanisms(e.g.,charge reversal,structural conformation change,and prodrug activation)in subcellular organelle precision therapy,as well as the synergistic potential of this strategy to ameliorate tumor therapy resistance and remodel the tumor immune microenvironment.This work aims to provide a theoretical reference for the development of intelligent nanodrugs and precise tumor therapy.