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Harnessing photo-chemoresponse for precise drug activation
Xing Zhang1, Junjie Ding1, Dihua Tian2
1College of Science, Co-Innovation Center for Sustainable Forestry in Southern China, College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China.
Abstract:
Photo-chemoresponsive controlled drug delivery enables spatiotemporally precise interventions by transducing optical stimuli into defined drug activation events, overcoming the inability of conventional formulations to synchronize therapeutic action with disease dynamics. Covalent prodrug strategies utilizing photoresponsive protecting groups or coordinating ligands offer distinct advantages over physical encapsulation by ensuring exceptional chemical selectivity and pharmacological fidelity, thereby confining activation to illuminated lesions while mitigating off-target toxicity and acquired resistance. This review systematically examines the molecular design principles underlying six key photochemical mechanisms, including photoreduction, photocleavage, photoactivated ligand effects, photodynamic action, photothermal conversion, and synergistic pathways. Furthermore, we critically evaluate recent advances in the engineering of photo-chemoresponsive prodrugs, together with their inherent limitations and translational challenges, and discuss future directions for clinical implementation. By providing a comprehensive overview of these mechanisms and strategies, this review serves as a valuable reference for the rational design of next-generation precision phototherapeutics.
Insights
Photo-chemoresponsive drug delivery uses light to precisely activate medications, improving treatment accuracy and reducing side effects. This review explores advanced prodrug strategies for targeted therapies.
Area of Science:
- Biomedical Engineering
- Materials Science
- Pharmacology
Background:
- Conventional drug delivery struggles with precise timing and location of therapeutic action.
- Photo-chemoresponsive systems offer spatiotemporal control by converting optical stimuli into drug activation.
- Covalent prodrugs provide superior chemical selectivity and pharmacological fidelity compared to physical encapsulation.
Purpose of the Study:
- To systematically review molecular design principles of photo-chemoresponsive prodrugs.
- To examine six key photochemical mechanisms for drug activation.
- To evaluate recent advances, limitations, and translational challenges in this field.
Main Methods:
- Review of literature on photo-chemoresponsive prodrugs and photochemical mechanisms.
- Analysis of molecular design strategies for controlled drug release.
- Critical evaluation of existing prodrug systems and their clinical applicability.
Main Results:
- Six primary photochemical mechanisms were identified: photoreduction, photocleavage, photoactivated ligand effects, photodynamic action, photothermal conversion, and synergistic pathways.
- Covalent prodrugs demonstrate significant advantages in targeted activation and reduced off-target toxicity.
- Recent engineering efforts have advanced the development of these sophisticated therapeutic agents.
Conclusions:
- Photo-chemoresponsive prodrugs represent a promising frontier for precision medicine.
- Understanding photochemical mechanisms is crucial for rational design of next-generation phototherapeutics.
- Further research addressing translational challenges is needed for clinical implementation.
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