Three Strategies in Engineering Nanomedicines for Tumor Microenvironment‐Enabled Phototherapy

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 19; no. 37; p. e2300078
• Main Authors: He, Shiliang, Jia, Xiao, Feng, Sai, Hu, Junqing
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.09.2023
• Subjects: Hydrogen peroxide; Hypoxia; Infrared absorption; Nanoparticles; Nanotechnology; Near infrared radiation; Side effects; Tumors; theranostics; tumor microenvironments; photothermal therapies; photodynamic therapies; phototherapies
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202300078

Canonical phototherapeutics have several limitations, including a lack of tumor selectivity, nondiscriminatory phototoxicity, and tumor hypoxia aggravation. The tumor microenvironment (TME) is characterized by hypoxia, acidic pH, and high levels of H 2 O 2 , GSH, and proteases. To overcome the shortcomings of canonical phototherapy and achieve optimal theranostic effects with minimal side effects, unique TME characteristics are employed in the development of phototherapeutic nanomedicines. In this review, the effectiveness of three strategies for developing advanced phototherapeutics based on various TME characteristics is examined. The first strategy involves targeted delivery of phototherapeutics to tumors with the assistance of TME‐induced nanoparticle disassembly or surface modification. The second strategy involves near‐infrared absorption increase‐induced phototherapy activation triggered by TME factors. The third strategy involves enhancing therapeutic efficacy by ameliorating TME. The functionalities, working principles, and significance of the three strategies for various applications are highlighted. Finally, possible challenges and future perspectives for further development are discussed.