Nanoscale Metal-Organic Frameworks: An Emerging Versatile Tool for Next-Generation Photodynamic Therapy

Area of Science:

• Biomedical Engineering
• Materials Science
• Oncology

Background:

• Photodynamic therapy (PDT) offers non-invasive cancer treatment but faces challenges including photosensitizer aggregation, tumor hypoxia, and limited light penetration.
• Nanoscale metal-organic frameworks (NMOFs) present tunable properties and high porosity, making them suitable carriers for photosensitizers.

Purpose of the Study:

• To review recent advancements in NMOFs for enhancing PDT effectiveness in the tumor microenvironment.
• To explore strategies addressing tumor hypoxia and light penetration depth limitations.
• To discuss targeting strategies for improved photosensitizer delivery and efficacy.

Main Methods:

• Review of literature on NMOF design strategies for PDT.
• Analysis of approaches to mitigate tumor hypoxia and improve light penetration.
• Examination of targeting mechanisms like stimulus-activated release and sub-cellular internalization.

Main Results:

• NMOFs can be engineered to overcome PDT limitations by improving photosensitizer loading, tumor accumulation, and penetration depth.
• Strategies exist to enhance NMOF performance in hypoxic tumor environments and with various light sources.
• Targeting strategies improve therapeutic outcomes through controlled photosensitizer release and uptake.

Conclusions:

• NMOFs are highly promising for improving PDT efficacy by addressing key challenges in the tumor microenvironment.
• Further research into NMOF design and targeting is crucial for realizing their full therapeutic potential.
• NMOFs offer a versatile platform for advanced cancer therapy with enhanced permeability and retention effects.