Metal-Organic Nanoplates for X-Ray Induced Photodynamic Therapy
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Solution Overview
Problem
Current photodynamic therapy (PDT) and radiotherapy (RT) methods face limitations in efficacy and specificity due to suboptimal tumor accumulation of photosensitizers and toxic effects on normal tissues, with a need for compositions and methods to enhance their efficiency and combine them with other treatment modalities like chemotherapy and immunotherapy.
Innovation Solution
Development of metal-organic layers (MOLs) and metal-organic nanoplates (MOPs) comprising periodic repeats of metal-based secondary building units and organic bridging ligands, where the MOLs or MOPs include a photosensitizer and a metal ion capable of absorbing X-rays, such as Hf, lanthanides, or other high-Z elements, facilitating X-ray induced PDT and RT-RDT, and can be combined with immunotherapy agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photosensitizers are administered systemically for photodynamic therapy, then tumor treatment capability is improved, but tumor accumulation efficiency deteriorates
Solution Approach 1:
The patent uses metal-organic framework composite materials that combine photosensitizers with metal ions (high-Z elements) to create a unified therapeutic agent. This composite structure enables simultaneous tumor targeting, X-ray absorption enhancement, and photosensitizing function, resolving the contradiction between systemic administration and tumor accumulation efficiency.
Solution Approach 2:
The patent modifies the physical and chemical parameters of photosensitizers by incorporating them into metal-organic frameworks with specific pore sizes, surface areas, and stability characteristics. These parameter changes enable enhanced tumor accumulation through EPR effect while maintaining systemic administrability.
2Reliability
If radiotherapy is used to treat cancer, then deep-seated tumor treatment capability is improved, but toxicity to normal tissues worsens
Solution Approach 1:
The patent merges radiotherapy with photodynamic therapy in a single metal-organic framework system. The high-Z metal ions enhance X-ray absorption locally at the tumor site, while photosensitizers generate ROS upon X-ray activation. This combination delivers enhanced radiation therapy precisely to tumors with minimal damage to surrounding normal tissues.
Solution Approach 2:
The metal-organic framework concentrates high-Z metal ions and photosensitizers specifically at the tumor site through passive and active targeting mechanisms. This local concentration ensures that X-ray enhancement and ROS generation occur predominantly in the tumor region, reducing toxicity to normal tissues while maintaining deep-seated tumor treatment capability.
3Reliability
If high-Z metal ions are incorporated to enhance X-ray absorption, then radiotherapy efficacy is improved, but device complexity worsens
Solution Approach 1:
The metal-organic framework serves multiple functions simultaneously: it acts as a carrier for photosensitizers, provides X-ray absorption enhancement through high-Z metal ions, enables tumor targeting, and facilitates controlled drug release. This multi-functionality consolidates what would otherwise require multiple separate components into a single unified system, managing complexity while enhancing radiotherapy efficacy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The MOLs and MOPs enable efficient generation of reactive oxygen species, providing enhanced anticancer efficacy with improved tumor targeting and reduced toxicity, allowing for effective treatment of various cancers, including deep-seated tumors, while combining with immunotherapy for systemic tumor rejection.
Implementation Method 1
one or more of the SBUs comprise a metal ion capable of absorbing x-rays
Implementation Method 2
PDT involves the administration of a tumor-localizing photosensitizer (PS) followed by light activation to generate highly cytotoxic reactive oxygen species (ROS)
Implementation Method 3
followed by light activation to generate highly cytotoxic reactive oxygen species (ROS), particularly singlet oxygen (1O2), which trigger cell apoptosis and necrosis
Data Source
AI summary
Metal-organic layers (MOLs) and metal-organic nanoplates (MOPs) comprising photosensitizers are described. The MOLs and MOPs can also include moieties capable of absorbing X-rays or other ionizing irradiation energy and/or scintillation. Optionally, the photo sensitizer or a derivative thereof can form a bridging ligand of the MOL or MOP. Also described are methods of using MOLs and MOPs in photodynamic therapy, X-ray induced photodynamic therapy (X-PDT), radiotherapy (RT), radiodynamic therapy, or in radiotherapy-radiodynamic therapy (RT-RDT), either with or without the co-administration of another therapeutic agent, such as a chemotherapeutic agent or an immunomodulator.