Metal-Based Coordination Complexes for Hypoxic Photodynamic Therapy
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Solution Overview
Problem
There is a need for new photodynamic compounds (PDCs) that can effectively treat diseases caused by hyperproliferating cells, such as cancer, and function as both therapeutic and diagnostic agents, particularly those that can be activated by light in various environments, including hypoxic conditions, and are capable of inducing apoptosis and DNA crosslinking.
Innovation Solution
Development of novel metal-based coordination complexes derived from organic ligands, specifically tunable compounds that include osmium, manganese, molybdenum, rhenium, ruthenium, rhodium, iridium, nickel, and platinum, which can absorb UV-IR light, including near-infrared, to destroy hyperproliferative cells, microbial cells, and viruses, and function as DNA binding agents, photocleavage agents, and photosensitizers capable of Type I and Type II photoprocesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional organic-based porphyrins are used as photodynamic compounds, then they can provide photosensitizing activity, but they have limitations in effectiveness under hypoxic conditions and lack disease-modifying properties
Solution Approach 1:
The patent employs metal-based coordination complexes that combine metal centers (Ru, Rh, Ir, Os, Pt) with organic ligands to create composite photodynamic compounds. These composite structures integrate the photosensitizing properties of organic ligands with the catalytic and stability properties of metal centers, enabling effective operation under hypoxic conditions through alternative photoprocesses (Type I mechanisms) while providing disease-modifying effects through DNA binding and crosslinking capabilities.
Solution Approach 2:
The patent utilizes metal-based coordination complexes that can undergo photoprocesses independent of oxygen concentration (Type I mechanisms involving radical species), fundamentally changing the operational parameters from oxygen-dependent (Type II) to oxygen-independent pathways. This parameter change enables reliable photodynamic activity under hypoxic conditions where traditional porphyrins fail.
2Adaptability or versatility
If photodynamic compounds are designed to function in various oxygen conditions, then they can treat hypoxic tumors, but they require complex metal-based coordination structures
Solution Approach 1:
The metal-based coordination complexes are designed to perform multiple functions: photosensitizing under both normoxic and hypoxic conditions, DNA binding, DNA crosslinking, and photocleavage. This multi-functionality is achieved through the versatile coordination chemistry of transition metals that can engage in both photoprocesses and direct biological interactions, reducing the need for separate therapeutic mechanisms.
Solution Approach 2:
The coordination complexes combine metal centers with tailored organic ligands to create composite structures that integrate photosensitizing, DNA-binding, and crosslinking functionalities into a single molecular entity, achieving versatility without requiring multiple separate compounds.
3Adaptability or versatility
If photodynamic compounds induce DNA crosslinking and apoptosis, then they provide disease-modifying effects, but they may increase toxicity to normal cells
Solution Approach 1:
The metal-based coordination complexes bind to DNA and form stable complexes before light activation. This preliminary binding localizes the photodynamic activity specifically at the DNA location, ensuring that upon light irradiation, the photochemical reactions (crosslinking, cleavage) occur only where the complex is bound, thereby protecting normal cells from off-target toxicity while maintaining disease-modifying effects in target cells.
Solution Approach 2:
The metal-based coordination complexes act as intermediaries that mediate between light energy and DNA. They absorb light and transfer energy to produce reactive species or directly induce photochemical changes in DNA, providing a controlled and localized mechanism for disease modification that reduces uncontrolled toxicity to normal tissues.
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
These compounds demonstrate high stability, effectiveness in photodynamic therapy (PDT) under different oxygen conditions, inducing cell death in cancer cells and bacteria, and show promise as both therapeutic and diagnostic agents, with potential for in vivo applications.
Implementation Method 1
The photodynamic compounds can be activated with ultraviolet to infrared (UV-IR) light, particularly near infrared light... The photodynamic compounds can be activated by light to destroy unwanted cells
Implementation Method 2
The compounds are useful as DNA binding agents... inducing cell death in cancer cells and bacteria
Implementation Method 3
The compounds are useful as photocleavage agents... capable of Type I and Type II photoprocesses
Data Source
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AI summary
Compositions of the invention include metal-based coordination complexes, which are preferably tunable photodynamic compounds. The compositions and complexes are useful as therapeutic agents and as in vivo diagnostic agents for treating or preventing diseases including those that involve hyperproliferating cells in their etiology, such as cancer. Compositions and complexes of the invention are further capable of destroying microbial cells, such as bacteria, fungi, and protozoa, and destroying viruses. The compositions and complexes are also capable of modulating cell function in other ways.