Bifunctional AIE Luminogen for MDR Bacteria Imaging and Killing
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Solution Overview
Problem
Current antibiotics are ineffective against multidrug-resistant (MDR) bacteria due to drug resistance, and photodynamic therapy (PDT) agents often aggregate in physiological conditions, reducing their effectiveness for bacterial treatment and imaging.
Innovation Solution
Development of compounds combining an azole antibiotic unit with an aggregation-induced emission (AIE) unit, such as naphthalimide triazole and triphenylethylene, which act as both antibiotics and AIEgens, generating reactive oxygen species (ROS) upon light exposure to kill bacteria while providing imaging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional photosensitizers are used for photodynamic therapy, then bacteria can be killed through ROS generation, but the PSs aggregate in physiological conditions causing fluorescence quenching and reduced ROS generation
Solution Approach 1:
The patent combines a naphthalimide triazole antibiotic unit with a triphenylethylene AIEgen unit to create a bifunctional compound (TriPE-NT) that exhibits both antibiotic activity and aggregation-induced emission properties. This composite structure prevents the fluorescence quenching and ROS generation loss that occurs with traditional photosensitizers in aggregated states.
2Object-affected harmful factors
If hydrophobic photosensitizers are used, then they can effectively interact with bacteria, but they aggregate in hydrophilic physiological conditions compromising therapy and imaging effects
Solution Approach 1:
The patent modifies the molecular parameters of traditional photosensitizers by incorporating AIEgen units with specific molecular structures (triphenylethylene) that change their aggregation behavior. These compounds remain molecularly dispersed in hydrophilic physiological conditions while maintaining bacterial interaction capability, preventing harmful aggregation.
3Adaptability or versatility
If existing antibiotics are used against MDR bacteria, then they treat common bacterial infections, but they are ineffective against multidrug-resistant strains
Solution Approach 1:
The patent merges the antibiotic function (naphthalimide triazole unit) with the photodynamic therapy function (triphenylethylene AIEgen unit) into a single bifunctional compound. This combination creates a synergistic effect where the compound can kill MDR bacteria through both antibiotic mechanisms and light-induced ROS generation, overcoming drug resistance.
4Ease of manufacture
If mono-functional AIEgens are used for bacterial imaging or killing, then they provide either imaging or antibacterial function, but their antibacterial ability is not systematically investigated and they lack integrated functionality
Solution Approach 1:
The patent designs TriPE-NT as a universal compound that performs multiple functions: it acts as an antibiotic, a fluorescent imaging agent, and a photodynamic therapy agent. This multi-functional design allows a single compound to provide integrated diagnosis and treatment for bacterial infections, including MDR strains.
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 effectively exterminate bacteria through both antibiotic and ROS mechanisms, offering integrated diagnosis and treatment solutions for bacterial infections, including MDR strains, with minimal cytotoxicity to human cells.
Implementation Method 1
Photodynamic therapy (PDT) is a potential alternative to antibiotics for killing bacteria. In general, PDT employs photosensitizers (PSs) to absorb light and generate a single excited state (S1). The S1 state can further transfer the energy to a triplet excited state (T1), which would sensitize the ambient triplet oxygen, resulting in formation of the destructive singlet oxygen or other reactive oxygen species (ROS).
Implementation Method 2
organic luminogens with aggregation-induced emission characteristics (AIEgens) are a kind of molecules showing faint or no emission in solution, but enhanced emission upon aggregation. The unique aggregated lit-up fluorescence characteristic of AIEgens enables their extensive bio-imaging applications.
Data Source
AI summary
Antibiotic compounds having both antibiotic and aggregation-induced emission (AIE) characteristics. The compounds comprise an azole antibiotic unit, for example naphthalimide triazole (NT), and an AIE unit, for example triphenylethylene (TriPE). The compounds act as an effective AIEgen with ROS generating capabilities. The present combinations of an azole antibiotic unit and an AIE unit do not negatively affect the antibacterial properties of the azole. Accordingly, the present compounds exterminate bacteria with both the antibacterial mechanism of the azole along with the ROS produced when the AIE unit is exposed to light. In addition, the intrinsic imagining ability of the present compounds enables them to be used as imaging tools to monitor the drug-bacteria interaction. Collectively, the present compounds provide multiple functions including imaging, monitoring, and bacterial infection inhibition for integrated diagnosis and treatment in clinical practices.