Activity-Based Probe for Enzyme Localization via Signal Amplification
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Solution Overview
Problem
Current X-ray computed tomography (CT) imaging techniques suffer from low sensitivity, making it difficult to accurately detect and localize specific enzymes like proteases within tissues, which are often associated with pathological conditions.
Innovation Solution
Development of novel compounds with multiple CT imaging moieties and an enzyme-interacting moiety, specifically designed to bind to proteases such as cathepsin, using solid and solution phase chemistries to enhance sensitivity and cell permeability, allowing for accurate localization of target enzymes through amplified imaging signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CT imaging is used, then the imaging process is simple and non-invasive, but the sensitivity is low and cannot accurately detect specific enzymes within tissues
Solution Approach 1:
The patent introduces activity-based probes as intermediary molecules that bind to target enzymes (proteases) within tissues. These probes serve as mediators between the CT imaging system and the target enzymes, concentrating the imaging signal at specific locations where the enzymes are present, thereby enhancing detection sensitivity without requiring complex imaging hardware modifications
Solution Approach 2:
The patent modifies the imaging parameter by incorporating multiple CT imaging moieties (such as iodine-based contrast agents) onto the probe molecules. This changes the radiodensity parameter of the probe, enabling it to generate a detectable CT signal that amplifies the visualization of target enzyme locations, thus improving measurement precision while maintaining relatively simple imaging equipment
2Measurement precision
If multiple CT imaging moieties are added to a single compound to enhance signal, then the imaging sensitivity improves, but the compound size and complexity increase
Solution Approach 1:
The patent segments the probe molecule into distinct functional modules: a carrier moiety (such as a dendrimer or nanoparticle core), multiple CT imaging moieties attached to the carrier, and enzyme-interacting moieties. This segmentation allows independent optimization of each component's function while managing overall molecular size and complexity through modular assembly
Solution Approach 2:
The patent employs composite material strategies by combining different types of moieties (carrier, imaging, and enzyme-interacting) into a hybrid probe structure. This composite approach enables the integration of multiple functions—signal generation, enzyme targeting, and cellular penetration—within a single compound, achieving enhanced imaging sensitivity while controlling structural complexity through deliberate design
3Ease of operation
If the compound size is reduced to improve cell penetration, then cellular uptake improves, but the ability to carry multiple imaging moieties and generate detectable CT signal is compromised
Solution Approach 1:
The patent resolves the size-signal contradiction by transitioning to a different dimensional approach: using nanoparticle carriers (0.01-100 nm) that provide sufficient surface area for attaching multiple imaging moieties while maintaining small enough dimensions to penetrate cells effectively. This dimensional optimization allows the probe to carry multiple CT imaging moieties for detectable signal generation while preserving cell permeability through appropriate size control
4Measurement precision
If the probe is designed to specifically bind to proteases, then the localization accuracy improves, but the probe may interact with other enzyme targets reducing specificity
Solution Approach 1:
The patent applies local quality by designing enzyme-interacting moieties with specific chemical structures (such as acyloxymethyl ketone or phosphonate groups) that are selectively recognized by particular protease families. This localized chemical specificity ensures the probe binds to the intended target enzymes (e.g., cathepsins) while minimizing off-target interactions, thereby maintaining high localization accuracy and probe reliability
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 compounds enable precise detection and localization of proteases, providing an effective diagnostic tool for pathologies associated with increased enzyme expression, such as cancer and inflammatory diseases, by enhancing the CT signal and improving tissue penetration.
Implementation Method 1
compounds that comprise an X-ray computed tomography (CT)-imaging moiety... enabling detection of the CT signal
Data Source
AI summary
Provided is a compound including at least one carrier moiety associated with a plurality of CT imaging moieties, and with at least one enzyme interacting moiety as well as uses thereof in diagnosis.