Biothiol-Activatable Nanoprobe for Glutathione Liver Imaging
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Solution Overview
Problem
The rapid uptake of engineered nanoparticles by the liver's mononuclear phagocyte system (MPS) and glutathione-mediated biotransformation processes complicate nanoparticle transport, disease targeting, and clearance, hindering clinical translation and increasing nanotoxicity, while current imaging techniques lack real-time monitoring of glutathione-mediated detoxification in the liver sinusoid.
Innovation Solution
A thiol-activatable fluorescent nanoprobe, ICG4-GS-Au25 cluster, is designed to bind to serum proteins, allowing non-invasive imaging of glutathione-mediated biotransformation kinetics and altering blood retention and targeting by dissociating in high glutathione concentrations, enhancing liver specificity and minimizing nanotoxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engineered nanoparticles are designed for disease targeting, then they can reach target tissues, but they are rapidly taken up by the liver's mononuclear phagocyte system (MPS), shortening blood retention and inducing nanotoxicity
Solution Approach 1:
The patent changes the chemical parameters of the nanoparticle surface by conjugating thiolated cyclodextrin molecules, which alter the nanoparticle's interaction with serum proteins and liver MPS. This parameter change extends blood retention time while maintaining targeting capability through controlled ligand presentation.
Solution Approach 2:
The patent introduces serum proteins as an intermediary between the nanoparticle and liver MPS. By engineering the nanoparticle surface to interact favorably with serum proteins (forming a protective corona), the nanoparticle is shielded from rapid MPS uptake, thereby extending blood circulation time while still reaching target tissues.
2Stability of the object's composition
If non-degradable nanoparticles composed of toxic elements or heavy metals are used, then they can provide stable imaging and therapy functions, but they induce long-term nanotoxicity due to prolonged body retention
Solution Approach 1:
The patent designs nanoparticles with degradable components that can be safely discarded by the body. The use of biodegradable polymers and metal-free compositions allows the nanoparticle to break down into harmless metabolites that are excreted through renal and hepatic pathways, eliminating long-term toxic accumulation while maintaining functional stability during the therapeutic window.
Solution Approach 2:
The patent replaces permanent, toxic heavy metal nanoparticles with biodegradable, short-lived alternatives. These nanoparticles are designed to fulfill their imaging and therapy functions within a specific time frame and then naturally degrade and excrete, avoiding long-term toxicity while providing sufficient functional stability for clinical application.
3Quantity of substance
If current imaging techniques are used to monitor nanoparticle transport, then general nanoparticle distribution can be observed, but real-time monitoring of glutathione-mediated detoxification in the liver sinusoid cannot be achieved
Solution Approach 1:
The patent incorporates fluorescent probes that undergo color/fluorescence changes in response to glutathione concentration variations. These probes emit different fluorescence intensities or wavelengths when interacting with glutathione in the liver sinusoid, enabling real-time optical monitoring of detoxification processes that were previously undetectable with conventional imaging techniques.
Solution Approach 2:
The patent replaces invasive mechanical biopsy methods with non-invasive optical imaging techniques. By using fluorescent probes and optical detection systems, the patent enables real-time monitoring of glutathione-mediated detoxification without the need for tissue extraction, providing continuous dynamic information about liver function and nanoparticle-biotransformation interactions.
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 ICG4-GS-Au25 cluster effectively targets liver sinusoids, reduces affinity to serum proteins, and enhances nanoparticle clearance, improving liver function imaging and tumor targeting with minimized retention in healthy tissues.
Implementation Method 1
ICG4-GS-Au25 cluster that can bind to serum protein and be transported to the liver
Implementation Method 2
thiol-activatable fluorescent nanoprobe, ICG4-GS-Au25 cluster... dissociating in high glutathione concentrations
Data Source
AI summary
A biothiol-activatable composition is disclosed that is configured to dissociate in the presence of a concentration of biomolecules that are excreted normally by a liver of a living subject comprising a noble metal nanoparticle, a reporter molecule, a linker molecule that is conjugated to the noble metal nanoparticle and to the reporter molecule, but displaceable in the presence of the biomolecules, and wherein the reporter molecule is released in the presence of the biomolecules. The noble nanoparticle is preferably a gold nanoparticle; the reporter molecule preferably comprises at least one of a fluorescent dye molecule, a radioactive molecule or an MRI agent and the linker molecule is preferably a thiol molecule displaceable by biothiols in the liver. In another aspect, the reporter molecule dissociates from the composition in the presence of a concentration of glutathione similar to what is found in liver sinusoids of a normally functioning liver.